Merge branch 'master' into es6arrows

# Conflicts:
#	mocha_test/autoInject.js

83 files changed, 5282 insertions, 5158 deletions

diff --git a/.travis.yml b/.travis.yml
index a866e55..9feb56a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ node_js:
   - "0.10"
   - "0.12"
   - "4"
-  - "5"
+  - "6"
 sudo: false
 after_success: npm run coveralls
 
diff --git a/Makefile b/Makefile
index 6e09554..5104ce8 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ DIST = dist
 SRC = lib/index.js
 SCRIPTS = ./support
 JS_SRC = $(shell find lib/ -type f -name '*.js')
-LINT_FILES = lib/ test/ mocha_test/ $(shell find perf/ -maxdepth 2 -type f) support/ karma.conf.js
+LINT_FILES = lib/ mocha_test/ $(shell find perf/ -maxdepth 2 -type f) support/ karma.conf.js
 
 UMD_BUNDLE = $(BUILDDIR)/dist/async.js
 UMD_BUNDLE_MIN = $(BUILDDIR)/dist/async.min.js
@@ -120,5 +120,5 @@ release-major release-minor release-patch release-prerelease: all
 	# build again to propagate the version
 	$(MAKE) build-config
 	$(MAKE) build-es-config
-	cd build/ && npm pack
-	cd build-es/ && npm pack
+	cd build/ && npm publish
+	cd build-es/ && npm publish
diff --git a/README.md b/README.md
index e7a4c1a..0e34285 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Async.js
 
 [![Build Status via Travis CI](https://travis-ci.org/caolan/async.svg?branch=master)](https://travis-ci.org/caolan/async)
-[![NPM version](http://img.shields.io/npm/v/async.svg)](https://www.npmjs.org/package/async)
+[![NPM version](https://img.shields.io/npm/v/async.svg)](https://www.npmjs.com/package/async)
 [![Coverage Status](https://coveralls.io/repos/caolan/async/badge.svg?branch=master)](https://coveralls.io/r/caolan/async?branch=master)
 [![Join the chat at https://gitter.im/caolan/async](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/caolan/async?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
@@ -9,13 +9,13 @@
 
 Async is a utility module which provides straight-forward, powerful functions
 for working with asynchronous JavaScript. Although originally designed for
-use with [Node.js](http://nodejs.org) and installable via `npm install --save async`,
+use with [Node.js](https://nodejs.org/) and installable via `npm install --save async`,
 it can also be used directly in the browser.
 
 Async is also installable via:
 
 - [bower](http://bower.io/): `bower install async`
-- [component](https://github.com/component/component): `component install caolan/async`
+- [component](https://github.com/componentjs/component): `component install caolan/async`
 - [jam](http://jamjs.org/): `jam install async`
 
 Async provides around 70 functions that include the usual 'functional'
@@ -221,6 +221,7 @@ Some functions are also available in the following forms:
 * [`filter`](#filter), `filterSeries`, `filterLimit`
 * [`reject`](#reject), `rejectSeries`, `rejectLimit`
 * [`reduce`](#reduce), [`reduceRight`](#reduceRight)
+* [`transform`](#transform)
 * [`detect`](#detect), `detectSeries`, `detectLimit`
 * [`sortBy`](#sortBy)
 * [`some`](#some), `someLimit`, `someSeries`
@@ -442,8 +443,7 @@ __Arguments__
 
 * `coll` - A collection to iterate over.
 * `iteratee(item, callback)` - A truth test to apply to each item in `coll`.
-  The `iteratee` is passed a `callback(err, truthValue)`, which must be called with a
-  boolean argument once it has completed.
+  The `iteratee` is passed a `callback(err, truthValue)` , which must be called with a boolean argument once it has completed. **Callback arguments changed in 2.0**
 * `callback(err, results)` - *Optional* A callback which is called after all the `iteratee`
   functions have finished.
 
@@ -548,9 +548,7 @@ If order within the original `coll` is important, then look at `detectSeries`.
 __Arguments__
 
 * `coll` - A collection to iterate over.
-* `iteratee(item, callback)` - A truth test to apply to each item in `coll`.
-  The iteratee is passed a `callback(err, truthValue)` which must be called with a
-  boolean argument once it has completed.
+* `iteratee(item, callback)` - A truth test to apply to each item in `coll`. The iteratee is passed a `callback(err, truthValue)` which must be called with a boolean argument once it has completed. **Callback arguments changed in 2.0**
 * `callback(err, result)` - *Optional* A callback which is called as soon as any iteratee returns
   `true`, or after all the `iteratee` functions have finished. Result will be
   the first item in the array that passes the truth test (iteratee) or the
@@ -640,8 +638,7 @@ __Arguments__
 
 * `coll` - A collection to iterate over.
 * `iteratee(item, callback)` - A truth test to apply to each item in the array
-  in parallel. The iteratee is passed a `callback(err, truthValue)` which must be
-  called with a boolean argument once it has completed.
+  in parallel. The iteratee is passed a `callback(err, truthValue)` which must be called with a boolean argument once it has completed. **Callback arguments changed in 2.0**
 * `callback(err, result)` - *Optional* A callback which is called as soon as any iteratee returns
   `true`, or after all the iteratee functions have finished. Result will be
   either `true` or `false` depending on the values of the async tests.
@@ -677,9 +674,7 @@ If any iteratee call returns `false`, the main `callback` is immediately called.
 __Arguments__
 
 * `coll` - A collection to iterate over.
-* `iteratee(item, callback)` - A truth test to apply to each item in the collection
-  in parallel. The iteratee is passed a `callback(err, truthValue)` which must be
-  called with a  boolean argument once it has completed.
+* `iteratee(item, callback)` - A truth test to apply to each item in the collection in parallel. The iteratee is passed a `callback(err, truthValue)` which must be called with a  boolean argument once it has completed. **Callback arguments changed in 2.0**
 * `callback(err, result)` - *Optional* A callback which is called after all the `iteratee`
   functions have finished. Result will be either `true` or `false` depending on
   the values of the async tests.
@@ -924,7 +919,7 @@ async.whilst(
 ### doWhilst(fn, test, callback)
 
 The post-check version of [`whilst`](#whilst). To reflect the difference in
-the order of operations, the arguments `test` and `fn` are switched.
+the order of operations, the arguments `test` and `fn` are switched. The `test` function is also passed the non-error callback results of `fn`.
 
 `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
 
@@ -946,7 +941,7 @@ The inverse of [`whilst`](#whilst).
 
 ### doUntil(fn, test, callback)
 
-Like [`doWhilst`](#doWhilst), except the `test` is inverted. Note the argument ordering differs from `until`.
+Like [`doWhilst`](#doWhilst), except the `test` is inverted. Note the argument ordering differs from `until`. The `test` function is also passed the non-error callback results of `fn`.
 
 ---------------------------------------
 
@@ -956,18 +951,26 @@ Like [`doWhilst`](#doWhilst), except the `test` is inverted. Note the argument o
 
 Like [`whilst`](#whilst), except the `test` is an asynchronous function that is passed a callback in the form of `function (err, truth)`. If error is passed to `test` or `fn`, the main callback is immediately called with the value of the error.
 
+Additionaly `during` passes any arguments passed by the iteratee function (2nd function) to the test function (1st function). The test callback will allways be the last parameter.
+
 __Example__
 
 ```js
 var count = 0;
 
 async.during(
-    function (callback) {
-      return callback(null, count < 5);
+    function (result, callback) {
+      if(!callback) {
+        callback = result;
+        result = null;
+      }
+      return callback(null, !result || result.counter < 5);
     },
     function (callback) {
         count++;
-        setTimeout(callback, 1000);
+        setTimeout(function() {
+          callback(null, { counter: count });
+        }, 1000);
     },
     function (err) {
         // 5 seconds have passed
@@ -1408,8 +1411,8 @@ async.auto({
 __Arguments__
 
 * `tasks` - An object. Each of its properties is either a function or an array of requirements, with the function itself the last item in the array. The object's key of a property serves as the name of the task defined by that property, i.e. can be used when specifying requirements for other tasks. The function receives one or two arguments:
-  * a `results` object, containing the results of the previously executed functions, only passed if the task has any dependencies,
-  * a `callback(err, result)` function, which must be called when finished, passing an `error` (which can be `null`) and the result of the function's execution.
+  * a `results` object, containing the results of the previously executed functions, only passed if the task has any dependencies, **Argument order changed in 2.0**
+  * a `callback(err, result)` function, which must be called when finished, passing an `error` (which can be `null`) and the result of the function's execution. **Argument order changed in 2.0**
 * `concurrency` - An optional `integer` for determining the maximum number of tasks that can be run in parallel. By default, as many as possible.
 * `callback(err, results)` - An optional callback which is called when all the tasks have been completed. It receives the `err` argument if any `tasks` pass an error to their callback. Results are always returned; however, if an error occurs, no further `tasks` will be performed, and the results object will only contain partial results.
 
@@ -1574,7 +1577,7 @@ __Arguments__
   the function's execution, and (2) a `results` object, containing the results of
   the previously executed functions (if nested inside another control flow).
 * `callback(err, results)` - An optional callback which is called when the
-  task has succeeded, or after the final failed attempt. It receives the `err` and `result` arguments of the last attempt at completing the `task`.
+  task has succeeded, or after the final failed attempt. It receives the `err` and `result` arguments of the last attempt at completing the `task`. **Callback made optional in 2.0, use `retryable` for previous behavior.**
 
 The [`retry`](#retry) function can be used as a stand-alone control flow by passing a callback, as shown below:
 
@@ -2143,7 +2146,7 @@ function(err, results){
 ---------------------------------------
 
 <a name="reflectAll"></a>
-### reflectAll()
+### reflectAll(tasks)
 
 A helper function that wraps an array of functions with reflect.
 
diff --git a/bower.json b/bower.json
index 59a175e..dfdb8bb 100644
--- a/bower.json
+++ b/bower.json
@@ -27,6 +27,7 @@
     "es6-promise": "^2.3.0",
     "fs-extra": "^0.26.7",
     "jscs": "^1.13.1",
+    "jscs-jsdoc": "^1.3.2",
     "jshint": "~2.8.0",
     "karma": "^0.13.2",
     "karma-browserify": "^4.2.1",
@@ -35,7 +36,6 @@
     "karma-mocha-reporter": "^1.0.2",
     "mocha": "^2.2.5",
     "native-promise-only": "^0.8.0-a",
-    "nodeunit": ">0.0.0",
     "nyc": "^2.1.0",
     "recursive-readdir": "^1.3.0",
     "rimraf": "^2.5.0",
@@ -62,4 +62,4 @@
   "authors": [
     "Caolan McMahon"
   ]
-}
\ No newline at end of file
+}
diff --git a/component.json b/component.json
index 7f408f5..13ac09e 100644
--- a/component.json
+++ b/component.json
@@ -1,7 +1,7 @@
 {
   "name": "async",
   "description": "Higher-order functions and common patterns for asynchronous code",
-  "version": "2.0.0-rc.3",
+  "version": "2.0.0-rc.4",
   "keywords": [
     "async",
     "callback",
diff --git a/deps/nodeunit.css b/deps/nodeunit.css
deleted file mode 100644
index 274434a..0000000
--- a/deps/nodeunit.css
+++ /dev/null
@@ -1,70 +0,0 @@
-/*!
- * Styles taken from qunit.css
- */
-
-h1#nodeunit-header, h1.nodeunit-header {
-    padding: 15px;
-    font-size: large;
-    background-color: #06b;
-    color: white;
-    font-family: 'trebuchet ms', verdana, arial;
-    margin: 0;
-}
-
-h1#nodeunit-header a {
-    color: white;
-}
-
-h2#nodeunit-banner {
-    height: 2em;
-    border-bottom: 1px solid white;
-    background-color: #eee;
-    margin: 0;
-    font-family: 'trebuchet ms', verdana, arial;
-}
-h2#nodeunit-banner.pass {
-    background-color: green;
-}
-h2#nodeunit-banner.fail {
-    background-color: red;
-}
-
-h2#nodeunit-userAgent, h2.nodeunit-userAgent {
-    padding: 10px;
-    background-color: #eee;
-    color: black;
-    margin: 0;
-    font-size: small;
-    font-weight: normal;
-    font-family: 'trebuchet ms', verdana, arial;
-    font-size: 10pt;
-}
-
-div#nodeunit-testrunner-toolbar {
-    background: #eee;
-    border-top: 1px solid black;
-    padding: 10px;
-    font-family: 'trebuchet ms', verdana, arial;
-    margin: 0;
-    font-size: 10pt;
-}
-
-ol#nodeunit-tests {
-    font-family: 'trebuchet ms', verdana, arial;
-    font-size: 10pt;
-}
-ol#nodeunit-tests li strong {
-    cursor:pointer;
-}
-ol#nodeunit-tests .pass {
-    color: green;
-} 
-ol#nodeunit-tests .fail {
-    color: red;
-} 
-
-p#nodeunit-testresult {
-    margin-left: 1em;
-    font-size: 10pt;
-    font-family: 'trebuchet ms', verdana, arial;
-}
diff --git a/deps/nodeunit.js b/deps/nodeunit.js
deleted file mode 100644
index 6251ba1..0000000
--- a/deps/nodeunit.js
+++ /dev/null
@@ -1,2117 +0,0 @@
-/*!
- * Nodeunit
- * https://github.com/caolan/nodeunit
- * Copyright (c) 2010 Caolan McMahon
- * MIT Licensed
- *
- * json2.js
- * http://www.JSON.org/json2.js
- * Public Domain.
- * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
- */
-nodeunit = (function(){
-/*
-    http://www.JSON.org/json2.js
-    2010-11-17
-
-    Public Domain.
-
-    NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
-
-    See http://www.JSON.org/js.html
-
-
-    This code should be minified before deployment.
-    See http://javascript.crockford.com/jsmin.html
-
-    USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
-    NOT CONTROL.
-
-
-    This file creates a global JSON object containing two methods: stringify
-    and parse.
-
-        JSON.stringify(value, replacer, space)
-            value       any JavaScript value, usually an object or array.
-
-            replacer    an optional parameter that determines how object
-                        values are stringified for objects. It can be a
-                        function or an array of strings.
-
-            space       an optional parameter that specifies the indentation
-                        of nested structures. If it is omitted, the text will
-                        be packed without extra whitespace. If it is a number,
-                        it will specify the number of spaces to indent at each
-                        level. If it is a string (such as '\t' or '&nbsp;'),
-                        it contains the characters used to indent at each level.
-
-            This method produces a JSON text from a JavaScript value.
-
-            When an object value is found, if the object contains a toJSON
-            method, its toJSON method will be called and the result will be
-            stringified. A toJSON method does not serialize: it returns the
-            value represented by the name/value pair that should be serialized,
-            or undefined if nothing should be serialized. The toJSON method
-            will be passed the key associated with the value, and this will be
-            bound to the value
-
-            For example, this would serialize Dates as ISO strings.
-
-                Date.prototype.toJSON = function (key) {
-                    function f(n) {
-                        // Format integers to have at least two digits.
-                        return n < 10 ? '0' + n : n;
-                    }
-
-                    return this.getUTCFullYear()   + '-' +
-                         f(this.getUTCMonth() + 1) + '-' +
-                         f(this.getUTCDate())      + 'T' +
-                         f(this.getUTCHours())     + ':' +
-                         f(this.getUTCMinutes())   + ':' +
-                         f(this.getUTCSeconds())   + 'Z';
-                };
-
-            You can provide an optional replacer method. It will be passed the
-            key and value of each member, with this bound to the containing
-            object. The value that is returned from your method will be
-            serialized. If your method returns undefined, then the member will
-            be excluded from the serialization.
-
-            If the replacer parameter is an array of strings, then it will be
-            used to select the members to be serialized. It filters the results
-            such that only members with keys listed in the replacer array are
-            stringified.
-
-            Values that do not have JSON representations, such as undefined or
-            functions, will not be serialized. Such values in objects will be
-            dropped; in arrays they will be replaced with null. You can use
-            a replacer function to replace those with JSON values.
-            JSON.stringify(undefined) returns undefined.
-
-            The optional space parameter produces a stringification of the
-            value that is filled with line breaks and indentation to make it
-            easier to read.
-
-            If the space parameter is a non-empty string, then that string will
-            be used for indentation. If the space parameter is a number, then
-            the indentation will be that many spaces.
-
-            Example:
-
-            text = JSON.stringify(['e', {pluribus: 'unum'}]);
-            // text is '["e",{"pluribus":"unum"}]'
-
-
-            text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
-            // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
-
-            text = JSON.stringify([new Date()], function (key, value) {
-                return this[key] instanceof Date ?
-                    'Date(' + this[key] + ')' : value;
-            });
-            // text is '["Date(---current time---)"]'
-
-
-        JSON.parse(text, reviver)
-            This method parses a JSON text to produce an object or array.
-            It can throw a SyntaxError exception.
-
-            The optional reviver parameter is a function that can filter and
-            transform the results. It receives each of the keys and values,
-            and its return value is used instead of the original value.
-            If it returns what it received, then the structure is not modified.
-            If it returns undefined then the member is deleted.
-
-            Example:
-
-            // Parse the text. Values that look like ISO date strings will
-            // be converted to Date objects.
-
-            myData = JSON.parse(text, function (key, value) {
-                var a;
-                if (typeof value === 'string') {
-                    a =
-/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
-                    if (a) {
-                        return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
-                            +a[5], +a[6]));
-                    }
-                }
-                return value;
-            });
-
-            myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
-                var d;
-                if (typeof value === 'string' &&
-                        value.slice(0, 5) === 'Date(' &&
-                        value.slice(-1) === ')') {
-                    d = new Date(value.slice(5, -1));
-                    if (d) {
-                        return d;
-                    }
-                }
-                return value;
-            });
-
-
-    This is a reference implementation. You are free to copy, modify, or
-    redistribute.
-*/
-
-/*jslint evil: true, strict: false, regexp: false */
-
-/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
-    call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
-    getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
-    lastIndex, length, parse, prototype, push, replace, slice, stringify,
-    test, toJSON, toString, valueOf
-*/
-
-
-// Create a JSON object only if one does not already exist. We create the
-// methods in a closure to avoid creating global variables.
-
-var JSON = {};
-
-(function () {
-    "use strict";
-
-    function f(n) {
-        // Format integers to have at least two digits.
-        return n < 10 ? '0' + n : n;
-    }
-
-    if (typeof Date.prototype.toJSON !== 'function') {
-
-        Date.prototype.toJSON = function (key) {
-
-            return isFinite(this.valueOf()) ?
-                   this.getUTCFullYear()   + '-' +
-                 f(this.getUTCMonth() + 1) + '-' +
-                 f(this.getUTCDate())      + 'T' +
-                 f(this.getUTCHours())     + ':' +
-                 f(this.getUTCMinutes())   + ':' +
-                 f(this.getUTCSeconds())   + 'Z' : null;
-        };
-
-        String.prototype.toJSON =
-        Number.prototype.toJSON =
-        Boolean.prototype.toJSON = function (key) {
-            return this.valueOf();
-        };
-    }
-
-    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
-        escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
-        gap,
-        indent,
-        meta = {    // table of character substitutions
-            '\b': '\\b',
-            '\t': '\\t',
-            '\n': '\\n',
-            '\f': '\\f',
-            '\r': '\\r',
-            '"' : '\\"',
-            '\\': '\\\\'
-        },
-        rep;
-
-
-    function quote(string) {
-
-// If the string contains no control characters, no quote characters, and no
-// backslash characters, then we can safely slap some quotes around it.
-// Otherwise we must also replace the offending characters with safe escape
-// sequences.
-
-        escapable.lastIndex = 0;
-        return escapable.test(string) ?
-            '"' + string.replace(escapable, function (a) {
-                var c = meta[a];
-                return typeof c === 'string' ? c :
-                    '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
-            }) + '"' :
-            '"' + string + '"';
-    }
-
-
-    function str(key, holder) {
-
-// Produce a string from holder[key].
-
-        var i,          // The loop counter.
-            k,          // The member key.
-            v,          // The member value.
-            length,
-            mind = gap,
-            partial,
-            value = holder[key];
-
-// If the value has a toJSON method, call it to obtain a replacement value.
-
-        if (value && typeof value === 'object' &&
-                typeof value.toJSON === 'function') {
-            value = value.toJSON(key);
-        }
-
-// If we were called with a replacer function, then call the replacer to
-// obtain a replacement value.
-
-        if (typeof rep === 'function') {
-            value = rep.call(holder, key, value);
-        }
-
-// What happens next depends on the value's type.
-
-        switch (typeof value) {
-        case 'string':
-            return quote(value);
-
-        case 'number':
-
-// JSON numbers must be finite. Encode non-finite numbers as null.
-
-            return isFinite(value) ? String(value) : 'null';
-
-        case 'boolean':
-        case 'null':
-
-// If the value is a boolean or null, convert it to a string. Note:
-// typeof null does not produce 'null'. The case is included here in
-// the remote chance that this gets fixed someday.
-
-            return String(value);
-
-// If the type is 'object', we might be dealing with an object or an array or
-// null.
-
-        case 'object':
-
-// Due to a specification blunder in ECMAScript, typeof null is 'object',
-// so watch out for that case.
-
-            if (!value) {
-                return 'null';
-            }
-
-// Make an array to hold the partial results of stringifying this object value.
-
-            gap += indent;
-            partial = [];
-
-// Is the value an array?
-
-            if (Object.prototype.toString.apply(value) === '[object Array]') {
-
-// The value is an array. Stringify every element. Use null as a placeholder
-// for non-JSON values.
-
-                length = value.length;
-                for (i = 0; i < length; i += 1) {
-                    partial[i] = str(i, value) || 'null';
-                }
-
-// Join all of the elements together, separated with commas, and wrap them in
-// brackets.
-
-                v = partial.length === 0 ? '[]' :
-                    gap ? '[\n' + gap +
-                            partial.join(',\n' + gap) + '\n' +
-                                mind + ']' :
-                          '[' + partial.join(',') + ']';
-                gap = mind;
-                return v;
-            }
-
-// If the replacer is an array, use it to select the members to be stringified.
-
-            if (rep && typeof rep === 'object') {
-                length = rep.length;
-                for (i = 0; i < length; i += 1) {
-                    k = rep[i];
-                    if (typeof k === 'string') {
-                        v = str(k, value);
-                        if (v) {
-                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
-                        }
-                    }
-                }
-            } else {
-
-// Otherwise, iterate through all of the keys in the object.
-
-                for (k in value) {
-                    if (Object.hasOwnProperty.call(value, k)) {
-                        v = str(k, value);
-                        if (v) {
-                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
-                        }
-                    }
-                }
-            }
-
-// Join all of the member texts together, separated with commas,
-// and wrap them in braces.
-
-            v = partial.length === 0 ? '{}' :
-                gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
-                        mind + '}' : '{' + partial.join(',') + '}';
-            gap = mind;
-            return v;
-        }
-    }
-
-// If the JSON object does not yet have a stringify method, give it one.
-
-    if (typeof JSON.stringify !== 'function') {
-        JSON.stringify = function (value, replacer, space) {
-
-// The stringify method takes a value and an optional replacer, and an optional
-// space parameter, and returns a JSON text. The replacer can be a function
-// that can replace values, or an array of strings that will select the keys.
-// A default replacer method can be provided. Use of the space parameter can
-// produce text that is more easily readable.
-
-            var i;
-            gap = '';
-            indent = '';
-
-// If the space parameter is a number, make an indent string containing that
-// many spaces.
-
-            if (typeof space === 'number') {
-                for (i = 0; i < space; i += 1) {
-                    indent += ' ';
-                }
-
-// If the space parameter is a string, it will be used as the indent string.
-
-            } else if (typeof space === 'string') {
-                indent = space;
-            }
-
-// If there is a replacer, it must be a function or an array.
-// Otherwise, throw an error.
-
-            rep = replacer;
-            if (replacer && typeof replacer !== 'function' &&
-                    (typeof replacer !== 'object' ||
-                     typeof replacer.length !== 'number')) {
-                throw new Error('JSON.stringify');
-            }
-
-// Make a fake root object containing our value under the key of ''.
-// Return the result of stringifying the value.
-
-            return str('', {'': value});
-        };
-    }
-
-
-// If the JSON object does not yet have a parse method, give it one.
-
-    if (typeof JSON.parse !== 'function') {
-        JSON.parse = function (text, reviver) {
-
-// The parse method takes a text and an optional reviver function, and returns
-// a JavaScript value if the text is a valid JSON text.
-
-            var j;
-
-            function walk(holder, key) {
-
-// The walk method is used to recursively walk the resulting structure so
-// that modifications can be made.
-
-                var k, v, value = holder[key];
-                if (value && typeof value === 'object') {
-                    for (k in value) {
-                        if (Object.hasOwnProperty.call(value, k)) {
-                            v = walk(value, k);
-                            if (v !== undefined) {
-                                value[k] = v;
-                            } else {
-                                delete value[k];
-                            }
-                        }
-                    }
-                }
-                return reviver.call(holder, key, value);
-            }
-
-
-// Parsing happens in four stages. In the first stage, we replace certain
-// Unicode characters with escape sequences. JavaScript handles many characters
-// incorrectly, either silently deleting them, or treating them as line endings.
-
-            text = String(text);
-            cx.lastIndex = 0;
-            if (cx.test(text)) {
-                text = text.replace(cx, function (a) {
-                    return '\\u' +
-                        ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
-                });
-            }
-
-// In the second stage, we run the text against regular expressions that look
-// for non-JSON patterns. We are especially concerned with '()' and 'new'
-// because they can cause invocation, and '=' because it can cause mutation.
-// But just to be safe, we want to reject all unexpected forms.
-
-// We split the second stage into 4 regexp operations in order to work around
-// crippling inefficiencies in IE's and Safari's regexp engines. First we
-// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
-// replace all simple value tokens with ']' characters. Third, we delete all
-// open brackets that follow a colon or comma or that begin the text. Finally,
-// we look to see that the remaining characters are only whitespace or ']' or
-// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
-
-            if (/^[\],:{}\s]*$/
-.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
-.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
-.replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
-
-// In the third stage we use the eval function to compile the text into a
-// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
-// in JavaScript: it can begin a block or an object literal. We wrap the text
-// in parens to eliminate the ambiguity.
-
-                j = eval('(' + text + ')');
-
-// In the optional fourth stage, we recursively walk the new structure, passing
-// each name/value pair to a reviver function for possible transformation.
-
-                return typeof reviver === 'function' ?
-                    walk({'': j}, '') : j;
-            }
-
-// If the text is not JSON parseable, then a SyntaxError is thrown.
-
-            throw new SyntaxError('JSON.parse');
-        };
-    }
-}());
-var assert = this.assert = {};
-var types = {};
-var core = {};
-var nodeunit = {};
-var reporter = {};
-/*global setTimeout: false, console: false */
-(function () {
-
-    var async = {};
-
-    // global on the server, window in the browser
-    var root = this,
-        previous_async = root.async;
-
-    if (typeof module !== 'undefined' && module.exports) {
-        module.exports = async;
-    }
-    else {
-        root.async = async;
-    }
-
-    async.noConflict = function () {
-        root.async = previous_async;
-        return async;
-    };
-
-    //// cross-browser compatiblity functions ////
-
-    var _forEach = function (arr, iterator) {
-        if (arr.forEach) {
-            return arr.forEach(iterator);
-        }
-        for (var i = 0; i < arr.length; i += 1) {
-            iterator(arr[i], i, arr);
-        }
-    };
-
-    var _map = function (arr, iterator) {
-        if (arr.map) {
-            return arr.map(iterator);
-        }
-        var results = [];
-        _forEach(arr, function (x, i, a) {
-            results.push(iterator(x, i, a));
-        });
-        return results;
-    };
-
-    var _reduce = function (arr, iterator, memo) {
-        if (arr.reduce) {
-            return arr.reduce(iterator, memo);
-        }
-        _forEach(arr, function (x, i, a) {
-            memo = iterator(memo, x, i, a);
-        });
-        return memo;
-    };
-
-    var _keys = function (obj) {
-        if (Object.keys) {
-            return Object.keys(obj);
-        }
-        var keys = [];
-        for (var k in obj) {
-            if (obj.hasOwnProperty(k)) {
-                keys.push(k);
-            }
-        }
-        return keys;
-    };
-
-    var _indexOf = function (arr, item) {
-        if (arr.indexOf) {
-            return arr.indexOf(item);
-        }
-        for (var i = 0; i < arr.length; i += 1) {
-            if (arr[i] === item) {
-                return i;
-            }
-        }
-        return -1;
-    };
-
-    //// exported async module functions ////
-
-    //// nextTick implementation with browser-compatible fallback ////
-    if (typeof setImmediate === 'function') {
-        async.nextTick = function (fn) {
-            setImmediate(fn);
-        };
-    }
-    else if (typeof process !== 'undefined' && process.nextTick) {
-        async.nextTick = process.nextTick;
-    }
-    else {
-        async.nextTick = function (fn) {
-            setTimeout(fn, 0);
-        };
-    }
-
-    async.forEach = function (arr, iterator, callback) {
-        if (!arr.length) {
-            return callback();
-        }
-        var completed = 0;
-        _forEach(arr, function (x) {
-            iterator(x, function (err) {
-                if (err) {
-                    callback(err);
-                    callback = function () {};
-                }
-                else {
-                    completed += 1;
-                    if (completed === arr.length) {
-                        callback();
-                    }
-                }
-            });
-        });
-    };
-
-    async.forEachSeries = function (arr, iterator, callback) {
-        if (!arr.length) {
-            return callback();
-        }
-        var completed = 0;
-        var iterate = function () {
-            iterator(arr[completed], function (err) {
-                if (err) {
-                    callback(err);
-                    callback = function () {};
-                }
-                else {
-                    completed += 1;
-                    if (completed === arr.length) {
-                        callback();
-                    }
-                    else {
-                        iterate();
-                    }
-                }
-            });
-        };
-        iterate();
-    };
-
-
-    var doParallel = function (fn) {
-        return function () {
-            var args = Array.prototype.slice.call(arguments);
-            return fn.apply(null, [async.forEach].concat(args));
-        };
-    };
-    var doSeries = function (fn) {
-        return function () {
-            var args = Array.prototype.slice.call(arguments);
-            return fn.apply(null, [async.forEachSeries].concat(args));
-        };
-    };
-
-
-    var _asyncMap = function (eachfn, arr, iterator, callback) {
-        var results = [];
-        arr = _map(arr, function (x, i) {
-            return {index: i, value: x};
-        });
-        eachfn(arr, function (x, callback) {
-            iterator(x.value, function (err, v) {
-                results[x.index] = v;
-                callback(err);
-            });
-        }, function (err) {
-            callback(err, results);
-        });
-    };
-    async.map = doParallel(_asyncMap);
-    async.mapSeries = doSeries(_asyncMap);
-
-
-    // reduce only has a series version, as doing reduce in parallel won't
-    // work in many situations.
-    async.reduce = function (arr, memo, iterator, callback) {
-        async.forEachSeries(arr, function (x, callback) {
-            iterator(memo, x, function (err, v) {
-                memo = v;
-                callback(err);
-            });
-        }, function (err) {
-            callback(err, memo);
-        });
-    };
-    // inject alias
-    async.inject = async.reduce;
-    // foldl alias
-    async.foldl = async.reduce;
-
-    async.reduceRight = function (arr, memo, iterator, callback) {
-        var reversed = _map(arr, function (x) {
-            return x;
-        }).reverse();
-        async.reduce(reversed, memo, iterator, callback);
-    };
-    // foldr alias
-    async.foldr = async.reduceRight;
-
-    var _filter = function (eachfn, arr, iterator, callback) {
-        var results = [];
-        arr = _map(arr, function (x, i) {
-            return {index: i, value: x};
-        });
-        eachfn(arr, function (x, callback) {
-            iterator(x.value, function (v) {
-                if (v) {
-                    results.push(x);
-                }
-                callback();
-            });
-        }, function (err) {
-            callback(_map(results.sort(function (a, b) {
-                return a.index - b.index;
-            }), function (x) {
-                return x.value;
-            }));
-        });
-    };
-    async.filter = doParallel(_filter);
-    async.filterSeries = doSeries(_filter);
-    // select alias
-    async.select = async.filter;
-    async.selectSeries = async.filterSeries;
-
-    var _reject = function (eachfn, arr, iterator, callback) {
-        var results = [];
-        arr = _map(arr, function (x, i) {
-            return {index: i, value: x};
-        });
-        eachfn(arr, function (x, callback) {
-            iterator(x.value, function (v) {
-                if (!v) {
-                    results.push(x);
-                }
-                callback();
-            });
-        }, function (err) {
-            callback(_map(results.sort(function (a, b) {
-                return a.index - b.index;
-            }), function (x) {
-                return x.value;
-            }));
-        });
-    };
-    async.reject = doParallel(_reject);
-    async.rejectSeries = doSeries(_reject);
-
-    var _detect = function (eachfn, arr, iterator, main_callback) {
-        eachfn(arr, function (x, callback) {
-            iterator(x, function (result) {
-                if (result) {
-                    main_callback(x);
-                }
-                else {
-                    callback();
-                }
-            });
-        }, function (err) {
-            main_callback();
-        });
-    };
-    async.detect = doParallel(_detect);
-    async.detectSeries = doSeries(_detect);
-
-    async.some = function (arr, iterator, main_callback) {
-        async.forEach(arr, function (x, callback) {
-            iterator(x, function (v) {
-                if (v) {
-                    main_callback(true);
-                    main_callback = function () {};
-                }
-                callback();
-            });
-        }, function (err) {
-            main_callback(false);
-        });
-    };
-    // any alias
-    async.any = async.some;
-
-    async.every = function (arr, iterator, main_callback) {
-        async.forEach(arr, function (x, callback) {
-            iterator(x, function (v) {
-                if (!v) {
-                    main_callback(false);
-                    main_callback = function () {};
-                }
-                callback();
-            });
-        }, function (err) {
-            main_callback(true);
-        });
-    };
-    // all alias
-    async.all = async.every;
-
-    async.sortBy = function (arr, iterator, callback) {
-        async.map(arr, function (x, callback) {
-            iterator(x, function (err, criteria) {
-                if (err) {
-                    callback(err);
-                }
-                else {
-                    callback(null, {value: x, criteria: criteria});
-                }
-            });
-        }, function (err, results) {
-            if (err) {
-                return callback(err);
-            }
-            else {
-                var fn = function (left, right) {
-                    var a = left.criteria, b = right.criteria;
-                    return a < b ? -1 : a > b ? 1 : 0;
-                };
-                callback(null, _map(results.sort(fn), function (x) {
-                    return x.value;
-                }));
-            }
-        });
-    };
-
-    async.auto = function (tasks, callback) {
-        callback = callback || function () {};
-        var keys = _keys(tasks);
-        if (!keys.length) {
-            return callback(null);
-        }
-
-        var completed = [];
-
-        var listeners = [];
-        var addListener = function (fn) {
-            listeners.unshift(fn);
-        };
-        var removeListener = function (fn) {
-            for (var i = 0; i < listeners.length; i += 1) {
-                if (listeners[i] === fn) {
-                    listeners.splice(i, 1);
-                    return;
-                }
-            }
-        };
-        var taskComplete = function () {
-            _forEach(listeners, function (fn) {
-                fn();
-            });
-        };
-
-        addListener(function () {
-            if (completed.length === keys.length) {
-                callback(null);
-            }
-        });
-
-        _forEach(keys, function (k) {
-            var task = (tasks[k] instanceof Function) ? [tasks[k]]: tasks[k];
-            var taskCallback = function (err) {
-                if (err) {
-                    callback(err);
-                    // stop subsequent errors hitting callback multiple times
-                    callback = function () {};
-                }
-                else {
-                    completed.push(k);
-                    taskComplete();
-                }
-            };
-            var requires = task.slice(0, Math.abs(task.length - 1)) || [];
-            var ready = function () {
-                return _reduce(requires, function (a, x) {
-                    return (a && _indexOf(completed, x) !== -1);
-                }, true);
-            };
-            if (ready()) {
-                task[task.length - 1](taskCallback);
-            }
-            else {
-                var listener = function () {
-                    if (ready()) {
-                        removeListener(listener);
-                        task[task.length - 1](taskCallback);
-                    }
-                };
-                addListener(listener);
-            }
-        });
-    };
-
-    async.waterfall = function (tasks, callback) {
-        if (!tasks.length) {
-            return callback();
-        }
-        callback = callback || function () {};
-        var wrapIterator = function (iterator) {
-            return function (err) {
-                if (err) {
-                    callback(err);
-                    callback = function () {};
-                }
-                else {
-                    var args = Array.prototype.slice.call(arguments, 1);
-                    var next = iterator.next();
-                    if (next) {
-                        args.push(wrapIterator(next));
-                    }
-                    else {
-                        args.push(callback);
-                    }
-                    async.nextTick(function () {
-                        iterator.apply(null, args);
-                    });
-                }
-            };
-        };
-        wrapIterator(async.iterator(tasks))();
-    };
-
-    async.parallel = function (tasks, callback) {
-        callback = callback || function () {};
-        if (tasks.constructor === Array) {
-            async.map(tasks, function (fn, callback) {
-                if (fn) {
-                    fn(function (err) {
-                        var args = Array.prototype.slice.call(arguments, 1);
-                        if (args.length <= 1) {
-                            args = args[0];
-                        }
-                        callback.call(null, err, args || null);
-                    });
-                }
-            }, callback);
-        }
-        else {
-            var results = {};
-            async.forEach(_keys(tasks), function (k, callback) {
-                tasks[k](function (err) {
-                    var args = Array.prototype.slice.call(arguments, 1);
-                    if (args.length <= 1) {
-                        args = args[0];
-                    }
-                    results[k] = args;
-                    callback(err);
-                });
-            }, function (err) {
-                callback(err, results);
-            });
-        }
-    };
-
-    async.series = function (tasks, callback) {
-        callback = callback || function () {};
-        if (tasks.constructor === Array) {
-            async.mapSeries(tasks, function (fn, callback) {
-                if (fn) {
-                    fn(function (err) {
-                        var args = Array.prototype.slice.call(arguments, 1);
-                        if (args.length <= 1) {
-                            args = args[0];
-                        }
-                        callback.call(null, err, args || null);
-                    });
-                }
-            }, callback);
-        }
-        else {
-            var results = {};
-            async.forEachSeries(_keys(tasks), function (k, callback) {
-                tasks[k](function (err) {
-                    var args = Array.prototype.slice.call(arguments, 1);
-                    if (args.length <= 1) {
-                        args = args[0];
-                    }
-                    results[k] = args;
-                    callback(err);
-                });
-            }, function (err) {
-                callback(err, results);
-            });
-        }
-    };
-
-    async.iterator = function (tasks) {
-        var makeCallback = function (index) {
-            var fn = function () {
-                if (tasks.length) {
-                    tasks[index].apply(null, arguments);
-                }
-                return fn.next();
-            };
-            fn.next = function () {
-                return (index < tasks.length - 1) ? makeCallback(index + 1): null;
-            };
-            return fn;
-        };
-        return makeCallback(0);
-    };
-
-    async.apply = function (fn) {
-        var args = Array.prototype.slice.call(arguments, 1);
-        return function () {
-            return fn.apply(
-                null, args.concat(Array.prototype.slice.call(arguments))
-            );
-        };
-    };
-
-    var _concat = function (eachfn, arr, fn, callback) {
-        var r = [];
-        eachfn(arr, function (x, cb) {
-            fn(x, function (err, y) {
-                r = r.concat(y || []);
-                cb(err);
-            });
-        }, function (err) {
-            callback(err, r);
-        });
-    };
-    async.concat = doParallel(_concat);
-    async.concatSeries = doSeries(_concat);
-
-    async.whilst = function (test, iterator, callback) {
-        if (test()) {
-            iterator(function (err) {
-                if (err) {
-                    return callback(err);
-                }
-                async.whilst(test, iterator, callback);
-            });
-        }
-        else {
-            callback();
-        }
-    };
-
-    async.until = function (test, iterator, callback) {
-        if (!test()) {
-            iterator(function (err) {
-                if (err) {
-                    return callback(err);
-                }
-                async.until(test, iterator, callback);
-            });
-        }
-        else {
-            callback();
-        }
-    };
-
-    async.queue = function (worker, concurrency) {
-        var workers = 0;
-        var tasks = [];
-        var q = {
-            concurrency: concurrency,
-            push: function (data, callback) {
-                tasks.push({data: data, callback: callback});
-                async.nextTick(q.process);
-            },
-            process: function () {
-                if (workers < q.concurrency && tasks.length) {
-                    var task = tasks.splice(0, 1)[0];
-                    workers += 1;
-                    worker(task.data, function () {
-                        workers -= 1;
-                        if (task.callback) {
-                            task.callback.apply(task, arguments);
-                        }
-                        q.process();
-                    });
-                }
-            },
-            length: function () {
-                return tasks.length;
-            }
-        };
-        return q;
-    };
-
-    var _console_fn = function (name) {
-        return function (fn) {
-            var args = Array.prototype.slice.call(arguments, 1);
-            fn.apply(null, args.concat([function (err) {
-                var args = Array.prototype.slice.call(arguments, 1);
-                if (typeof console !== 'undefined') {
-                    if (err) {
-                        if (console.error) {
-                            console.error(err);
-                        }
-                    }
-                    else if (console[name]) {
-                        _forEach(args, function (x) {
-                            console[name](x);
-                        });
-                    }
-                }
-            }]));
-        };
-    };
-    async.log = _console_fn('log');
-    async.dir = _console_fn('dir');
-    /*async.info = _console_fn('info');
-    async.warn = _console_fn('warn');
-    async.error = _console_fn('error');*/
-
-    async.memoize = function (fn, hasher) {
-        var memo = {};
-        hasher = hasher || function (x) {
-            return x;
-        };
-        return function () {
-            var args = Array.prototype.slice.call(arguments);
-            var callback = args.pop();
-            var key = hasher.apply(null, args);
-            if (key in memo) {
-                callback.apply(null, memo[key]);
-            }
-            else {
-                fn.apply(null, args.concat([function () {
-                    memo[key] = arguments;
-                    callback.apply(null, arguments);
-                }]));
-            }
-        };
-    };
-
-}());
-(function(exports){
-/**
- * This file is based on the node.js assert module, but with some small
- * changes for browser-compatibility
- * THIS FILE SHOULD BE BROWSER-COMPATIBLE JS!
- */
-
-
-/**
- * Added for browser compatibility
- */
-
-var _keys = function(obj){
-    if(Object.keys) return Object.keys(obj);
-    if (typeof obj != 'object' && typeof obj != 'function') {
-        throw new TypeError('-');
-    }
-    var keys = [];
-    for(var k in obj){
-        if(obj.hasOwnProperty(k)) keys.push(k);
-    }
-    return keys;
-};
-
-
-
-// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
-//
-// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
-//
-// Originally from narwhal.js (http://narwhaljs.org)
-// Copyright (c) 2009 Thomas Robinson <280north.com>
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the 'Software'), to
-// deal in the Software without restriction, including without limitation the
-// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-// sell copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
-var pSlice = Array.prototype.slice;
-
-// 1. The assert module provides functions that throw
-// AssertionError's when particular conditions are not met. The
-// assert module must conform to the following interface.
-
-var assert = exports;
-
-// 2. The AssertionError is defined in assert.
-// new assert.AssertionError({message: message, actual: actual, expected: expected})
-
-assert.AssertionError = function AssertionError (options) {
-  this.name = "AssertionError";
-  this.message = options.message;
-  this.actual = options.actual;
-  this.expected = options.expected;
-  this.operator = options.operator;
-  var stackStartFunction = options.stackStartFunction || fail;
-
-  if (Error.captureStackTrace) {
-    Error.captureStackTrace(this, stackStartFunction);
-  }
-};
-// code from util.inherits in node
-assert.AssertionError.super_ = Error;
-
-
-// EDITED FOR BROWSER COMPATIBILITY: replaced Object.create call
-// TODO: test what effect this may have
-var ctor = function () { this.constructor = assert.AssertionError; };
-ctor.prototype = Error.prototype;
-assert.AssertionError.prototype = new ctor();
-
-
-assert.AssertionError.prototype.toString = function() {
-  if (this.message) {
-    return [this.name+":", this.message].join(' ');
-  } else {
-    return [ this.name+":"
-           , typeof this.expected !== 'undefined' ? JSON.stringify(this.expected) : 'undefined'
-           , this.operator
-           , typeof this.actual !== 'undefined' ? JSON.stringify(this.actual) : 'undefined'
-           ].join(" ");
-  }
-};
-
-// assert.AssertionError instanceof Error
-
-assert.AssertionError.__proto__ = Error.prototype;
-
-// At present only the three keys mentioned above are used and
-// understood by the spec. Implementations or sub modules can pass
-// other keys to the AssertionError's constructor - they will be
-// ignored.
-
-// 3. All of the following functions must throw an AssertionError
-// when a corresponding condition is not met, with a message that
-// may be undefined if not provided.  All assertion methods provide
-// both the actual and expected values to the assertion error for
-// display purposes.
-
-function fail(actual, expected, message, operator, stackStartFunction) {
-  throw new assert.AssertionError({
-    message: message,
-    actual: actual,
-    expected: expected,
-    operator: operator,
-    stackStartFunction: stackStartFunction
-  });
-}
-
-// EXTENSION! allows for well behaved errors defined elsewhere.
-assert.fail = fail;
-
-// 4. Pure assertion tests whether a value is truthy, as determined
-// by !!guard.
-// assert.ok(guard, message_opt);
-// This statement is equivalent to assert.equal(true, guard,
-// message_opt);. To test strictly for the value true, use
-// assert.strictEqual(true, guard, message_opt);.
-
-assert.ok = function ok(value, message) {
-  if (!!!value) fail(value, true, message, "==", assert.ok);
-};
-
-// 5. The equality assertion tests shallow, coercive equality with
-// ==.
-// assert.equal(actual, expected, message_opt);
-
-assert.equal = function equal(actual, expected, message) {
-  if (actual != expected) fail(actual, expected, message, "==", assert.equal);
-};
-
-// 6. The non-equality assertion tests for whether two objects are not equal
-// with != assert.notEqual(actual, expected, message_opt);
-
-assert.notEqual = function notEqual(actual, expected, message) {
-  if (actual == expected) {
-    fail(actual, expected, message, "!=", assert.notEqual);
-  }
-};
-
-// 7. The equivalence assertion tests a deep equality relation.
-// assert.deepEqual(actual, expected, message_opt);
-
-assert.deepEqual = function deepEqual(actual, expected, message) {
-  if (!_deepEqual(actual, expected)) {
-    fail(actual, expected, message, "deepEqual", assert.deepEqual);
-  }
-};
-
-var Buffer = null;
-if (typeof require !== 'undefined' && typeof process !== 'undefined') {
-    try {
-        Buffer = require('buffer').Buffer;
-    }
-    catch (e) {
-        // May be a CommonJS environment other than Node.js
-        Buffer = null;
-    }
-}
-
-function _deepEqual(actual, expected) {
-  // 7.1. All identical values are equivalent, as determined by ===.
-  if (actual === expected) {
-    return true;
-  // 7.2. If the expected value is a Date object, the actual value is
-  // equivalent if it is also a Date object that refers to the same time.
-  } else if (actual instanceof Date && expected instanceof Date) {
-    return actual.getTime() === expected.getTime();
-
-  // 7.2.1 If the expcted value is a RegExp object, the actual value is
-  // equivalent if it is also a RegExp object that refers to the same source and options
-  } else if (actual instanceof RegExp && expected instanceof RegExp) {
-    return actual.source === expected.source &&
-           actual.global === expected.global &&
-           actual.ignoreCase === expected.ignoreCase &&
-           actual.multiline === expected.multiline;
-
-  } else if (Buffer && actual instanceof Buffer && expected instanceof Buffer) {
-    return (function() {
-      var i, len;
-
-      for (i = 0, len = expected.length; i < len; i++) {
-        if (actual[i] !== expected[i]) {
-          return false;
-        }
-      }
-      return actual.length === expected.length;
-    })();
-  // 7.3. Other pairs that do not both pass typeof value == "object",
-  // equivalence is determined by ==.
-  } else if (typeof actual != 'object' && typeof expected != 'object') {
-    return actual == expected;
-
-  // 7.4. For all other Object pairs, including Array objects, equivalence is
-  // determined by having the same number of owned properties (as verified
-  // with Object.prototype.hasOwnProperty.call), the same set of keys
-  // (although not necessarily the same order), equivalent values for every
-  // corresponding key, and an identical "prototype" property. Note: this
-  // accounts for both named and indexed properties on Arrays.
-  } else {
-    return objEquiv(actual, expected);
-  }
-}
-
-function isUndefinedOrNull (value) {
-  return value === null || value === undefined;
-}
-
-function isArguments (object) {
-  return Object.prototype.toString.call(object) == '[object Arguments]';
-}
-
-function objEquiv (a, b) {
-  if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
-    return false;
-  // an identical "prototype" property.
-  if (a.prototype !== b.prototype) return false;
-  //~~~I've managed to break Object.keys through screwy arguments passing.
-  //   Converting to array solves the problem.
-  if (isArguments(a)) {
-    if (!isArguments(b)) {
-      return false;
-    }
-    a = pSlice.call(a);
-    b = pSlice.call(b);
-    return _deepEqual(a, b);
-  }
-  try{
-    var ka = _keys(a),
-      kb = _keys(b),
-      key, i;
-  } catch (e) {//happens when one is a string literal and the other isn't
-    return false;
-  }
-  // having the same number of owned properties (keys incorporates hasOwnProperty)
-  if (ka.length != kb.length)
-    return false;
-  //the same set of keys (although not necessarily the same order),
-  ka.sort();
-  kb.sort();
-  //~~~cheap key test
-  for (i = ka.length - 1; i >= 0; i--) {
-    if (ka[i] != kb[i])
-      return false;
-  }
-  //equivalent values for every corresponding key, and
-  //~~~possibly expensive deep test
-  for (i = ka.length - 1; i >= 0; i--) {
-    key = ka[i];
-    if (!_deepEqual(a[key], b[key] ))
-       return false;
-  }
-  return true;
-}
-
-// 8. The non-equivalence assertion tests for any deep inequality.
-// assert.notDeepEqual(actual, expected, message_opt);
-
-assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
-  if (_deepEqual(actual, expected)) {
-    fail(actual, expected, message, "notDeepEqual", assert.notDeepEqual);
-  }
-};
-
-// 9. The strict equality assertion tests strict equality, as determined by ===.
-// assert.strictEqual(actual, expected, message_opt);
-
-assert.strictEqual = function strictEqual(actual, expected, message) {
-  if (actual !== expected) {
-    fail(actual, expected, message, "===", assert.strictEqual);
-  }
-};
-
-// 10. The strict non-equality assertion tests for strict inequality, as determined by !==.
-// assert.notStrictEqual(actual, expected, message_opt);
-
-assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
-  if (actual === expected) {
-    fail(actual, expected, message, "!==", assert.notStrictEqual);
-  }
-};
-
-function expectedException(actual, expected) {
-  if (!actual || !expected) {
-    return false;
-  }
-
-  if (expected instanceof RegExp) {
-    return expected.test(actual.message || actual);
-  } else if (actual instanceof expected) {
-    return true;
-  } else if (expected.call({}, actual) === true) {
-    return true;
-  }
-
-  return false;
-}
-
-function _throws(shouldThrow, block, expected, message) {
-  var actual;
-
-  if (typeof expected === 'string') {
-    message = expected;
-    expected = null;
-  }
-
-  try {
-    block();
-  } catch (e) {
-    actual = e;
-  }
-
-  message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
-            (message ? ' ' + message : '.');
-
-  if (shouldThrow && !actual) {
-    fail('Missing expected exception' + message);
-  }
-
-  if (!shouldThrow && expectedException(actual, expected)) {
-    fail('Got unwanted exception' + message);
-  }
-
-  if ((shouldThrow && actual && expected &&
-      !expectedException(actual, expected)) || (!shouldThrow && actual)) {
-    throw actual;
-  }
-}
-
-// 11. Expected to throw an error:
-// assert.throws(block, Error_opt, message_opt);
-
-assert.throws = function(block, /*optional*/error, /*optional*/message) {
-  _throws.apply(this, [true].concat(pSlice.call(arguments)));
-};
-
-// EXTENSION! This is annoying to write outside this module.
-assert.doesNotThrow = function(block, /*optional*/error, /*optional*/message) {
-  _throws.apply(this, [false].concat(pSlice.call(arguments)));
-};
-
-assert.ifError = function (err) { if (err) {throw err;}};
-})(assert);
-(function(exports){
-/*!
- * Nodeunit
- * Copyright (c) 2010 Caolan McMahon
- * MIT Licensed
- *
- * THIS FILE SHOULD BE BROWSER-COMPATIBLE JS!
- * Only code on that line will be removed, it's mostly to avoid requiring code
- * that is node specific
- */
-
-/**
- * Module dependencies
- */
-
-
-
-/**
- * Creates assertion objects representing the result of an assert call.
- * Accepts an object or AssertionError as its argument.
- *
- * @param {object} obj
- * @api public
- */
-
-exports.assertion = function (obj) {
-    return {
-        method: obj.method || '',
-        message: obj.message || (obj.error && obj.error.message) || '',
-        error: obj.error,
-        passed: function () {
-            return !this.error;
-        },
-        failed: function () {
-            return Boolean(this.error);
-        }
-    };
-};
-
-/**
- * Creates an assertion list object representing a group of assertions.
- * Accepts an array of assertion objects.
- *
- * @param {Array} arr
- * @param {Number} duration
- * @api public
- */
-
-exports.assertionList = function (arr, duration) {
-    var that = arr || [];
-    that.failures = function () {
-        var failures = 0;
-        for (var i = 0; i < this.length; i += 1) {
-            if (this[i].failed()) {
-                failures += 1;
-            }
-        }
-        return failures;
-    };
-    that.passes = function () {
-        return that.length - that.failures();
-    };
-    that.duration = duration || 0;
-    return that;
-};
-
-/**
- * Create a wrapper function for assert module methods. Executes a callback
- * after it's complete with an assertion object representing the result.
- *
- * @param {Function} callback
- * @api private
- */
-
-var assertWrapper = function (callback) {
-    return function (new_method, assert_method, arity) {
-        return function () {
-            var message = arguments[arity - 1];
-            var a = exports.assertion({method: new_method, message: message});
-            try {
-                assert[assert_method].apply(null, arguments);
-            }
-            catch (e) {
-                a.error = e;
-            }
-            callback(a);
-        };
-    };
-};
-
-/**
- * Creates the 'test' object that gets passed to every test function.
- * Accepts the name of the test function as its first argument, followed by
- * the start time in ms, the options object and a callback function.
- *
- * @param {String} name
- * @param {Number} start
- * @param {Object} options
- * @param {Function} callback
- * @api public
- */
-
-exports.test = function (name, start, options, callback) {
-    var expecting;
-    var a_list = [];
-
-    var wrapAssert = assertWrapper(function (a) {
-        a_list.push(a);
-        if (options.log) {
-            async.nextTick(function () {
-                options.log(a);
-            });
-        }
-    });
-
-    var test = {
-        done: function (err) {
-            if (expecting !== undefined && expecting !== a_list.length) {
-                var e = new Error(
-                    'Expected ' + expecting + ' assertions, ' +
-                    a_list.length + ' ran'
-                );
-                var a1 = exports.assertion({method: 'expect', error: e});
-                a_list.push(a1);
-                if (options.log) {
-                    async.nextTick(function () {
-                        options.log(a1);
-                    });
-                }
-            }
-            if (err) {
-                var a2 = exports.assertion({error: err});
-                a_list.push(a2);
-                if (options.log) {
-                    async.nextTick(function () {
-                        options.log(a2);
-                    });
-                }
-            }
-            var end = new Date().getTime();
-            async.nextTick(function () {
-                var assertion_list = exports.assertionList(a_list, end - start);
-                options.testDone(name, assertion_list);
-                callback(null, a_list);
-            });
-        },
-        ok: wrapAssert('ok', 'ok', 2),
-        same: wrapAssert('same', 'deepEqual', 3),
-        equals: wrapAssert('equals', 'equal', 3),
-        expect: function (num) {
-            expecting = num;
-        },
-        _assertion_list: a_list
-    };
-    // add all functions from the assert module
-    for (var k in assert) {
-        if (assert.hasOwnProperty(k)) {
-            test[k] = wrapAssert(k, k, assert[k].length);
-        }
-    }
-    return test;
-};
-
-/**
- * Ensures an options object has all callbacks, adding empty callback functions
- * if any are missing.
- *
- * @param {Object} opt
- * @return {Object}
- * @api public
- */
-
-exports.options = function (opt) {
-    var optionalCallback = function (name) {
-        opt[name] = opt[name] || function () {};
-    };
-
-    optionalCallback('moduleStart');
-    optionalCallback('moduleDone');
-    optionalCallback('testStart');
-    optionalCallback('testReady');
-    optionalCallback('testDone');
-    //optionalCallback('log');
-
-    // 'done' callback is not optional.
-
-    return opt;
-};
-})(types);
-(function(exports){
-/*!
- * Nodeunit
- * Copyright (c) 2010 Caolan McMahon
- * MIT Licensed
- *
- * THIS FILE SHOULD BE BROWSER-COMPATIBLE JS!
- * Only code on that line will be removed, it's mostly to avoid requiring code
- * that is node specific
- */
-
-/**
- * Module dependencies
- */
-
-
-
-/**
- * Added for browser compatibility
- */
-
-var _keys = function (obj) {
-    if (Object.keys) {
-        return Object.keys(obj);
-    }
-    var keys = [];
-    for (var k in obj) {
-        if (obj.hasOwnProperty(k)) {
-            keys.push(k);
-        }
-    }
-    return keys;
-};
-
-
-var _copy = function (obj) {
-    var nobj = {};
-    var keys = _keys(obj);
-    for (var i = 0; i <  keys.length; i += 1) {
-        nobj[keys[i]] = obj[keys[i]];
-    }
-    return nobj;
-};
-
-
-/**
- * Runs a test function (fn) from a loaded module. After the test function
- * calls test.done(), the callback is executed with an assertionList as its
- * second argument.
- *
- * @param {String} name
- * @param {Function} fn
- * @param {Object} opt
- * @param {Function} callback
- * @api public
- */
-
-exports.runTest = function (name, fn, opt, callback) {
-    var options = types.options(opt);
-
-    options.testStart(name);
-    var start = new Date().getTime();
-    var test = types.test(name, start, options, callback);
-
-    options.testReady(test);
-    try {
-        fn(test);
-    }
-    catch (e) {
-        test.done(e);
-    }
-};
-
-/**
- * Takes an object containing test functions or other test suites as properties
- * and runs each in series. After all tests have completed, the callback is
- * called with a list of all assertions as the second argument.
- *
- * If a name is passed to this function it is prepended to all test and suite
- * names that run within it.
- *
- * @param {String} name
- * @param {Object} suite
- * @param {Object} opt
- * @param {Function} callback
- * @api public
- */
-
-exports.runSuite = function (name, suite, opt, callback) {
-    suite = wrapGroup(suite);
-    var keys = _keys(suite);
-
-    async.concatSeries(keys, function (k, cb) {
-        var prop = suite[k], _name;
-
-        _name = name ? [].concat(name, k) : [k];
-        _name.toString = function () {
-            // fallback for old one
-            return this.join(' - ');
-        };
-
-        if (typeof prop === 'function') {
-            var in_name = false,
-                in_specific_test = (_name.toString() === opt.testFullSpec) ? true : false;
-            for (var i = 0; i < _name.length; i += 1) {
-                if (_name[i] === opt.testspec) {
-                    in_name = true;
-                }
-            }
-
-            if ((!opt.testFullSpec || in_specific_test) && (!opt.testspec || in_name)) {
-                if (opt.moduleStart) {
-                    opt.moduleStart();
-                }
-                exports.runTest(_name, suite[k], opt, cb);
-            }
-            else {
-                return cb();
-            }
-        }
-        else {
-            exports.runSuite(_name, suite[k], opt, cb);
-        }
-    }, callback);
-};
-
-/**
- * Run each exported test function or test suite from a loaded module.
- *
- * @param {String} name
- * @param {Object} mod
- * @param {Object} opt
- * @param {Function} callback
- * @api public
- */
-
-exports.runModule = function (name, mod, opt, callback) {
-    var options = _copy(types.options(opt));
-
-    var _run = false;
-    var _moduleStart = options.moduleStart;
-
-    mod = wrapGroup(mod);
-
-    function run_once() {
-        if (!_run) {
-            _run = true;
-            _moduleStart(name);
-        }
-    }
-    options.moduleStart = run_once;
-
-    var start = new Date().getTime();
-
-    exports.runSuite(null, mod, options, function (err, a_list) {
-        var end = new Date().getTime();
-        var assertion_list = types.assertionList(a_list, end - start);
-        options.moduleDone(name, assertion_list);
-        if (nodeunit.complete) {
-            nodeunit.complete(name, assertion_list);
-        }
-        callback(null, a_list);
-    });
-};
-
-/**
- * Treats an object literal as a list of modules keyed by name. Runs each
- * module and finished with calling 'done'. You can think of this as a browser
- * safe alternative to runFiles in the nodeunit module.
- *
- * @param {Object} modules
- * @param {Object} opt
- * @api public
- */
-
-// TODO: add proper unit tests for this function
-exports.runModules = function (modules, opt) {
-    var all_assertions = [];
-    var options = types.options(opt);
-    var start = new Date().getTime();
-
-    async.concatSeries(_keys(modules), function (k, cb) {
-        exports.runModule(k, modules[k], options, cb);
-    },
-    function (err, all_assertions) {
-        var end = new Date().getTime();
-        options.done(types.assertionList(all_assertions, end - start));
-    });
-};
-
-
-/**
- * Wraps a test function with setUp and tearDown functions.
- * Used by testCase.
- *
- * @param {Function} setUp
- * @param {Function} tearDown
- * @param {Function} fn
- * @api private
- */
-
-var wrapTest = function (setUp, tearDown, fn) {
-    return function (test) {
-        var context = {};
-        if (tearDown) {
-            var done = test.done;
-            test.done = function (err) {
-                try {
-                    tearDown.call(context, function (err2) {
-                        if (err && err2) {
-                            test._assertion_list.push(
-                                types.assertion({error: err})
-                            );
-                            return done(err2);
-                        }
-                        done(err || err2);
-                    });
-                }
-                catch (e) {
-                    done(e);
-                }
-            };
-        }
-        if (setUp) {
-            setUp.call(context, function (err) {
-                if (err) {
-                    return test.done(err);
-                }
-                fn.call(context, test);
-            });
-        }
-        else {
-            fn.call(context, test);
-        }
-    };
-};
-
-
-/**
- * Returns a serial callback from two functions.
- *
- * @param {Function} funcFirst
- * @param {Function} funcSecond
- * @api private
- */
-
-var getSerialCallback = function (fns) {
-    if (!fns.length) {
-        return null;
-    }
-    return function (callback) {
-        var that = this;
-        var bound_fns = [];
-        for (var i = 0, len = fns.length; i < len; i++) {
-            (function (j) {
-                bound_fns.push(function () {
-                    return fns[j].apply(that, arguments);
-                });
-            })(i);
-        }
-        return async.series(bound_fns, callback);
-    };
-};
-
-
-/**
- * Wraps a group of tests with setUp and tearDown functions.
- * Used by testCase.
- *
- * @param {Object} group
- * @param {Array} setUps - parent setUp functions
- * @param {Array} tearDowns - parent tearDown functions
- * @api private
- */
-
-var wrapGroup = function (group, setUps, tearDowns) {
-    var tests = {};
-
-    var setUps = setUps ? setUps.slice(): [];
-    var tearDowns = tearDowns ? tearDowns.slice(): [];
-
-    if (group.setUp) {
-        setUps.push(group.setUp);
-        delete group.setUp;
-    }
-    if (group.tearDown) {
-        tearDowns.unshift(group.tearDown);
-        delete group.tearDown;
-    }
-
-    var keys = _keys(group);
-
-    for (var i = 0; i < keys.length; i += 1) {
-        var k = keys[i];
-        if (typeof group[k] === 'function') {
-            tests[k] = wrapTest(
-                getSerialCallback(setUps),
-                getSerialCallback(tearDowns),
-                group[k]
-            );
-        }
-        else if (typeof group[k] === 'object') {
-            tests[k] = wrapGroup(group[k], setUps, tearDowns);
-        }
-    }
-    return tests;
-};
-
-
-/**
- * Backwards compatibility for test suites using old testCase API
- */
-
-exports.testCase = function (suite) {
-    return suite;
-};
-})(core);
-(function(exports){
-/*!
- * Nodeunit
- * Copyright (c) 2010 Caolan McMahon
- * MIT Licensed
- *
- * THIS FILE SHOULD BE BROWSER-COMPATIBLE JS!
- * Only code on that line will be removed, its mostly to avoid requiring code
- * that is node specific
- */
-
-
-/**
- * NOTE: this test runner is not listed in index.js because it cannot be
- * used with the command-line tool, only inside the browser.
- */
-
-
-/**
- * Reporter info string
- */
-
-exports.info = "Browser-based test reporter";
-
-
-/**
- * Run all tests within each module, reporting the results
- *
- * @param {Array} files
- * @api public
- */
-
-exports.run = function (modules, options, callback) {
-    var start = new Date().getTime(), div;
-	options = options || {};
-	div = options.div || document.body;
-
-    function setText(el, txt) {
-        if ('innerText' in el) {
-            el.innerText = txt;
-        }
-        else if ('textContent' in el){
-            el.textContent = txt;
-        }
-    }
-
-    function getOrCreate(tag, id) {
-        var el = document.getElementById(id);
-        if (!el) {
-            el = document.createElement(tag);
-            el.id = id;
-            div.appendChild(el);
-        }
-        return el;
-    };
-
-    var header = getOrCreate('h1', 'nodeunit-header');
-    var banner = getOrCreate('h2', 'nodeunit-banner');
-    var userAgent = getOrCreate('h2', 'nodeunit-userAgent');
-    var tests = getOrCreate('ol', 'nodeunit-tests');
-    var result = getOrCreate('p', 'nodeunit-testresult');
-
-    setText(userAgent, navigator.userAgent);
-
-    nodeunit.runModules(modules, {
-        moduleStart: function (name) {
-            /*var mheading = document.createElement('h2');
-            mheading.innerText = name;
-            results.appendChild(mheading);
-            module = document.createElement('ol');
-            results.appendChild(module);*/
-        },
-        testDone: function (name, assertions) {
-            var test = document.createElement('li');
-            var strong = document.createElement('strong');
-            strong.innerHTML = name + ' <b style="color: black;">(' +
-                '<b class="fail">' + assertions.failures() + '</b>, ' +
-                '<b class="pass">' + assertions.passes() + '</b>, ' +
-                assertions.length +
-            ')</b>';
-            test.className = assertions.failures() ? 'fail': 'pass';
-            test.appendChild(strong);
-
-            var aList = document.createElement('ol');
-            aList.style.display = 'none';
-            test.onclick = function () {
-                var d = aList.style.display;
-                aList.style.display = (d == 'none') ? 'block': 'none';
-            };
-            for (var i=0; i<assertions.length; i++) {
-                var li = document.createElement('li');
-                var a = assertions[i];
-                if (a.failed()) {
-                    li.innerHTML = (a.message || a.method || 'no message') +
-                        '<pre>' + (a.error.stack || a.error) + '</pre>';
-                    li.className = 'fail';
-                }
-                else {
-                    li.innerHTML = a.message || a.method || 'no message';
-                    li.className = 'pass';
-                }
-                aList.appendChild(li);
-            }
-            test.appendChild(aList);
-            tests.appendChild(test);
-        },
-        done: function (assertions) {
-            var end = new Date().getTime();
-            var duration = end - start;
-
-            var failures = assertions.failures();
-            banner.className = failures ? 'fail': 'pass';
-
-            result.innerHTML = 'Tests completed in ' + duration +
-                ' milliseconds.<br/><span class="passed">' +
-                assertions.passes() + '</span> assertions of ' +
-                '<span class="all">' + assertions.length + '<span> passed, ' +
-                assertions.failures() + ' failed.';
-
-            if (callback) callback(assertions.failures() ? new Error('We have got test failures.') : undefined);
-        }
-    });
-};
-})(reporter);
-nodeunit = core;
-nodeunit.assert = assert;
-nodeunit.reporter = reporter;
-nodeunit.run = reporter.run;
-return nodeunit; })();
diff --git a/dist/async.js b/dist/async.js
index 2062bea..02b0295 100644
--- a/dist/async.js
+++ b/dist/async.js
@@ -362,8 +362,9 @@
     function once(fn) {
         return function () {
             if (fn === null) return;
-            fn.apply(this, arguments);
+            var callFn = fn;
             fn = null;
+            callFn.apply(this, arguments);
         };
     }
 
@@ -801,8 +802,9 @@
     function onlyOnce(fn) {
         return function () {
             if (fn === null) throw new Error("Callback was already called.");
-            fn.apply(this, arguments);
+            var callFn = fn;
             fn = null;
+            callFn.apply(this, arguments);
         };
     }
 
@@ -867,6 +869,24 @@
         });
     }
 
+    /**
+     * The same as `map` but runs a maximum of `limit` async operations at a time.
+     *
+     * @name mapLimit
+     * @static
+     * @memberOf async
+     * @see async.map
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A function to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, transformed)` which must be called
+     * once it has completed with an error (which can be `null`) and a transformed
+     * item. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Results is an array of the
+     * transformed items from the `coll`. Invoked with (err, results).
+     */
     var mapLimit = doParallelLimit(_asyncMap);
 
     function doLimit(fn, limit) {
@@ -875,20 +895,213 @@
         };
     }
 
+    /**
+     * Produces a new collection of values by mapping each value in `coll` through
+     * the `iteratee` function. The `iteratee` is called with an item from `coll`
+     * and a callback for when it has finished processing. Each of these callback
+     * takes 2 arguments: an `error`, and the transformed item from `coll`. If
+     * `iteratee` passes an error to its callback, the main `callback` (for the
+     * `map` function) is immediately called with the error.
+     *
+     * Note, that since this function applies the `iteratee` to each item in
+     * parallel, there is no guarantee that the `iteratee` functions will complete
+     * in order. However, the results array will be in the same order as the
+     * original `coll`.
+     *
+     * @name map
+     * @static
+     * @memberOf async
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, transformed)` which must be called
+     * once it has completed with an error (which can be `null`) and a
+     * transformed item. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Results is an array of the
+     * transformed items from the `coll`. Invoked with (err, results).
+     * @example
+     *
+     * async.map(['file1','file2','file3'], fs.stat, function(err, results) {
+     *     // results is now an array of stats for each file
+     * });
+     */
     var map = doLimit(mapLimit, Infinity);
 
+    /**
+     * Applies the provided arguments to each function in the array, calling
+     * `callback` after all functions have completed. If you only provide the first
+     * argument, then it will return a function which lets you pass in the
+     * arguments as if it were a single function call.
+     *
+     * @name applyEach
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Array|Object} fns - A collection of asynchronous functions to all
+     * call with the same arguments
+     * @param {...*} [args] - any number of separate arguments to pass to the
+     * function.
+     * @param {Function} [callback] - the final argument should be the callback,
+     * called when all functions have completed processing.
+     * @returns {Function} - If only the first argument is provided, it will return
+     * a function which lets you pass in the arguments as if it were a single
+     * function call.
+     * @example
+     *
+     * async.applyEach([enableSearch, updateSchema], 'bucket', callback);
+     *
+     * // partial application example:
+     * async.each(
+     *     buckets,
+     *     async.applyEach([enableSearch, updateSchema]),
+     *     callback
+     * );
+     */
     var applyEach = applyEach$1(map);
 
+    /**
+     * The same as `map` but runs only a single async operation at a time.
+     *
+     * @name mapSeries
+     * @static
+     * @memberOf async
+     * @see async.map
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, transformed)` which must be called
+     * once it has completed with an error (which can be `null`) and a
+     * transformed item. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Results is an array of the
+     * transformed items from the `coll`. Invoked with (err, results).
+     */
     var mapSeries = doLimit(mapLimit, 1);
 
+    /**
+     * The same as `applyEach` but runs only a single async operation at a time.
+     *
+     * @name applyEachSeries
+     * @static
+     * @memberOf async
+     * @see async.applyEach
+     * @category Control Flow
+     * @param {Array|Object} fns - A collection of asynchronous functions to all
+     * call with the same arguments
+     * @param {...*} [args] - any number of separate arguments to pass to the
+     * function.
+     * @param {Function} [callback] - the final argument should be the callback,
+     * called when all functions have completed processing.
+     * @returns {Function} - If only the first argument is provided, it will return
+     * a function which lets you pass in the arguments as if it were a single
+     * function call.
+     */
     var applyEachSeries = applyEach$1(mapSeries);
 
+    /**
+     * Creates a continuation function with some arguments already applied.
+     *
+     * Useful as a shorthand when combined with other control flow functions. Any
+     * arguments passed to the returned function are added to the arguments
+     * originally passed to apply.
+     *
+     * @name apply
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {Function} function - The function you want to eventually apply all
+     * arguments to. Invokes with (arguments...).
+     * @param {...*} arguments... - Any number of arguments to automatically apply
+     * when the continuation is called.
+     * @example
+     *
+     * // using apply
+     * async.parallel([
+     *     async.apply(fs.writeFile, 'testfile1', 'test1'),
+     *     async.apply(fs.writeFile, 'testfile2', 'test2')
+     * ]);
+     *
+     *
+     * // the same process without using apply
+     * async.parallel([
+     *     function(callback) {
+     *         fs.writeFile('testfile1', 'test1', callback);
+     *     },
+     *     function(callback) {
+     *         fs.writeFile('testfile2', 'test2', callback);
+     *     }
+     * ]);
+     *
+     * // It's possible to pass any number of additional arguments when calling the
+     * // continuation:
+     *
+     * node> var fn = async.apply(sys.puts, 'one');
+     * node> fn('two', 'three');
+     * one
+     * two
+     * three
+     */
     var apply$1 = rest(function (fn, args) {
         return rest(function (callArgs) {
             return fn.apply(null, args.concat(callArgs));
         });
     });
 
+    /**
+     * Take a sync function and make it async, passing its return value to a
+     * callback. This is useful for plugging sync functions into a waterfall,
+     * series, or other async functions. Any arguments passed to the generated
+     * function will be passed to the wrapped function (except for the final
+     * callback argument). Errors thrown will be passed to the callback.
+     *
+     * If the function passed to `asyncify` returns a Promise, that promises's
+     * resolved/rejected state will be used to call the callback, rather than simply
+     * the synchronous return value.
+     *
+     * This also means you can asyncify ES2016 `async` functions.
+     *
+     * @name asyncify
+     * @static
+     * @memberOf async
+     * @alias wrapSync
+     * @category Util
+     * @param {Function} func - The synchronous function to convert to an
+     * asynchronous function.
+     * @returns {Function} An asynchronous wrapper of the `func`. To be invoked with
+     * (callback).
+     * @example
+     *
+     * // passing a regular synchronous function
+     * async.waterfall([
+     *     async.apply(fs.readFile, filename, "utf8"),
+     *     async.asyncify(JSON.parse),
+     *     function (data, next) {
+     *         // data is the result of parsing the text.
+     *         // If there was a parsing error, it would have been caught.
+     *     }
+     * ], callback);
+     *
+     * // passing a function returning a promise
+     * async.waterfall([
+     *     async.apply(fs.readFile, filename, "utf8"),
+     *     async.asyncify(function (contents) {
+     *         return db.model.create(contents);
+     *     }),
+     *     function (model, next) {
+     *         // `model` is the instantiated model object.
+     *         // If there was an error, this function would be skipped.
+     *     }
+     * ], callback);
+     *
+     * // es6 example
+     * var q = async.queue(async.asyncify(async function(file) {
+     *     var intermediateStep = await processFile(file);
+     *     return await somePromise(intermediateStep)
+     * }));
+     *
+     * q.push(files);
+     */
     function asyncify(func) {
         return initialParams(function (args, callback) {
             var result;
@@ -2766,6 +2979,83 @@
       return -1;
     }
 
+    /**
+     * Determines the best order for running the functions in `tasks`, based on
+     * their requirements. Each function can optionally depend on other functions
+     * being completed first, and each function is run as soon as its requirements
+     * are satisfied.
+     *
+     * If any of the functions pass an error to their callback, the `auto` sequence
+     * will stop. Further tasks will not execute (so any other functions depending
+     * on it will not run), and the main `callback` is immediately called with the
+     * error.
+     *
+     * Functions also receive an object containing the results of functions which
+     * have completed so far as the first argument, if they have dependencies. If a
+     * task function has no dependencies, it will only be passed a callback.
+     *
+     * @name auto
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Object} tasks - An object. Each of its properties is either a
+     * function or an array of requirements, with the function itself the last item
+     * in the array. The object's key of a property serves as the name of the task
+     * defined by that property, i.e. can be used when specifying requirements for
+     * other tasks. The function receives one or two arguments:
+     * * a `results` object, containing the results of the previously executed
+     *   functions, only passed if the task has any dependencies,
+     * * a `callback(err, result)` function, which must be called when finished,
+     *   passing an `error` (which can be `null`) and the result of the function's
+     *   execution.
+     * @param {number} [concurrency=Infinity] - An optional `integer` for
+     * determining the maximum number of tasks that can be run in parallel. By
+     * default, as many as possible.
+     * @param {Function} [callback] - An optional callback which is called when all
+     * the tasks have been completed. It receives the `err` argument if any `tasks`
+     * pass an error to their callback. Results are always returned; however, if an
+     * error occurs, no further `tasks` will be performed, and the results object
+     * will only contain partial results. Invoked with (err, results).
+     * @example
+     *
+     * async.auto({
+     *     // this function will just be passed a callback
+     *     readData: async.apply(fs.readFile, 'data.txt', 'utf-8'),
+     *     showData: ['readData', function(results, cb) {
+     *         // results.readData is the file's contents
+     *         // ...
+     *     }]
+     * }, callback);
+     *
+     * async.auto({
+     *     get_data: function(callback) {
+     *         console.log('in get_data');
+     *         // async code to get some data
+     *         callback(null, 'data', 'converted to array');
+     *     },
+     *     make_folder: function(callback) {
+     *         console.log('in make_folder');
+     *         // async code to create a directory to store a file in
+     *         // this is run at the same time as getting the data
+     *         callback(null, 'folder');
+     *     },
+     *     write_file: ['get_data', 'make_folder', function(results, callback) {
+     *         console.log('in write_file', JSON.stringify(results));
+     *         // once there is some data and the directory exists,
+     *         // write the data to a file in the directory
+     *         callback(null, 'filename');
+     *     }],
+     *     email_link: ['write_file', function(results, callback) {
+     *         console.log('in email_link', JSON.stringify(results));
+     *         // once the file is written let's email a link to it...
+     *         // results.write_file contains the filename returned by write_file.
+     *         callback(null, {'file':results.write_file, 'email':'user@example.com'});
+     *     }]
+     * }, function(err, results) {
+     *     console.log('err = ', err);
+     *     console.log('results = ', results);
+     * });
+     */
     function auto (tasks, concurrency, callback) {
         if (typeof concurrency === 'function') {
             // concurrency is optional, shift the args.
@@ -2790,32 +3080,31 @@
 
         var readyTasks = [];
 
+        // for cycle detection:
+        var readyToCheck = []; // tasks that have been identified as reachable
+        // without the possibility of returning to an ancestor task
+        var uncheckedDependencies = {};
+
         forOwn(tasks, function (task, key) {
             if (!isArray(task)) {
                 // no dependencies
                 enqueueTask(key, [task]);
+                readyToCheck.push(key);
                 return;
             }
 
             var dependencies = task.slice(0, task.length - 1);
             var remainingDependencies = dependencies.length;
-
-            checkForDeadlocks();
-
-            function checkForDeadlocks() {
-                var len = dependencies.length;
-                var dep;
-                while (len--) {
-                    if (!(dep = tasks[dependencies[len]])) {
-                        throw new Error('async.auto task `' + key + '` has non-existent dependency in ' + dependencies.join(', '));
-                    }
-                    if (isArray(dep) && baseIndexOf(dep, key, 0) >= 0) {
-                        throw new Error('async.auto task `' + key + '`Has cyclic dependencies');
-                    }
-                }
+            if (!remainingDependencies) {
+                enqueueTask(key, [task]);
+                readyToCheck.push(key);
             }
+            uncheckedDependencies[key] = remainingDependencies;
 
             arrayEach(dependencies, function (dependencyName) {
+                if (!tasks[dependencyName]) {
+                    throw new Error('async.auto task `' + key + '` has a non-existent dependency in ' + dependencies.join(', '));
+                }
                 addListener(dependencyName, function () {
                     remainingDependencies--;
                     if (remainingDependencies === 0) {
@@ -2825,6 +3114,7 @@
             });
         });
 
+        checkForDeadlocks();
         processQueue();
 
         function enqueueTask(key, task) {
@@ -2892,6 +3182,37 @@
                 taskFn(taskCallback);
             }
         }
+
+        function checkForDeadlocks() {
+            // Kahn's algorithm
+            // https://en.wikipedia.org/wiki/Topological_sorting#Kahn.27s_algorithm
+            // http://connalle.blogspot.com/2013/10/topological-sortingkahn-algorithm.html
+            var currentTask;
+            var counter = 0;
+            while (readyToCheck.length) {
+                currentTask = readyToCheck.pop();
+                counter++;
+                arrayEach(getDependents(currentTask), function (dependent) {
+                    if (! --uncheckedDependencies[dependent]) {
+                        readyToCheck.push(dependent);
+                    }
+                });
+            }
+
+            if (counter !== numTasks) {
+                throw new Error('async.auto cannot execute tasks due to a recursive dependency');
+            }
+        }
+
+        function getDependents(taskName) {
+            var result = [];
+            forOwn(tasks, function (task, key) {
+                if (isArray(task) && baseIndexOf(task, taskName, 0) >= 0) {
+                    result.push(key);
+                }
+            });
+            return result;
+        }
     }
 
     /**
@@ -2919,6 +3240,92 @@
         return func.toString().match(argsRegex)[1].split(/\s*\,\s*/);
     }
 
+    /**
+     * A dependency-injected version of the {@link async.auto} function. Dependent
+     * tasks are specified as parameters to the function, after the usual callback
+     * parameter, with the parameter names matching the names of the tasks it
+     * depends on. This can provide even more readable task graphs which can be
+     * easier to maintain.
+     *
+     * If a final callback is specified, the task results are similarly injected,
+     * specified as named parameters after the initial error parameter.
+     *
+     * The autoInject function is purely syntactic sugar and its semantics are
+     * otherwise equivalent to {@link async.auto}.
+     *
+     * @name autoInject
+     * @static
+     * @memberOf async
+     * @see async.auto
+     * @category Control Flow
+     * @param {Object} tasks - An object, each of whose properties is a function of
+     * the form 'func([dependencies...], callback). The object's key of a property
+     * serves as the name of the task defined by that property, i.e. can be used
+     * when specifying requirements for other tasks.
+     * * The `callback` parameter is a `callback(err, result)` which must be called
+     *   when finished, passing an `error` (which can be `null`) and the result of
+     *   the function's execution. The remaining parameters name other tasks on
+     *   which the task is dependent, and the results from those tasks are the
+     *   arguments of those parameters.
+     * @param {Function} [callback] - An optional callback which is called when all
+     * the tasks have been completed. It receives the `err` argument if any `tasks`
+     * pass an error to their callback. The remaining parameters are task names
+     * whose results you are interested in. This callback will only be called when
+     * all tasks have finished or an error has occurred, and so do not specify
+     * dependencies in the same way as `tasks` do. If an error occurs, no further
+     * `tasks` will be performed, and `results` will only be valid for those tasks
+     * which managed to complete. Invoked with (err, [results...]).
+     * @example
+     *
+     * //  The example from `auto` can be rewritten as follows:
+     * async.autoInject({
+     *     get_data: function(callback) {
+     *         // async code to get some data
+     *         callback(null, 'data', 'converted to array');
+     *     },
+     *     make_folder: function(callback) {
+     *         // async code to create a directory to store a file in
+     *         // this is run at the same time as getting the data
+     *         callback(null, 'folder');
+     *     },
+     *     write_file: function(get_data, make_folder, callback) {
+     *         // once there is some data and the directory exists,
+     *         // write the data to a file in the directory
+     *         callback(null, 'filename');
+     *     },
+     *     email_link: function(write_file, callback) {
+     *         // once the file is written let's email a link to it...
+     *         // write_file contains the filename returned by write_file.
+     *         callback(null, {'file':write_file, 'email':'user@example.com'});
+     *     }
+     * }, function(err, email_link) {
+     *     console.log('err = ', err);
+     *     console.log('email_link = ', email_link);
+     * });
+     *
+     * // If you are using a JS minifier that mangles parameter names, `autoInject`
+     * // will not work with plain functions, since the parameter names will be
+     * // collapsed to a single letter identifier.  To work around this, you can
+     * // explicitly specify the names of the parameters your task function needs
+     * // in an array, similar to Angular.js dependency injection.  The final
+     * // results callback can be provided as an array in the same way.
+     *
+     * // This still has an advantage over plain `auto`, since the results a task
+     * // depends on are still spread into arguments.
+     * async.autoInject({
+     *     //...
+     *     write_file: ['get_data', 'make_folder', function(get_data, make_folder, callback) {
+     *         callback(null, 'filename');
+     *     }],
+     *     email_link: ['write_file', function(write_file, callback) {
+     *         callback(null, {'file':write_file, 'email':'user@example.com'});
+     *     }]
+     *     //...
+     * }, ['email_link', function(err, email_link) {
+     *     console.log('err = ', err);
+     *     console.log('email_link = ', email_link);
+     * }]);
+     */
     function autoInject(tasks, callback) {
         var newTasks = {};
 
@@ -2951,23 +3358,7 @@
             }
         });
 
-        auto(newTasks, function (err, results) {
-            var params;
-            if (isArray(callback)) {
-                params = copyArray(callback);
-                callback = params.pop();
-            } else {
-                params = parseParams(callback);
-                params.shift();
-            }
-
-            params = arrayMap(params, function (name) {
-                return results[name];
-            });
-
-            params.unshift(err);
-            callback.apply(null, params);
-        });
+        auto(newTasks, callback);
     }
 
     var _setImmediate = typeof setImmediate === 'function' && setImmediate;
@@ -3126,16 +3517,169 @@
         return q;
     }
 
+    /**
+     * A cargo of tasks for the worker function to complete. Cargo inherits all of
+     * the same methods and event callbacks as {@link async.queue}.
+     * @typedef {Object} cargo
+     * @property {Function} length - A function returning the number of items
+     * waiting to be processed. Invoke with ().
+     * @property {number} payload - An `integer` for determining how many tasks
+     * should be process per round. This property can be changed after a `cargo` is
+     * created to alter the payload on-the-fly.
+     * @property {Function} push - Adds `task` to the `queue`. The callback is
+     * called once the `worker` has finished processing the task. Instead of a
+     * single task, an array of `tasks` can be submitted. The respective callback is
+     * used for every task in the list. Invoke with (task, [callback]).
+     * @property {Function} saturated - A callback that is called when the
+     * `queue.length()` hits the concurrency and further tasks will be queued.
+     * @property {Function} empty - A callback that is called when the last item
+     * from the `queue` is given to a `worker`.
+     * @property {Function} drain - A callback that is called when the last item
+     * from the `queue` has returned from the `worker`.
+     * @property {Function} idle - a function returning false if there are items
+     * waiting or being processed, or true if not. Invoke with ().
+     * @property {Function} pause - a function that pauses the processing of tasks
+     * until `resume()` is called. Invoke with ().
+     * @property {Function} resume - a function that resumes the processing of
+     * queued tasks when the queue is paused. Invoke with ().
+     * @property {Function} kill - a function that removes the `drain` callback and
+     * empties remaining tasks from the queue forcing it to go idle. Invoke with ().
+     */
+
+    /**
+     * Creates a `cargo` object with the specified payload. Tasks added to the
+     * cargo will be processed altogether (up to the `payload` limit). If the
+     * `worker` is in progress, the task is queued until it becomes available. Once
+     * the `worker` has completed some tasks, each callback of those tasks is
+     * called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
+     * for how `cargo` and `queue` work.
+     *
+     * While [queue](#queue) passes only one task to one of a group of workers
+     * at a time, cargo passes an array of tasks to a single worker, repeating
+     * when the worker is finished.
+     *
+     * @name cargo
+     * @static
+     * @memberOf async
+     * @see async.queue
+     * @category Control Flow
+     * @param {Function} worker - An asynchronous function for processing an array
+     * of queued tasks, which must call its `callback(err)` argument when finished,
+     * with an optional `err` argument. Invoked with (tasks, callback).
+     * @param {number} [payload=Infinity] - An optional `integer` for determining
+     * how many tasks should be processed per round; if omitted, the default is
+     * unlimited.
+     * @returns {cargo} A cargo object to manage the tasks. Callbacks can
+     * attached as certain properties to listen for specific events during the
+     * lifecycle of the cargo and inner queue.
+     * @example
+     *
+     * // create a cargo object with payload 2
+     * var cargo = async.cargo(function(tasks, callback) {
+     *     for (var i=0; i<tasks.length; i++) {
+     *         console.log('hello ' + tasks[i].name);
+     *     }
+     *     callback();
+     * }, 2);
+     *
+     * // add some items
+     * cargo.push({name: 'foo'}, function(err) {
+     *     console.log('finished processing foo');
+     * });
+     * cargo.push({name: 'bar'}, function(err) {
+     *     console.log('finished processing bar');
+     * });
+     * cargo.push({name: 'baz'}, function(err) {
+     *     console.log('finished processing baz');
+     * });
+     */
     function cargo(worker, payload) {
-        return queue(worker, 1, payload);
+      return queue(worker, 1, payload);
     }
 
+    /**
+     * The same as `eachOf` but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name eachOfLimit
+     * @static
+     * @memberOf async
+     * @see async.eachOf
+     * @alias forEachOfLimit
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A function to apply to each
+     * item in `coll`. The `key` is the item's key, or index in the case of an
+     * array. The iteratee is passed a `callback(err)` which must be called once it
+     * has completed. If no error has occurred, the callback should be run without
+     * arguments or with an explicit `null` argument. Invoked with
+     * (item, key, callback).
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     */
     function eachOfLimit(obj, limit, iteratee, cb) {
-        _eachOfLimit(limit)(obj, iteratee, cb);
+      _eachOfLimit(limit)(obj, iteratee, cb);
     }
 
+    /**
+     * The same as `eachOf` but runs only a single async operation at a time.
+     *
+     * @name eachOfSeries
+     * @static
+     * @memberOf async
+     * @see async.eachOf
+     * @alias forEachOfSeries
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each item in `coll`. The
+     * `key` is the item's key, or index in the case of an array. The iteratee is
+     * passed a `callback(err)` which must be called once it has completed. If no
+     * error has occurred, the callback should be run without arguments or with an
+     * explicit `null` argument. Invoked with (item, key, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Invoked with (err).
+     */
     var eachOfSeries = doLimit(eachOfLimit, 1);
 
+    /**
+     * Reduces `coll` into a single value using an async `iteratee` to return each
+     * successive step. `memo` is the initial state of the reduction. This function
+     * only operates in series.
+     *
+     * For performance reasons, it may make sense to split a call to this function
+     * into a parallel map, and then use the normal `Array.prototype.reduce` on the
+     * results. This function is for situations where each step in the reduction
+     * needs to be async; if you can get the data before reducing it, then it's
+     * probably a good idea to do so.
+     *
+     * @name reduce
+     * @static
+     * @memberOf async
+     * @alias inject, foldl
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {*} memo - The initial state of the reduction.
+     * @param {Function} iteratee - A function applied to each item in the
+     * array to produce the next step in the reduction. The `iteratee` is passed a
+     * `callback(err, reduction)` which accepts an optional error as its first
+     * argument, and the state of the reduction as the second. If an error is
+     * passed to the callback, the reduction is stopped and the main `callback` is
+     * immediately called with the error. Invoked with (memo, item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result is the reduced value. Invoked with
+     * (err, result).
+     * @example
+     *
+     * async.reduce([1,2,3], 0, function(memo, item, callback) {
+     *     // pointless async:
+     *     process.nextTick(function() {
+     *         callback(null, memo + item)
+     *     });
+     * }, function(err, result) {
+     *     // result is now equal to the last value of memo, which is 6
+     * });
+     */
     function reduce(arr, memo, iteratee, cb) {
         eachOfSeries(arr, function (x, i, cb) {
             iteratee(memo, x, function (err, v) {
@@ -3147,6 +3691,42 @@
         });
     }
 
+    /**
+     * Version of the compose function that is more natural to read. Each function
+     * consumes the return value of the previous function. It is the equivalent of
+     * {@link async.compose} with the arguments reversed.
+     *
+     * Each function is executed with the `this` binding of the composed function.
+     *
+     * @name seq
+     * @static
+     * @memberOf async
+     * @see async.compose
+     * @category Control Flow
+     * @param {...Function} functions - the asynchronous functions to compose
+     * @example
+     *
+     * // Requires lodash (or underscore), express3 and dresende's orm2.
+     * // Part of an app, that fetches cats of the logged user.
+     * // This example uses `seq` function to avoid overnesting and error
+     * // handling clutter.
+     * app.get('/cats', function(request, response) {
+     *     var User = request.models.User;
+     *     async.seq(
+     *         _.bind(User.get, User),  // 'User.get' has signature (id, callback(err, data))
+     *         function(user, fn) {
+     *             user.getCats(fn);      // 'getCats' has signature (callback(err, data))
+     *         }
+     *     )(req.session.user_id, function (err, cats) {
+     *         if (err) {
+     *             console.error(err);
+     *             response.json({ status: 'error', message: err.message });
+     *         } else {
+     *             response.json({ status: 'ok', message: 'Cats found', data: cats });
+     *         }
+     *     });
+     * });
+     */
     function seq() /* functions... */{
         var fns = arguments;
         return rest(function (args) {
@@ -3171,8 +3751,40 @@
 
     var reverse = Array.prototype.reverse;
 
+    /**
+     * Creates a function which is a composition of the passed asynchronous
+     * functions. Each function consumes the return value of the function that
+     * follows. Composing functions `f()`, `g()`, and `h()` would produce the result
+     * of `f(g(h()))`, only this version uses callbacks to obtain the return values.
+     *
+     * Each function is executed with the `this` binding of the composed function.
+     *
+     * @name compose
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {...Function} functions - the asynchronous functions to compose
+     * @example
+     *
+     * function add1(n, callback) {
+     *     setTimeout(function () {
+     *         callback(null, n + 1);
+     *     }, 10);
+     * }
+     *
+     * function mul3(n, callback) {
+     *     setTimeout(function () {
+     *         callback(null, n * 3);
+     *     }, 10);
+     * }
+     *
+     * var add1mul3 = async.compose(mul3, add1);
+     * add1mul3(4, function (err, result) {
+     *     // result now equals 15
+     * });
+     */
     function compose() /* functions... */{
-        return seq.apply(null, reverse.call(arguments));
+      return seq.apply(null, reverse.call(arguments));
     }
 
     function concat$1(eachfn, arr, fn, callback) {
@@ -3187,6 +3799,45 @@
         });
     }
 
+    /**
+     * Like `each`, except that it passes the key (or index) as the second argument
+     * to the iteratee.
+     *
+     * @name eachOf
+     * @static
+     * @memberOf async
+     * @alias forEachOf
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each
+     * item in `coll`. The `key` is the item's key, or index in the case of an
+     * array. The iteratee is passed a `callback(err)` which must be called once it
+     * has completed. If no error has occurred, the callback should be run without
+     * arguments or with an explicit `null` argument. Invoked with
+     * (item, key, callback).
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     * @example
+     *
+     * var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"};
+     * var configs = {};
+     *
+     * async.forEachOf(obj, function (value, key, callback) {
+     *     fs.readFile(__dirname + value, "utf8", function (err, data) {
+     *         if (err) return callback(err);
+     *         try {
+     *             configs[key] = JSON.parse(data);
+     *         } catch (e) {
+     *             return callback(e);
+     *         }
+     *         callback();
+     *     });
+     * }, function (err) {
+     *     if (err) console.error(err.message);
+     *     // configs is now a map of JSON data
+     *     doSomethingWith(configs);
+     * });
+     */
     var eachOf = doLimit(eachOfLimit, Infinity);
 
     function doParallel(fn) {
@@ -3195,6 +3846,32 @@
         };
     }
 
+    /**
+     * Applies `iteratee` to each item in `coll`, concatenating the results. Returns
+     * the concatenated list. The `iteratee`s are called in parallel, and the
+     * results are concatenated as they return. There is no guarantee that the
+     * results array will be returned in the original order of `coll` passed to the
+     * `iteratee` function.
+     *
+     * @name concat
+     * @static
+     * @memberOf async
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, results)` which must be called once
+     * it has completed with an error (which can be `null`) and an array of results.
+     * Invoked with (item, callback).
+     * @param {Function} [callback(err)] - A callback which is called after all the
+     * `iteratee` functions have finished, or an error occurs. Results is an array
+     * containing the concatenated results of the `iteratee` function. Invoked with
+     * (err, results).
+     * @example
+     *
+     * async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
+     *     // files is now a list of filenames that exist in the 3 directories
+     * });
+     */
     var concat = doParallel(concat$1);
 
     function doSeries(fn) {
@@ -3203,8 +3880,67 @@
         };
     }
 
+    /**
+     * The same as `concat` but runs only a single async operation at a time.
+     *
+     * @name concatSeries
+     * @static
+     * @memberOf async
+     * @see async.concat
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, results)` which must be called once
+     * it has completed with an error (which can be `null`) and an array of results.
+     * Invoked with (item, callback).
+     * @param {Function} [callback(err)] - A callback which is called after all the
+     * `iteratee` functions have finished, or an error occurs. Results is an array
+     * containing the concatenated results of the `iteratee` function. Invoked with
+     * (err, results).
+     */
     var concatSeries = doSeries(concat$1);
 
+    /**
+     * Returns a function that when called, calls-back with the values provided.
+     * Useful as the first function in a `waterfall`, or for plugging values in to
+     * `auto`.
+     *
+     * @name constant
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {...*} arguments... - Any number of arguments to automatically invoke
+     * callback with.
+     * @returns {Function} Returns a function that when invoked, automatically
+     * invokes the callback with the previous given arguments.
+     * @example
+     *
+     * async.waterfall([
+     *     async.constant(42),
+     *     function (value, next) {
+     *         // value === 42
+     *     },
+     *     //...
+     * ], callback);
+     *
+     * async.waterfall([
+     *     async.constant(filename, "utf8"),
+     *     fs.readFile,
+     *     function (fileData, next) {
+     *         //...
+     *     }
+     *     //...
+     * ], callback);
+     *
+     * async.auto({
+     *     hostname: async.constant("https://server.net/"),
+     *     port: findFreePort,
+     *     launchServer: ["hostname", "port", function (options, cb) {
+     *         startServer(options, cb);
+     *     }],
+     *     //...
+     * }, callback);
+     */
     var constant = rest(function (values) {
         var args = [null].concat(values);
         return initialParams(function (ignoredArgs, callback) {
@@ -3254,10 +3990,84 @@
         return x;
     }
 
+    /**
+     * Returns the first value in `coll` that passes an async truth test. The
+     * `iteratee` is applied in parallel, meaning the first iteratee to return
+     * `true` will fire the detect `callback` with that result. That means the
+     * result might not be the first item in the original `coll` (in terms of order)
+     * that passes the test.
+
+     * If order within the original `coll` is important, then look at
+     * `detectSeries`.
+     *
+     * @name detect
+     * @static
+     * @memberOf async
+     * @alias find
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, truthValue)` which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the `iteratee` functions have finished.
+     * Result will be the first item in the array that passes the truth test
+     * (iteratee) or the value `undefined` if none passed. Invoked with
+     * (err, result).
+     * @example
+     *
+     * async.detect(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, result) {
+     *     // result now equals the first file in the list that exists
+     * });
+     */
     var detect = _createTester(eachOf, identity, _findGetResult);
 
+    /**
+     * The same as `detect` but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name detectLimit
+     * @static
+     * @memberOf async
+     * @see async.detect
+     * @alias findLimit
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, truthValue)` which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the `iteratee` functions have finished.
+     * Result will be the first item in the array that passes the truth test
+     * (iteratee) or the value `undefined` if none passed. Invoked with
+     * (err, result).
+     */
     var detectLimit = _createTester(eachOfLimit, identity, _findGetResult);
 
+    /**
+     * The same as `detect` but runs only a single async operation at a time.
+     *
+     * @name detectSeries
+     * @static
+     * @memberOf async
+     * @see async.detect
+     * @alias findSeries
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, truthValue)` which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the `iteratee` functions have finished.
+     * Result will be the first item in the array that passes the truth test
+     * (iteratee) or the value `undefined` if none passed. Invoked with
+     * (err, result).
+     */
     var detectSeries = _createTester(eachOfSeries, identity, _findGetResult);
 
     function consoleFunc(name) {
@@ -3278,8 +4088,72 @@
         });
     }
 
+    /**
+     * Logs the result of an `async` function to the `console` using `console.dir`
+     * to display the properties of the resulting object. Only works in Node.js or
+     * in browsers that support `console.dir` and `console.error` (such as FF and
+     * Chrome). If multiple arguments are returned from the async function,
+     * `console.dir` is called on each argument in order.
+     *
+     * @name log
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {Function} function - The function you want to eventually apply all
+     * arguments to.
+     * @param {...*} arguments... - Any number of arguments to apply to the function.
+     * @example
+     *
+     * // in a module
+     * var hello = function(name, callback) {
+     *     setTimeout(function() {
+     *         callback(null, {hello: name});
+     *     }, 1000);
+     * };
+     *
+     * // in the node repl
+     * node> async.dir(hello, 'world');
+     * {hello: 'world'}
+     */
     var dir = consoleFunc('dir');
 
+    /**
+     * Like {@link async.whilst}, except the `test` is an asynchronous function that
+     * is passed a callback in the form of `function (err, truth)`. If error is
+     * passed to `test` or `fn`, the main callback is immediately called with the
+     * value of the error.
+     *
+     * @name during
+     * @static
+     * @memberOf async
+     * @see async.whilst
+     * @category Control Flow
+     * @param {Function} test - asynchronous truth test to perform before each
+     * execution of `fn`. Invoked with (callback).
+     * @param {Function} fn - A function which is called each time `test` passes.
+     * The function is passed a `callback(err)`, which must be called once it has
+     * completed with an optional `err` argument. Invoked with (callback).
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has failed and repeated execution of `fn` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `fn`'s
+     * callback. Invoked with (err, [results]);
+     * @example
+     *
+     * var count = 0;
+     *
+     * async.during(
+     *     function (callback) {
+     *         return callback(null, count < 5);
+     *     },
+     *     function (callback) {
+     *         count++;
+     *         setTimeout(callback, 1000);
+     *     },
+     *     function (err) {
+     *         // 5 seconds have passed
+     *     }
+     * );
+     */
     function during(test, iteratee, cb) {
         cb = cb || noop;
 
@@ -3301,6 +4175,26 @@
         test(check);
     }
 
+    /**
+     * The post-check version of {@link async.during}. To reflect the difference in
+     * the order of operations, the arguments `test` and `fn` are switched.
+     *
+     * Also a version of {@link async.doWhilst} with asynchronous `test` function.
+     * @name doDuring
+     * @static
+     * @memberOf async
+     * @see async.during
+     * @category Control Flow
+     * @param {Function} fn - A function which is called each time `test` passes.
+     * The function is passed a `callback(err)`, which must be called once it has
+     * completed with an optional `err` argument. Invoked with (callback).
+     * @param {Function} test - asynchronous truth test to perform before each
+     * execution of `fn`. Invoked with (callback).
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has failed and repeated execution of `fn` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `fn`'s
+     * callback. Invoked with (err, [results]);
+     */
     function doDuring(iteratee, test, cb) {
         var calls = 0;
 
@@ -3310,6 +4204,39 @@
         }, iteratee, cb);
     }
 
+    /**
+     * Repeatedly call `fn`, while `test` returns `true`. Calls `callback` when
+     * stopped, or an error occurs.
+     *
+     * @name whilst
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Function} test - synchronous truth test to perform before each
+     * execution of `fn`. Invoked with ().
+     * @param {Function} fn - A function which is called each time `test` passes.
+     * The function is passed a `callback(err)`, which must be called once it has
+     * completed with an optional `err` argument. Invoked with (callback).
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has failed and repeated execution of `fn` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `fn`'s
+     * callback. Invoked with (err, [results]);
+     * @example
+     *
+     * var count = 0;
+     * async.whilst(
+     *     function() { return count < 5; },
+     *     function(callback) {
+     *         count++;
+     *         setTimeout(function() {
+     *             callback(null, count);
+     *         }, 1000);
+     *     },
+     *     function (err, n) {
+     *         // 5 seconds have passed, n = 5
+     *     }
+     * );
+     */
     function whilst(test, iteratee, cb) {
         cb = cb || noop;
         if (!test()) return cb(null);
@@ -3321,6 +4248,27 @@
         iteratee(next);
     }
 
+    /**
+     * The post-check version of {@link async.whilst}. To reflect the difference in
+     * the order of operations, the arguments `test` and `fn` are switched.
+     *
+     * `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
+     *
+     * @name doWhilst
+     * @static
+     * @memberOf async
+     * @see async.whilst
+     * @category Control Flow
+     * @param {Function} fn - A function which is called each time `test` passes.
+     * The function is passed a `callback(err)`, which must be called once it has
+     * completed with an optional `err` argument. Invoked with (callback).
+     * @param {Function} test - synchronous truth test to perform before each
+     * execution of `fn`. Invoked with ().
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has failed and repeated execution of `fn` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `fn`'s
+     * callback. Invoked with (err, [results]);
+     */
     function doWhilst(iteratee, test, cb) {
         var calls = 0;
         return whilst(function () {
@@ -3328,6 +4276,25 @@
         }, iteratee, cb);
     }
 
+    /**
+     * Like {@link async.doWhilst}, except the `test` is inverted. Note the
+     * argument ordering differs from `until`.
+     *
+     * @name doUntil
+     * @static
+     * @memberOf async
+     * @see async.doWhilst
+     * @category Control Flow
+     * @param {Function} fn - A function which is called each time `test` fails.
+     * The function is passed a `callback(err)`, which must be called once it has
+     * completed with an optional `err` argument. Invoked with (callback).
+     * @param {Function} test - synchronous truth test to perform before each
+     * execution of `fn`. Invoked with ().
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has passed and repeated execution of `fn` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `fn`'s
+     * callback. Invoked with (err, [results]);
+     */
     function doUntil(iteratee, test, cb) {
         return doWhilst(iteratee, function () {
             return !test.apply(this, arguments);
@@ -3340,14 +4307,144 @@
         };
     }
 
+    /**
+     * The same as `each` but runs a maximum of `limit` async operations at a time.
+     *
+     * @name eachLimit
+     * @static
+     * @memberOf async
+     * @see async.each
+     * @alias forEachLimit
+     * @category Collection
+     * @param {Array|Object} coll - A colleciton to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A function to apply to each item in `coll`. The
+     * iteratee is passed a `callback(err)` which must be called once it has
+     * completed. If no error has occurred, the `callback` should be run without
+     * arguments or with an explicit `null` argument. The array index is not passed
+     * to the iteratee. Invoked with (item, callback). If you need the index, use
+     * `eachOfLimit`.
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     */
     function eachLimit(arr, limit, iteratee, cb) {
-        return _eachOfLimit(limit)(arr, _withoutIndex(iteratee), cb);
+      return _eachOfLimit(limit)(arr, _withoutIndex(iteratee), cb);
     }
 
+    /**
+     * Applies the function `iteratee` to each item in `coll`, in parallel.
+     * The `iteratee` is called with an item from the list, and a callback for when
+     * it has finished. If the `iteratee` passes an error to its `callback`, the
+     * main `callback` (for the `each` function) is immediately called with the
+     * error.
+     *
+     * Note, that since this function applies `iteratee` to each item in parallel,
+     * there is no guarantee that the iteratee functions will complete in order.
+     *
+     * @name each
+     * @static
+     * @memberOf async
+     * @alias forEach
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each item
+     * in `coll`. The iteratee is passed a `callback(err)` which must be called once
+     * it has completed. If no error has occurred, the `callback` should be run
+     * without arguments or with an explicit `null` argument. The array index is not
+     * passed to the iteratee. Invoked with (item, callback). If you need the index,
+     * use `eachOf`.
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     * @example
+     *
+     * // assuming openFiles is an array of file names and saveFile is a function
+     * // to save the modified contents of that file:
+     *
+     * async.each(openFiles, saveFile, function(err){
+     *   // if any of the saves produced an error, err would equal that error
+     * });
+     *
+     * // assuming openFiles is an array of file names
+     * async.each(openFiles, function(file, callback) {
+     *
+     *     // Perform operation on file here.
+     *     console.log('Processing file ' + file);
+     *
+     *     if( file.length > 32 ) {
+     *       console.log('This file name is too long');
+     *       callback('File name too long');
+     *     } else {
+     *       // Do work to process file here
+     *       console.log('File processed');
+     *       callback();
+     *     }
+     * }, function(err) {
+     *     // if any of the file processing produced an error, err would equal that error
+     *     if( err ) {
+     *       // One of the iterations produced an error.
+     *       // All processing will now stop.
+     *       console.log('A file failed to process');
+     *     } else {
+     *       console.log('All files have been processed successfully');
+     *     }
+     * });
+     */
     var each = doLimit(eachLimit, Infinity);
 
+    /**
+     * The same as `each` but runs only a single async operation at a time.
+     *
+     * @name eachSeries
+     * @static
+     * @memberOf async
+     * @see async.each
+     * @alias forEachSeries
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each
+     * item in `coll`. The iteratee is passed a `callback(err)` which must be called
+     * once it has completed. If no error has occurred, the `callback` should be run
+     * without arguments or with an explicit `null` argument. The array index is
+     * not passed to the iteratee. Invoked with (item, callback). If you need the
+     * index, use `eachOfSeries`.
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     */
     var eachSeries = doLimit(eachLimit, 1);
 
+    /**
+     * Wrap an async function and ensure it calls its callback on a later tick of
+     * the event loop.  If the function already calls its callback on a next tick,
+     * no extra deferral is added. This is useful for preventing stack overflows
+     * (`RangeError: Maximum call stack size exceeded`) and generally keeping
+     * [Zalgo](http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony)
+     * contained.
+     *
+     * @name ensureAsync
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {Function} fn - an async function, one that expects a node-style
+     * callback as its last argument.
+     * @returns {Function} Returns a wrapped function with the exact same call
+     * signature as the function passed in.
+     * @example
+     *
+     * function sometimesAsync(arg, callback) {
+     *     if (cache[arg]) {
+     *         return callback(null, cache[arg]); // this would be synchronous!!
+     *     } else {
+     *         doSomeIO(arg, callback); // this IO would be asynchronous
+     *     }
+     * }
+     *
+     * // this has a risk of stack overflows if many results are cached in a row
+     * async.mapSeries(args, sometimesAsync, done);
+     *
+     * // this will defer sometimesAsync's callback if necessary,
+     * // preventing stack overflows
+     * async.mapSeries(args, async.ensureAsync(sometimesAsync), done);
+     */
     function ensureAsync(fn) {
         return initialParams(function (args, callback) {
             var sync = true;
@@ -3370,10 +4467,74 @@
         return !v;
     }
 
+    /**
+     * The same as `every` but runs a maximum of `limit` async operations at a time.
+     *
+     * @name everyLimit
+     * @static
+     * @memberOf async
+     * @see async.every
+     * @alias allLimit
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A truth test to apply to each item in the
+     * collection in parallel. The iteratee is passed a `callback(err, truthValue)`
+     * which must be called with a  boolean argument once it has completed. Invoked
+     * with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result will be either `true` or `false`
+     * depending on the values of the async tests. Invoked with (err, result).
+     */
     var everyLimit = _createTester(eachOfLimit, notId, notId);
 
+    /**
+     * Returns `true` if every element in `coll` satisfies an async test. If any
+     * iteratee call returns `false`, the main `callback` is immediately called.
+     *
+     * @name every
+     * @static
+     * @memberOf async
+     * @alias all
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in the
+     * collection in parallel. The iteratee is passed a `callback(err, truthValue)`
+     * which must be called with a  boolean argument once it has completed. Invoked
+     * with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result will be either `true` or `false`
+     * depending on the values of the async tests. Invoked with (err, result).
+     * @example
+     *
+     * async.every(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, result) {
+     *     // if result is true then every file exists
+     * });
+     */
     var every = doLimit(everyLimit, Infinity);
 
+    /**
+     * The same as `every` but runs only a single async operation at a time.
+     *
+     * @name everySeries
+     * @static
+     * @memberOf async
+     * @see async.every
+     * @alias allSeries
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in the
+     * collection in parallel. The iteratee is passed a `callback(err, truthValue)`
+     * which must be called with a  boolean argument once it has completed. Invoked
+     * with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result will be either `true` or `false`
+     * depending on the values of the async tests. Invoked with (err, result).
+     */
     var everySeries = doLimit(everyLimit, 1);
 
     function _filter(eachfn, arr, iteratee, callback) {
@@ -3400,12 +4561,100 @@
         });
     }
 
+    /**
+     * The same as `filter` but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name filterLimit
+     * @static
+     * @memberOf async
+     * @see async.filter
+     * @alias selectLimit
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     */
     var filterLimit = doParallelLimit(_filter);
 
+    /**
+     * Returns a new array of all the values in `coll` which pass an async truth
+     * test. This operation is performed in parallel, but the results array will be
+     * in the same order as the original.
+     *
+     * @name filter
+     * @static
+     * @memberOf async
+     * @alias select
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     * @example
+     *
+     * async.filter(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, results) {
+     *     // results now equals an array of the existing files
+     * });
+     */
     var filter = doLimit(filterLimit, Infinity);
 
+    /**
+     * The same as `filter` but runs only a single async operation at a time.
+     *
+     * @name filterSeries
+     * @static
+     * @memberOf async
+     * @see async.filter
+     * @alias selectSeries
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results)
+     */
     var filterSeries = doLimit(filterLimit, 1);
 
+    /**
+     * Calls the asynchronous function `fn` with a callback parameter that allows it
+     * to call itself again, in series, indefinitely.
+
+     * If an error is passed to the
+     * callback then `errback` is called with the error, and execution stops,
+     * otherwise it will never be called.
+     *
+     * @name forever
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Function} fn - a function to call repeatedly. Invoked with (next).
+     * @param {Function} [errback] - when `fn` passes an error to it's callback,
+     * this function will be called, and execution stops. Invoked with (err).
+     * @example
+     *
+     * async.forever(
+     *     function(next) {
+     *         // next is suitable for passing to things that need a callback(err [, whatever]);
+     *         // it will result in this function being called again.
+     *     },
+     *     function(err) {
+     *         // if next is called with a value in its first parameter, it will appear
+     *         // in here as 'err', and execution will stop.
+     *     }
+     * );
+     */
     function forever(fn, cb) {
         var done = onlyOnce(cb || noop);
         var task = ensureAsync(fn);
@@ -3417,6 +4666,39 @@
         next();
     }
 
+    /**
+     * Creates an iterator function which calls the next function in the `tasks`
+     * array, returning a continuation to call the next one after that. It's also
+     * possible to “peek” at the next iterator with `iterator.next()`.
+     *
+     * This function is used internally by the `async` module, but can be useful
+     * when you want to manually control the flow of functions in series.
+     *
+     * @name iterator
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Array} tasks - An array of functions to run.
+     * @returns The next function to run in the series.
+     * @example
+     *
+     * var iterator = async.iterator([
+     *     function() { sys.p('one'); },
+     *     function() { sys.p('two'); },
+     *     function() { sys.p('three'); }
+     * ]);
+     *
+     * node> var iterator2 = iterator();
+     * 'one'
+     * node> var iterator3 = iterator2();
+     * 'two'
+     * node> iterator3();
+     * 'three'
+     * node> var nextfn = iterator2.next();
+     * node> nextfn();
+     * 'three'
+     */
+
     function iterator$1 (tasks) {
         function makeCallback(index) {
             function fn() {
@@ -3433,12 +4715,73 @@
         return makeCallback(0);
     }
 
+    /**
+     * Logs the result of an `async` function to the `console`. Only works in
+     * Node.js or in browsers that support `console.log` and `console.error` (such
+     * as FF and Chrome). If multiple arguments are returned from the async
+     * function, `console.log` is called on each argument in order.
+     *
+     * @name log
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {Function} function - The function you want to eventually apply all
+     * arguments to.
+     * @param {...*} arguments... - Any number of arguments to apply to the function.
+     * @example
+     *
+     * // in a module
+     * var hello = function(name, callback) {
+     *     setTimeout(function() {
+     *         callback(null, 'hello ' + name);
+     *     }, 1000);
+     * };
+     *
+     * // in the node repl
+     * node> async.log(hello, 'world');
+     * 'hello world'
+     */
     var log = consoleFunc('log');
 
     function has(obj, key) {
         return key in obj;
     }
 
+    /**
+     * Caches the results of an `async` function. When creating a hash to store
+     * function results against, the callback is omitted from the hash and an
+     * optional hash function can be used.
+     *
+     * If no hash function is specified, the first argument is used as a hash key,
+     * which may work reasonably if it is a string or a data type that converts to a
+     * distinct string. Note that objects and arrays will not behave reasonably.
+     * Neither will cases where the other arguments are significant. In such cases,
+     * specify your own hash function.
+     *
+     * The cache of results is exposed as the `memo` property of the function
+     * returned by `memoize`.
+     *
+     * @name memoize
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {Function} fn - The function to proxy and cache results from.
+     * @param {Function} hasher - An optional function for generating a custom hash
+     * for storing results. It has all the arguments applied to it apart from the
+     * callback, and must be synchronous.
+     * @example
+     *
+     * var slow_fn = function(name, callback) {
+     *     // do something
+     *     callback(null, result);
+     * };
+     * var fn = async.memoize(slow_fn);
+     *
+     * // fn can now be used as if it were slow_fn
+     * fn('some name', function() {
+     *     // callback
+     * });
+     */
     function memoize$1(fn, hasher) {
         var memo = Object.create(null);
         var queues = Object.create(null);
@@ -3485,18 +4828,221 @@
         });
     }
 
+    /**
+     * The same as `parallel` but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name parallel
+     * @static
+     * @memberOf async
+     * @see async.parallel
+     * @category Control Flow
+     * @param {Array|Collection} tasks - A collection containing functions to run.
+     * Each function is passed a `callback(err, result)` which it must call on
+     * completion with an error `err` (which can be `null`) and an optional `result`
+     * value.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed successfully. This function gets a results array
+     * (or object) containing all the result arguments passed to the task callbacks.
+     * Invoked with (err, results).
+     */
     function parallelLimit(tasks, limit, cb) {
-        return _parallel(_eachOfLimit(limit), tasks, cb);
+      return _parallel(_eachOfLimit(limit), tasks, cb);
     }
 
+    /**
+     * Run the `tasks` collection of functions in parallel, without waiting until
+     * the previous function has completed. If any of the functions pass an error to
+     * its callback, the main `callback` is immediately called with the value of the
+     * error. Once the `tasks` have completed, the results are passed to the final
+     * `callback` as an array.
+     *
+     * **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about
+     * parallel execution of code.  If your tasks do not use any timers or perform
+     * any I/O, they will actually be executed in series.  Any synchronous setup
+     * sections for each task will happen one after the other.  JavaScript remains
+     * single-threaded.
+     *
+     * It is also possible to use an object instead of an array. Each property will
+     * be run as a function and the results will be passed to the final `callback`
+     * as an object instead of an array. This can be a more readable way of handling
+     * results from {@link async.parallel}.
+     *
+     * @name parallel
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Array|Object} tasks - A collection containing functions to run.
+     * Each function is passed a `callback(err, result)` which it must call on
+     * completion with an error `err` (which can be `null`) and an optional `result`
+     * value.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed successfully. This function gets a results array
+     * (or object) containing all the result arguments passed to the task callbacks.
+     * Invoked with (err, results).
+     * @example
+     * async.parallel([
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'one');
+     *         }, 200);
+     *     },
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'two');
+     *         }, 100);
+     *     }
+     * ],
+     * // optional callback
+     * function(err, results) {
+     *     // the results array will equal ['one','two'] even though
+     *     // the second function had a shorter timeout.
+     * });
+     *
+     * // an example using an object instead of an array
+     * async.parallel({
+     *     one: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 1);
+     *         }, 200);
+     *     },
+     *     two: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 2);
+     *         }, 100);
+     *     }
+     * }, function(err, results) {
+     *     // results is now equals to: {one: 1, two: 2}
+     * });
+     */
     var parallel = doLimit(parallelLimit, Infinity);
 
+    /**
+     * A queue of tasks for the worker function to complete.
+     * @typedef {Object} queue
+     * @property {Function} length - a function returning the number of items
+     * waiting to be processed. Invoke with ().
+     * @property {Function} started - a function returning whether or not any
+     * items have been pushed and processed by the queue. Invoke with ().
+     * @property {Function} running - a function returning the number of items
+     * currently being processed. Invoke with ().
+     * @property {Function} workersList - a function returning the array of items
+     * currently being processed. Invoke with ().
+     * @property {Function} idle - a function returning false if there are items
+     * waiting or being processed, or true if not. Invoke with ().
+     * @property {number} concurrency - an integer for determining how many `worker`
+     * functions should be run in parallel. This property can be changed after a
+     * `queue` is created to alter the concurrency on-the-fly.
+     * @property {Function} push - add a new task to the `queue`. Calls `callback`
+     * once the `worker` has finished processing the task. Instead of a single task,
+     * a `tasks` array can be submitted. The respective callback is used for every
+     * task in the list. Invoke with (task, [callback]),
+     * @property {Function} unshift - add a new task to the front of the `queue`.
+     * Invoke with (task, [callback]).
+     * @property {Function} saturated - a callback that is called when the number of
+     * running workers hits the `concurrency` limit, and further tasks will be
+     * queued.
+     * @property {Function} unsaturated - a callback that is called when the number
+     * of running workers is less than the `concurrency` & `buffer` limits, and
+     * further tasks will not be queued.
+     * @property {number} buffer - A minimum threshold buffer in order to say that
+     * the `queue` is `unsaturated`.
+     * @property {Function} empty - a callback that is called when the last item
+     * from the `queue` is given to a `worker`.
+     * @property {Function} drain - a callback that is called when the last item
+     * from the `queue` has returned from the `worker`.
+     * @property {boolean} paused - a boolean for determining whether the queue is
+     * in a paused state.
+     * @property {Function} pause - a function that pauses the processing of tasks
+     * until `resume()` is called. Invoke with ().
+     * @property {Function} resume - a function that resumes the processing of
+     * queued tasks when the queue is paused. Invoke with ().
+     * @property {Function} kill - a function that removes the `drain` callback and
+     * empties remaining tasks from the queue forcing it to go idle. Invoke with ().
+     */
+
+    /**
+     * Creates a `queue` object with the specified `concurrency`. Tasks added to the
+     * `queue` are processed in parallel (up to the `concurrency` limit). If all
+     * `worker`s are in progress, the task is queued until one becomes available.
+     * Once a `worker` completes a `task`, that `task`'s callback is called.
+     *
+     * @name queue
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Function} worker - An asynchronous function for processing a queued
+     * task, which must call its `callback(err)` argument when finished, with an
+     * optional `error` as an argument.  If you want to handle errors from an
+     * individual task, pass a callback to `q.push()`. Invoked with
+     * (task, callback).
+     * @param {number} [concurrency=1] - An `integer` for determining how many
+     * `worker` functions should be run in parallel.  If omitted, the concurrency
+     * defaults to `1`.  If the concurrency is `0`, an error is thrown.
+     * @returns {queue} A queue object to manage the tasks. Callbacks can
+     * attached as certain properties to listen for specific events during the
+     * lifecycle of the queue.
+     * @example
+     *
+     * // create a queue object with concurrency 2
+     * var q = async.queue(function(task, callback) {
+     *     console.log('hello ' + task.name);
+     *     callback();
+     * }, 2);
+     *
+     * // assign a callback
+     * q.drain = function() {
+     *     console.log('all items have been processed');
+     * };
+     *
+     * // add some items to the queue
+     * q.push({name: 'foo'}, function(err) {
+     *     console.log('finished processing foo');
+     * });
+     * q.push({name: 'bar'}, function (err) {
+     *     console.log('finished processing bar');
+     * });
+     *
+     * // add some items to the queue (batch-wise)
+     * q.push([{name: 'baz'},{name: 'bay'},{name: 'bax'}], function(err) {
+     *     console.log('finished processing item');
+     * });
+     *
+     * // add some items to the front of the queue
+     * q.unshift({name: 'bar'}, function (err) {
+     *     console.log('finished processing bar');
+     * });
+     */
     function queue$1 (worker, concurrency) {
-        return queue(function (items, cb) {
-            worker(items[0], cb);
-        }, concurrency, 1);
+      return queue(function (items, cb) {
+        worker(items[0], cb);
+      }, concurrency, 1);
     }
 
+    /**
+     * The same as {@link async.queue} only tasks are assigned a priority and
+     * completed in ascending priority order.
+     *
+     * @name priorityQueue
+     * @static
+     * @memberOf async
+     * @see async.queue
+     * @category Control Flow
+     * @param {Function} worker - An asynchronous function for processing a queued
+     * task, which must call its `callback(err)` argument when finished, with an
+     * optional `error` as an argument.  If you want to handle errors from an
+     * individual task, pass a callback to `q.push()`. Invoked with
+     * (task, callback).
+     * @param {number} concurrency - An `integer` for determining how many `worker`
+     * functions should be run in parallel.  If omitted, the concurrency defaults to
+     * `1`.  If the concurrency is `0`, an error is thrown.
+     * @returns {queue} A priorityQueue object to manage the tasks. There are two
+     * differences between `queue` and `priorityQueue` objects:
+     * * `push(task, priority, [callback])` - `priority` should be a number. If an
+     *   array of `tasks` is given, all tasks will be assigned the same priority.
+     * * The `unshift` method was removed.
+     */
     function priorityQueue (worker, concurrency) {
         function _compareTasks(a, b) {
             return a.priority - b.priority;
@@ -3539,12 +5085,6 @@
 
                 q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
 
-                if (q.tasks.length === q.concurrency) {
-                    q.saturated();
-                }
-                if (q.tasks.length <= q.concurrency - q.buffer) {
-                    q.unsaturated();
-                }
                 setImmediate$1(q.process);
             });
         }
@@ -3637,6 +5177,41 @@
         : baseEach(collection, baseIteratee(iteratee));
     }
 
+    /**
+     * Runs the `tasks` array of functions in parallel, without waiting until the
+     * previous function has completed. Once any the `tasks` completed or pass an
+     * error to its callback, the main `callback` is immediately called. It's
+     * equivalent to `Promise.race()`.
+     *
+     * @name race
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Array} tasks - An array containing functions to run. Each function
+     * is passed a `callback(err, result)` which it must call on completion with an
+     * error `err` (which can be `null`) and an optional `result` value.
+     * @param {Function} callback - A callback to run once any of the functions have
+     * completed. This function gets an error or result from the first function that
+     * completed. Invoked with (err, result).
+     * @example
+     *
+     * async.race([
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'one');
+     *         }, 200);
+     *     },
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'two');
+     *         }, 100);
+     *     }
+     * ],
+     * // main callback
+     * function(err, result) {
+     *     // the result will be equal to 'two' as it finishes earlier
+     * });
+     */
     function race(tasks, cb) {
         cb = once(cb || noop);
         if (!isArray(tasks)) return cb(new TypeError('First argument to race must be an array of functions'));
@@ -3648,11 +5223,70 @@
 
     var slice = Array.prototype.slice;
 
+    /**
+     * Same as `reduce`, only operates on `coll` in reverse order.
+     *
+     * @name reduceRight
+     * @static
+     * @memberOf async
+     * @see async.reduce
+     * @alias foldr
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {*} memo - The initial state of the reduction.
+     * @param {Function} iteratee - A function applied to each item in the
+     * array to produce the next step in the reduction. The `iteratee` is passed a
+     * `callback(err, reduction)` which accepts an optional error as its first
+     * argument, and the state of the reduction as the second. If an error is
+     * passed to the callback, the reduction is stopped and the main `callback` is
+     * immediately called with the error. Invoked with (memo, item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result is the reduced value. Invoked with
+     * (err, result).
+     */
     function reduceRight(arr, memo, iteratee, cb) {
-        var reversed = slice.call(arr).reverse();
-        reduce(reversed, memo, iteratee, cb);
+      var reversed = slice.call(arr).reverse();
+      reduce(reversed, memo, iteratee, cb);
     }
 
+    /**
+     * Wraps the function in another function that always returns data even when it
+     * errors.
+     *
+     * The object returned has either the property `error` or `value`.
+     *
+     * @name reflect
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {Function} function - The function you want to wrap
+     * @returns {Function} - A function that always passes null to it's callback as
+     * the error. The second argument to the callback will be an `object` with
+     * either an `error` or a `value` property.
+     * @example
+     *
+     * async.parallel([
+     *     async.reflect(function(callback) {
+     *         // do some stuff ...
+     *         callback(null, 'one');
+     *     }),
+     *     async.reflect(function(callback) {
+     *         // do some more stuff but error ...
+     *         callback('bad stuff happened');
+     *     }),
+     *     async.reflect(function(callback) {
+     *         // do some more stuff ...
+     *         callback(null, 'two');
+     *     })
+     * ],
+     * // optional callback
+     * function(err, results) {
+     *     // values
+     *     // results[0].value = 'one'
+     *     // results[1].error = 'bad stuff happened'
+     *     // results[2].value = 'two'
+     * });
+     */
     function reflect(fn) {
         return initialParams(function reflectOn(args, reflectCallback) {
             args.push(rest(function callback(err, cbArgs) {
@@ -3689,20 +5323,236 @@
         }, callback);
     }
 
+    /**
+     * The same as `reject` but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name rejectLimit
+     * @static
+     * @memberOf async
+     * @see async.reject
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     */
     var rejectLimit = doParallelLimit(reject$1);
 
+    /**
+     * The opposite of `filter`. Removes values that pass an `async` truth test.
+     *
+     * @name reject
+     * @static
+     * @memberOf async
+     * @see async.filter
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     * @example
+     *
+     * async.reject(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, results) {
+     *     // results now equals an array of missing files
+     *     createFiles(results);
+     * });
+     */
     var reject = doLimit(rejectLimit, Infinity);
 
+    /**
+     * A helper function that wraps an array of functions with reflect.
+     *
+     * @name reflectAll
+     * @static
+     * @memberOf async
+     * @see async.reflect
+     * @category Util
+     * @param {Array} tasks - The array of functions to wrap in `async.reflect`.
+     * @returns {Array} Returns an array of functions, each function wrapped in
+     * `async.reflect`
+     * @example
+     *
+     * let tasks = [
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'one');
+     *         }, 200);
+     *     },
+     *     function(callback) {
+     *         // do some more stuff but error ...
+     *         callback(new Error('bad stuff happened'));
+     *     },
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'two');
+     *         }, 100);
+     *     }
+     * ];
+     *
+     * async.parallel(async.reflectAll(tasks),
+     * // optional callback
+     * function(err, results) {
+     *     // values
+     *     // results[0].value = 'one'
+     *     // results[1].error = Error('bad stuff happened')
+     *     // results[2].value = 'two'
+     * });
+     */
     function reflectAll(tasks) {
-        return tasks.map(reflect);
+      return tasks.map(reflect);
     }
 
+    /**
+     * The same as `reject` but runs only a single async operation at a time.
+     *
+     * @name rejectSeries
+     * @static
+     * @memberOf async
+     * @see async.reject
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     */
     var rejectSeries = doLimit(rejectLimit, 1);
 
+    /**
+     * Run the functions in the `tasks` collection in series, each one running once
+     * the previous function has completed. If any functions in the series pass an
+     * error to its callback, no more functions are run, and `callback` is
+     * immediately called with the value of the error. Otherwise, `callback`
+     * receives an array of results when `tasks` have completed.
+     *
+     * It is also possible to use an object instead of an array. Each property will
+     * be run as a function, and the results will be passed to the final `callback`
+     * as an object instead of an array. This can be a more readable way of handling
+     *  results from {@link async.series}.
+     *
+     * **Note** that while many implementations preserve the order of object
+     * properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)
+     * explicitly states that
+     *
+     * > The mechanics and order of enumerating the properties is not specified.
+     *
+     * So if you rely on the order in which your series of functions are executed,
+     * and want this to work on all platforms, consider using an array.
+     *
+     * @name series
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Array|Object} tasks - A collection containing functions to run, each
+     * function is passed a `callback(err, result)` it must call on completion with
+     * an error `err` (which can be `null`) and an optional `result` value.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed. This function gets a results array (or object)
+     * containing all the result arguments passed to the `task` callbacks. Invoked
+     * with (err, result).
+     * @example
+     * async.series([
+     *     function(callback) {
+     *         // do some stuff ...
+     *         callback(null, 'one');
+     *     },
+     *     function(callback) {
+     *         // do some more stuff ...
+     *         callback(null, 'two');
+     *     }
+     * ],
+     * // optional callback
+     * function(err, results) {
+     *     // results is now equal to ['one', 'two']
+     * });
+     *
+     * async.series({
+     *     one: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 1);
+     *         }, 200);
+     *     },
+     *     two: function(callback){
+     *         setTimeout(function() {
+     *             callback(null, 2);
+     *         }, 100);
+     *     }
+     * }, function(err, results) {
+     *     // results is now equal to: {one: 1, two: 2}
+     * });
+     */
     function series(tasks, cb) {
-        return _parallel(eachOfSeries, tasks, cb);
+      return _parallel(eachOfSeries, tasks, cb);
     }
 
+    /**
+     * Attempts to get a successful response from `task` no more than `times` times
+     * before returning an error. If the task is successful, the `callback` will be
+     * passed the result of the successful task. If all attempts fail, the callback
+     * will be passed the error and result (if any) of the final attempt.
+     *
+     * @name retry
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - Can be either an
+     * object with `times` and `interval` or a number.
+     * * `times` - The number of attempts to make before giving up.  The default
+     *   is `5`.
+     * * `interval` - The time to wait between retries, in milliseconds.  The
+     *   default is `0`.
+     * * If `opts` is a number, the number specifies the number of times to retry,
+     *   with the default interval of `0`.
+     * @param {Function} task - A function which receives two arguments: (1) a
+     * `callback(err, result)` which must be called when finished, passing `err`
+     * (which can be `null`) and the `result` of the function's execution, and (2)
+     * a `results` object, containing the results of the previously executed
+     * functions (if nested inside another control flow). Invoked with
+     * (callback, results).
+     * @param {Function} [callback] - An optional callback which is called when the
+     * task has succeeded, or after the final failed attempt. It receives the `err`
+     * and `result` arguments of the last attempt at completing the `task`. Invoked
+     * with (err, results).
+     * @example
+     *
+     * // The `retry` function can be used as a stand-alone control flow by passing
+     * // a callback, as shown below:
+     *
+     * // try calling apiMethod 3 times
+     * async.retry(3, apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     * // try calling apiMethod 3 times, waiting 200 ms between each retry
+     * async.retry({times: 3, interval: 200}, apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     *  // try calling apiMethod the default 5 times no delay between each retry
+     * async.retry(apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     * // It can also be embedded within other control flow functions to retry
+     * // individual methods that are not as reliable, like this:
+     * async.auto({
+     *     users: api.getUsers.bind(api),
+     *     payments: async.retry(3, api.getPayments.bind(api))
+     * }, function(err, results) {
+     *     // do something with the results
+     * });
+     */
     function retry(times, task, callback) {
         var DEFAULT_TIMES = 5;
         var DEFAULT_INTERVAL = 0;
@@ -3769,6 +5619,29 @@
         }
     }
 
+    /**
+     * A close relative of `retry`.  This method wraps a task and makes it
+     * retryable, rather than immediately calling it with retries.
+     *
+     * @name retryable
+     * @static
+     * @memberOf async
+     * @see async.retry
+     * @category Control Flow
+     * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - optional
+     * options, exactly the same as from `retry`
+     * @param {Function} task - the asynchronous function to wrap
+     * @returns {Functions} The wrapped function, which when invoked, will retry on
+     * an error, based on the parameters specified in `opts`.
+     * @example
+     *
+     * async.auto({
+     *     dep1: async.retryable(3, getFromFlakyService),
+     *     process: ["dep1", async.retryable(3, function (results, cb) {
+     *         maybeProcessData(results.dep1, cb);
+     *     })]
+     * }, callback);
+     */
     function retryable (opts, task) {
         if (!task) {
             task = opts;
@@ -3783,12 +5656,125 @@
         });
     }
 
+    /**
+     * The same as `some` but runs a maximum of `limit` async operations at a time.
+     *
+     * @name someLimit
+     * @static
+     * @memberOf async
+     * @see async.some
+     * @alias anyLimit
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A truth test to apply to each item in the array
+     * in parallel. The iteratee is passed a `callback(err, truthValue)` which must
+     * be called with a boolean argument once it has completed. Invoked with
+     * (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the iteratee functions have finished.
+     * Result will be either `true` or `false` depending on the values of the async
+     * tests. Invoked with (err, result).
+     */
     var someLimit = _createTester(eachOfLimit, Boolean, identity);
 
+    /**
+     * Returns `true` if at least one element in the `coll` satisfies an async test.
+     * If any iteratee call returns `true`, the main `callback` is immediately
+     * called.
+     *
+     * @name some
+     * @static
+     * @memberOf async
+     * @alias any
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in the array
+     * in parallel. The iteratee is passed a `callback(err, truthValue)` which must
+     * be called with a boolean argument once it has completed. Invoked with
+     * (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the iteratee functions have finished.
+     * Result will be either `true` or `false` depending on the values of the async
+     * tests. Invoked with (err, result).
+     * @example
+     *
+     * async.some(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, result) {
+     *     // if result is true then at least one of the files exists
+     * });
+     */
     var some = doLimit(someLimit, Infinity);
 
+    /**
+     * The same as `some` but runs only a single async operation at a time.
+     *
+     * @name someSeries
+     * @static
+     * @memberOf async
+     * @see async.some
+     * @alias anySeries
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in the array
+     * in parallel. The iteratee is passed a `callback(err, truthValue)` which must
+     * be called with a boolean argument once it has completed. Invoked with
+     * (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the iteratee functions have finished.
+     * Result will be either `true` or `false` depending on the values of the async
+     * tests. Invoked with (err, result).
+     */
     var someSeries = doLimit(someLimit, 1);
 
+    /**
+     * Sorts a list by the results of running each `coll` value through an async
+     * `iteratee`.
+     *
+     * @name sortBy
+     * @static
+     * @memberOf async
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A function to apply to each item in `coll`.
+     * The iteratee is passed a `callback(err, sortValue)` which must be called once
+     * it has completed with an error (which can be `null`) and a value to use as
+     * the sort criteria. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished, or an error occurs. Results is the items
+     * from the original `coll` sorted by the values returned by the `iteratee`
+     * calls. Invoked with (err, results).
+     * @example
+     *
+     * async.sortBy(['file1','file2','file3'], function(file, callback) {
+     *     fs.stat(file, function(err, stats) {
+     *         callback(err, stats.mtime);
+     *     });
+     * }, function(err, results) {
+     *     // results is now the original array of files sorted by
+     *     // modified date
+     * });
+     *
+     * // By modifying the callback parameter the
+     * // sorting order can be influenced:
+     *
+     * // ascending order
+     * async.sortBy([1,9,3,5], function(x, callback) {
+     *     callback(null, x);
+     * }, function(err,result) {
+     *     // result callback
+     * });
+     *
+     * // descending order
+     * async.sortBy([1,9,3,5], function(x, callback) {
+     *     callback(null, x*-1);    //<- x*-1 instead of x, turns the order around
+     * }, function(err,result) {
+     *     // result callback
+     * });
+     */
     function sortBy(arr, iteratee, cb) {
         map(arr, function (x, cb) {
             iteratee(x, function (err, criteria) {
@@ -3807,6 +5793,28 @@
         }
     }
 
+    /**
+     * Sets a time limit on an asynchronous function. If the function does not call
+     * its callback within the specified miliseconds, it will be called with a
+     * timeout error. The code property for the error object will be `'ETIMEDOUT'`.
+     *
+     * @name timeout
+     * @static
+     * @memberOf async
+     * @category Util
+     * @param {Function} function - The asynchronous function you want to set the
+     * time limit.
+     * @param {number} miliseconds - The specified time limit.
+     * @param {*} [info] - Any variable you want attached (`string`, `object`, etc)
+     * to timeout Error for more information..
+     * @returns {Function} Returns a wrapped function that can be used with any of
+     * the control flow functions.
+     * @example
+     *
+     * async.timeout(function(callback) {
+     *     doAsyncTask(callback);
+     * }, 1000);
+     */
     function timeout(asyncFn, miliseconds, info) {
         var originalCallback, timer;
         var timedOut = false;
@@ -3863,40 +5871,232 @@
       return result;
     }
 
+    /**
+    * The same as {@link times} but runs a maximum of `limit` async operations at a
+    * time.
+     *
+     * @name timesLimit
+     * @static
+     * @memberOf async
+     * @see async.times
+     * @category Control Flow
+     * @param {number} n - The number of times to run the function.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - The function to call `n` times. Invoked with the
+     * iteration index and a callback (n, next).
+     * @param {Function} callback - see {@link async.map}.
+     */
     function timeLimit(count, limit, iteratee, cb) {
-        return mapLimit(baseRange(0, count, 1), limit, iteratee, cb);
+      return mapLimit(baseRange(0, count, 1), limit, iteratee, cb);
     }
 
+    /**
+     * Calls the `iteratee` function `n` times, and accumulates results in the same
+     * manner you would use with {@link async.map}.
+     *
+     * @name times
+     * @static
+     * @memberOf async
+     * @see async.map
+     * @category Control Flow
+     * @param {number} n - The number of times to run the function.
+     * @param {Function} iteratee - The function to call `n` times. Invoked with the
+     * iteration index and a callback (n, next).
+     * @param {Function} callback - see {@link async.map}.
+     * @example
+     *
+     * // Pretend this is some complicated async factory
+     * var createUser = function(id, callback) {
+     *     callback(null, {
+     *         id: 'user' + id
+     *     });
+     * };
+     *
+     * // generate 5 users
+     * async.times(5, function(n, next) {
+     *     createUser(n, function(err, user) {
+     *         next(err, user);
+     *     });
+     * }, function(err, users) {
+     *     // we should now have 5 users
+     * });
+     */
     var times = doLimit(timeLimit, Infinity);
 
+    /**
+     * The same as {@link async.times} but runs only a single async operation at a time.
+     *
+     * @name timesSeries
+     * @static
+     * @memberOf async
+     * @see async.times
+     * @category Control Flow
+     * @param {number} n - The number of times to run the function.
+     * @param {Function} iteratee - The function to call `n` times. Invoked with the
+     * iteration index and a callback (n, next).
+     * @param {Function} callback - see {@link async.map}.
+     */
     var timesSeries = doLimit(timeLimit, 1);
 
-    function transform(arr, memo, iteratee, callback) {
+    /**
+     * A relative of `reduce`.  Takes an Object or Array, and iterates over each
+     * element in series, each step potentially mutating an `accumulator` value.
+     * The type of the accumulator defaults to the type of collection passed in.
+     *
+     * @name transform
+     * @static
+     * @memberOf async
+     * @category Collection
+     * @param {Array|Object} coll - A collection to iterate over.
+     * @param {*} [accumulator] - The initial state of the transform.  If omitted,
+     * it will default to an empty Object or Array, depending on the type of `coll`
+     * @param {Function} iteratee - A function applied to each item in the
+     * collection that potentially modifies the accumulator. The `iteratee` is
+     * passed a `callback(err)` which accepts an optional error as its first
+     * argument. If an error is passed to the callback, the transform is stopped
+     * and the main `callback` is immediately called with the error.
+     * Invoked with (accumulator, item, key, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result is the transformed accumulator.
+     * Invoked with (err, result).
+     * @example
+     *
+     * async.transform([1,2,3], function(acc, item, index, callback) {
+     *     // pointless async:
+     *     process.nextTick(function() {
+     *         acc.push(item * 2)
+     *         callback(null)
+     *     });
+     * }, function(err, result) {
+     *     // result is now equal to [2, 4, 6]
+     * });
+     *
+     * @example
+     *
+     * async.transform({a: 1, b: 2, c: 3}, function (obj, val, key, callback) {
+     *     setImmediate(function () {
+     *         obj[key] = val * 2;
+     *         callback();
+     *     })
+     * }, function (err, result) {
+     *     // result is equal to {a: 2, b: 4, c: 6}
+     * })
+     */
+    function transform(arr, acc, iteratee, callback) {
         if (arguments.length === 3) {
             callback = iteratee;
-            iteratee = memo;
-            memo = isArray(arr) ? [] : {};
+            iteratee = acc;
+            acc = isArray(arr) ? [] : {};
         }
 
         eachOf(arr, function (v, k, cb) {
-            iteratee(memo, v, k, cb);
+            iteratee(acc, v, k, cb);
         }, function (err) {
-            callback(err, memo);
+            callback(err, acc);
         });
     }
 
+    /**
+     * Undoes a {@link async.memoize}d function, reverting it to the original,
+     * unmemoized form. Handy for testing.
+     *
+     * @name unmemoize
+     * @static
+     * @memberOf async
+     * @see async.memoize
+     * @category Util
+     * @param {Function} fn - the memoized function
+     */
+
     function unmemoize(fn) {
         return function () {
             return (fn.unmemoized || fn).apply(null, arguments);
         };
     }
 
+    /**
+     * Repeatedly call `fn` until `test` returns `true`. Calls `callback` when
+     * stopped, or an error occurs. `callback` will be passed an error and any
+     * arguments passed to the final `fn`'s callback.
+     *
+     * The inverse of {@link async.whilst}.
+     *
+     * @name until
+     * @static
+     * @memberOf async
+     * @see async.whilst
+     * @category Control Flow
+     * @param {Function} test - synchronous truth test to perform before each
+     * execution of `fn`. Invoked with ().
+     * @param {Function} fn - A function which is called each time `test` fails.
+     * The function is passed a `callback(err)`, which must be called once it has
+     * completed with an optional `err` argument. Invoked with (callback).
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has passed and repeated execution of `fn` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `fn`'s
+     * callback. Invoked with (err, [results]);
+     */
     function until(test, iteratee, cb) {
         return whilst(function () {
             return !test.apply(this, arguments);
         }, iteratee, cb);
     }
 
+    /**
+     * Runs the `tasks` array of functions in series, each passing their results to
+     * the next in the array. However, if any of the `tasks` pass an error to their
+     * own callback, the next function is not executed, and the main `callback` is
+     * immediately called with the error.
+     *
+     * @name waterfall
+     * @static
+     * @memberOf async
+     * @category Control Flow
+     * @param {Array} tasks - An array of functions to run, each function is passed
+     * a `callback(err, result1, result2, ...)` it must call on completion. The
+     * first argument is an error (which can be `null`) and any further arguments
+     * will be passed as arguments in order to the next task.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed. This will be passed the results of the last task's
+     * callback. Invoked with (err, [results]).
+     * @example
+     *
+     * async.waterfall([
+     *     function(callback) {
+     *         callback(null, 'one', 'two');
+     *     },
+     *     function(arg1, arg2, callback) {
+     *         // arg1 now equals 'one' and arg2 now equals 'two'
+     *         callback(null, 'three');
+     *     },
+     *     function(arg1, callback) {
+     *         // arg1 now equals 'three'
+     *         callback(null, 'done');
+     *     }
+     * ], function (err, result) {
+     *     // result now equals 'done'
+     * });
+     *
+     * // Or, with named functions:
+     * async.waterfall([
+     *     myFirstFunction,
+     *     mySecondFunction,
+     *     myLastFunction,
+     * ], function (err, result) {
+     *     // result now equals 'done'
+     * });
+     * function myFirstFunction(callback) {
+     *     callback(null, 'one', 'two');
+     * }
+     * function mySecondFunction(arg1, arg2, callback) {
+     *     // arg1 now equals 'one' and arg2 now equals 'two'
+     *     callback(null, 'three');
+     * }
+     * function myLastFunction(arg1, callback) {
+     *     // arg1 now equals 'three'
+     *     callback(null, 'done');
+     * }
+     */
     function waterfall (tasks, cb) {
         cb = once(cb || noop);
         if (!isArray(tasks)) return cb(new Error('First argument to waterfall must be an array of functions'));
diff --git a/dist/async.min.js b/dist/async.min.js
index 4798cc7..6274bc3 100644
--- a/dist/async.min.js
+++ b/dist/async.min.js
@@ -1,2 +1,2 @@
-!function(n,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(n.async=n.async||{})}(this,function(n){"use strict";function t(n,t,r){var e=r.length;switch(e){case 0:return n.call(t);case 1:return n.call(t,r[0]);case 2:return n.call(t,r[0],r[1]);case 3:return n.call(t,r[0],r[1],r[2])}return n.apply(t,r)}function r(n){var t=typeof n;return!!n&&("object"==t||"function"==t)}function e(n){var t=r(n)?Ht.call(n):"";return t==Vt||t==Qt}function o(n){return!!n&&"object"==typeof n}function u(n){return"symbol"==typeof n||o(n)&&Xt.call(n)==Jt}function i(n){if("number"==typeof n)return n;if(u(n))return Yt;if(r(n)){var t=e(n.valueOf)?n.valueOf():n;n=r(t)?t+"":t}if("string"!=typeof n)return 0===n?n:+n;n=n.replace(Zt,"");var o=tr.test(n);return o||rr.test(n)?er(n.slice(2),o?2:8):nr.test(n)?Yt:+n}function c(n){if(!n)return 0===n?n:0;if(n=i(n),n===or||n===-or){var t=0>n?-1:1;return t*ur}var r=n%1;return 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\ No newline at end of file
diff --git a/lib/applyEachSeries.js b/lib/applyEachSeries.js
index c56989b..675a029 100644
--- a/lib/applyEachSeries.js
+++ b/lib/applyEachSeries.js
@@ -9,7 +9,7 @@ import mapSeries from './mapSeries';
  * @name applyEachSeries
  * @static
  * @memberOf async
- * @see `async.applyEach`
+ * @see async.applyEach
  * @category Control Flow
  * @param {Array|Object} fns - A collection of asynchronous functions to all
  * call with the same arguments
diff --git a/lib/auto.js b/lib/auto.js
index 148cd5f..750a564 100644
--- a/lib/auto.js
+++ b/lib/auto.js
@@ -112,36 +112,34 @@ export default function (tasks, concurrency, callback) {
 
     var readyTasks = [];
 
+    // for cycle detection:
+    var readyToCheck = []; // tasks that have been identified as reachable
+    // without the possibility of returning to an ancestor task
+    var uncheckedDependencies = {};
 
     forOwn(tasks, function (task, key) {
         if (!isArray(task)) {
             // no dependencies
             enqueueTask(key, [task]);
+            readyToCheck.push(key);
             return;
         }
 
         var dependencies = task.slice(0, task.length - 1);
         var remainingDependencies = dependencies.length;
-
-        checkForDeadlocks();
-
-        function checkForDeadlocks() {
-            var len = dependencies.length;
-            var dep;
-            while (len--) {
-                if (!(dep = tasks[dependencies[len]])) {
-                    throw new Error('async.auto task `' + key +
-                        '` has non-existent dependency in ' +
-                        dependencies.join(', '));
-                }
-                if (isArray(dep) && indexOf(dep, key, 0) >= 0) {
-                    throw new Error('async.auto task `' + key +
-                        '`Has cyclic dependencies');
-                }
-            }
+        if (remainingDependencies === 0) {
+            enqueueTask(key, task);
+            readyToCheck.push(key);
+            return;
         }
+        uncheckedDependencies[key] = remainingDependencies;
 
         arrayEach(dependencies, function (dependencyName) {
+            if (!tasks[dependencyName]) {
+                throw new Error('async.auto task `' + key +
+                    '` has a non-existent dependency in ' +
+                    dependencies.join(', '));
+            }
             addListener(dependencyName, function () {
                 remainingDependencies--;
                 if (remainingDependencies === 0) {
@@ -151,9 +149,9 @@ export default function (tasks, concurrency, callback) {
         });
     });
 
+    checkForDeadlocks();
     processQueue();
 
-
     function enqueueTask(key, task) {
         readyTasks.push(function () {
             runTask(key, task);
@@ -222,5 +220,36 @@ export default function (tasks, concurrency, callback) {
         }
     }
 
+    function checkForDeadlocks() {
+        // Kahn's algorithm
+        // https://en.wikipedia.org/wiki/Topological_sorting#Kahn.27s_algorithm
+        // http://connalle.blogspot.com/2013/10/topological-sortingkahn-algorithm.html
+        var currentTask;
+        var counter = 0;
+        while (readyToCheck.length) {
+            currentTask = readyToCheck.pop();
+            counter++;
+            arrayEach(getDependents(currentTask), function (dependent) {
+                if (!(--uncheckedDependencies[dependent])) {
+                    readyToCheck.push(dependent);
+                }
+            });
+        }
+
+        if (counter !== numTasks) {
+            throw new Error(
+                'async.auto cannot execute tasks due to a recursive dependency'
+            );
+        }
+    }
 
+    function getDependents(taskName) {
+        var result = [];
+        forOwn(tasks, function (task, key) {
+            if (isArray(task) && indexOf(task, taskName, 0) >= 0) {
+                result.push(key);
+            }
+        });
+        return result;
+    }
 }
diff --git a/lib/autoInject.js b/lib/autoInject.js
index 5cd83a2..40a250d 100644
--- a/lib/autoInject.js
+++ b/lib/autoInject.js
@@ -12,7 +12,7 @@ function parseParams(func) {
 }
 
 /**
- * A dependency-injected version of the [`auto`](#auto) function. Dependent
+ * A dependency-injected version of the {@link async.auto} function. Dependent
  * tasks are specified as parameters to the function, after the usual callback
  * parameter, with the parameter names matching the names of the tasks it
  * depends on. This can provide even more readable task graphs which can be
@@ -22,12 +22,12 @@ function parseParams(func) {
  * specified as named parameters after the initial error parameter.
  *
  * The autoInject function is purely syntactic sugar and its semantics are
- * otherwise equivalent to [`auto`](#auto).
+ * otherwise equivalent to {@link async.auto}.
  *
  * @name autoInject
  * @static
  * @memberOf async
- * @see `async.auto`
+ * @see async.auto
  * @category Control Flow
  * @param {Object} tasks - An object, each of whose properties is a function of
  * the form 'func([dependencies...], callback). The object's key of a property
@@ -107,7 +107,7 @@ export default function autoInject(tasks, callback) {
             params = clone(taskFn);
             taskFn = params.pop();
 
-            newTasks[key] = params.concat(newTask);
+            newTasks[key] = params.concat(params.length > 0 ? newTask : taskFn);
         } else if (taskFn.length === 0) {
             throw new Error("autoInject task functions require explicit parameters.");
         } else if (taskFn.length === 1) {
diff --git a/lib/cargo.js b/lib/cargo.js
index faa4ab4..a2fe98e 100644
--- a/lib/cargo.js
+++ b/lib/cargo.js
@@ -4,7 +4,7 @@ import queue from './internal/queue';
 
 /**
  * A cargo of tasks for the worker function to complete. Cargo inherits all of
- * the same methods and event callbacks as [`queue`](#queue).
+ * the same methods and event callbacks as {@link async.queue}.
  * @typedef {Object} cargo
  * @property {Function} length - A function returning the number of items
  * waiting to be processed. Invoke with ().
@@ -46,7 +46,7 @@ import queue from './internal/queue';
  * @name cargo
  * @static
  * @memberOf async
- * @see `async.queue`
+ * @see async.queue
  * @category Control Flow
  * @param {Function} worker - An asynchronous function for processing an array
  * of queued tasks, which must call its `callback(err)` argument when finished,
diff --git a/lib/concatSeries.js b/lib/concatSeries.js
index 3fb89d2..73312dc 100644
--- a/lib/concatSeries.js
+++ b/lib/concatSeries.js
@@ -9,7 +9,7 @@ import doSeries from './internal/doSeries';
  * @name concatSeries
  * @static
  * @memberOf async
- * @see `async.concat`
+ * @see async.concat
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
  * @param {Function} iteratee - A function to apply to each item in `coll`.
diff --git a/lib/detectLimit.js b/lib/detectLimit.js
index ee9080b..20c8040 100644
--- a/lib/detectLimit.js
+++ b/lib/detectLimit.js
@@ -13,7 +13,7 @@ import findGetResult from './internal/findGetResult';
  * @name detectLimit
  * @static
  * @memberOf async
- * @see `async.detect`
+ * @see async.detect
  * @alias findLimit
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/detectSeries.js b/lib/detectSeries.js
index 9c88bda..659d820 100644
--- a/lib/detectSeries.js
+++ b/lib/detectSeries.js
@@ -12,7 +12,7 @@ import findGetResult from './internal/findGetResult';
  * @name detectSeries
  * @static
  * @memberOf async
- * @see `async.detect`
+ * @see async.detect
  * @alias findSeries
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/doDuring.js b/lib/doDuring.js
index 6833a78..76050ab 100644
--- a/lib/doDuring.js
+++ b/lib/doDuring.js
@@ -3,14 +3,14 @@
 import during from './during';
 
 /**
- * The post-check version of [`during`](#during). To reflect the difference in
+ * The post-check version of {@link async.during}. To reflect the difference in
  * the order of operations, the arguments `test` and `fn` are switched.
  *
- * Also a version of [`doWhilst`](#doWhilst) with asynchronous `test` function.
+ * Also a version of {@link async.doWhilst} with asynchronous `test` function.
  * @name doDuring
  * @static
  * @memberOf async
- * @see `async.during`
+ * @see async.during
  * @category Control Flow
  * @param {Function} fn - A function which is called each time `test` passes.
  * The function is passed a `callback(err)`, which must be called once it has
diff --git a/lib/doUntil.js b/lib/doUntil.js
index e5c48c9..4e6bbc3 100644
--- a/lib/doUntil.js
+++ b/lib/doUntil.js
@@ -3,19 +3,19 @@
 import doWhilst from './doWhilst';
 
 /**
- * Like [`doWhilst`](#doWhilst), except the `test` is inverted. Note the
+ * Like {@link async.doWhilst}, except the `test` is inverted. Note the
  * argument ordering differs from `until`.
  *
  * @name doUntil
  * @static
  * @memberOf async
- * @see `async.doWhilst`
+ * @see async.doWhilst
  * @category Control Flow
  * @param {Function} fn - A function which is called each time `test` fails.
  * The function is passed a `callback(err)`, which must be called once it has
  * completed with an optional `err` argument. Invoked with (callback).
- * @param {Function} test - synchronous truth test to perform before each
- * execution of `fn`. Invoked with ().
+ * @param {Function} test - synchronous truth test to perform after each
+ * execution of `fn`. Invoked with the non-error callback results of `fn`.
  * @param {Function} [callback] - A callback which is called after the test
  * function has passed and repeated execution of `fn` has stopped. `callback`
  * will be passed an error and any arguments passed to the final `fn`'s
diff --git a/lib/doWhilst.js b/lib/doWhilst.js
index 54c8303..b38036b 100644
--- a/lib/doWhilst.js
+++ b/lib/doWhilst.js
@@ -3,7 +3,7 @@
 import whilst from './whilst';
 
 /**
- * The post-check version of [`whilst`](#whilst). To reflect the difference in
+ * The post-check version of {@link async.whilst}. To reflect the difference in
  * the order of operations, the arguments `test` and `fn` are switched.
  *
  * `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
@@ -11,13 +11,14 @@ import whilst from './whilst';
  * @name doWhilst
  * @static
  * @memberOf async
- * @see `async.whilst`
+ * @see async.whilst
  * @category Control Flow
  * @param {Function} fn - A function which is called each time `test` passes.
  * The function is passed a `callback(err)`, which must be called once it has
  * completed with an optional `err` argument. Invoked with (callback).
- * @param {Function} test - synchronous truth test to perform before each
- * execution of `fn`. Invoked with ().
+ * @param {Function} test - synchronous truth test to perform after each
+ * execution of `fn`. Invoked with Invoked with the non-error callback results
+ * of `fn`.
  * @param {Function} [callback] - A callback which is called after the test
  * function has failed and repeated execution of `fn` has stopped. `callback`
  * will be passed an error and any arguments passed to the final `fn`'s
diff --git a/lib/during.js b/lib/during.js
index 7c3d10c..de3b1a1 100644
--- a/lib/during.js
+++ b/lib/during.js
@@ -4,7 +4,7 @@ import noop from 'lodash/noop';
 import rest from 'lodash/rest';
 
 /**
- * Like [`whilst`](#whilst), except the `test` is an asynchronous function that
+ * Like {@link async.whilst}, except the `test` is an asynchronous function that
  * is passed a callback in the form of `function (err, truth)`. If error is
  * passed to `test` or `fn`, the main callback is immediately called with the
  * value of the error.
@@ -12,7 +12,7 @@ import rest from 'lodash/rest';
  * @name during
  * @static
  * @memberOf async
- * @see `async.whilst`
+ * @see async.whilst
  * @category Control Flow
  * @param {Function} test - asynchronous truth test to perform before each
  * execution of `fn`. Invoked with (callback).
diff --git a/lib/eachLimit.js b/lib/eachLimit.js
index 825c47e..415e6e8 100644
--- a/lib/eachLimit.js
+++ b/lib/eachLimit.js
@@ -9,7 +9,7 @@ import withoutIndex from './internal/withoutIndex';
  * @name eachLimit
  * @static
  * @memberOf async
- * @see `async.each`
+ * @see async.each
  * @alias forEachLimit
  * @category Collection
  * @param {Array|Object} coll - A colleciton to iterate over.
diff --git a/lib/eachOfLimit.js b/lib/eachOfLimit.js
index fe0f088..753dbc0 100644
--- a/lib/eachOfLimit.js
+++ b/lib/eachOfLimit.js
@@ -9,7 +9,7 @@ import _eachOfLimit from './internal/eachOfLimit';
  * @name eachOfLimit
  * @static
  * @memberOf async
- * @see `async.eachOf`
+ * @see async.eachOf
  * @alias forEachOfLimit
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/eachOfSeries.js b/lib/eachOfSeries.js
index f4cd1a3..0718805 100644
--- a/lib/eachOfSeries.js
+++ b/lib/eachOfSeries.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name eachOfSeries
  * @static
  * @memberOf async
- * @see `async.eachOf`
+ * @see async.eachOf
  * @alias forEachOfSeries
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/eachSeries.js b/lib/eachSeries.js
index 7488955..470c34c 100644
--- a/lib/eachSeries.js
+++ b/lib/eachSeries.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name eachSeries
  * @static
  * @memberOf async
- * @see `async.each`
+ * @see async.each
  * @alias forEachSeries
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/everyLimit.js b/lib/everyLimit.js
index e9a690d..6470261 100644
--- a/lib/everyLimit.js
+++ b/lib/everyLimit.js
@@ -10,7 +10,7 @@ import notId from './internal/notId';
  * @name everyLimit
  * @static
  * @memberOf async
- * @see `async.every`
+ * @see async.every
  * @alias allLimit
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/everySeries.js b/lib/everySeries.js
index 636a088..aca6cec 100644
--- a/lib/everySeries.js
+++ b/lib/everySeries.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name everySeries
  * @static
  * @memberOf async
- * @see `async.every`
+ * @see async.every
  * @alias allSeries
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/filterLimit.js b/lib/filterLimit.js
index 34be228..414ea4d 100644
--- a/lib/filterLimit.js
+++ b/lib/filterLimit.js
@@ -10,7 +10,7 @@ import doParallelLimit from './internal/doParallelLimit';
  * @name filterLimit
  * @static
  * @memberOf async
- * @see `async.filter`
+ * @see async.filter
  * @alias selectLimit
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/filterSeries.js b/lib/filterSeries.js
index 44c7542..97c3907 100644
--- a/lib/filterSeries.js
+++ b/lib/filterSeries.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name filterSeries
  * @static
  * @memberOf async
- * @see `async.filter`
+ * @see async.filter
  * @alias selectSeries
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/internal/once.js b/lib/internal/once.js
index 11678dc..f601185 100644
--- a/lib/internal/once.js
+++ b/lib/internal/once.js
@@ -1,7 +1,8 @@
 export default function once(fn) {
     return function () {
         if (fn === null) return;
-        fn.apply(this, arguments);
+        var callFn = fn;
         fn = null;
+        callFn.apply(this, arguments);
     };
 }
diff --git a/lib/internal/onlyOnce.js b/lib/internal/onlyOnce.js
index f4241c8..355ff41 100644
--- a/lib/internal/onlyOnce.js
+++ b/lib/internal/onlyOnce.js
@@ -3,7 +3,8 @@
 export default function onlyOnce(fn) {
     return function() {
         if (fn === null) throw new Error("Callback was already called.");
-        fn.apply(this, arguments);
+        var callFn = fn;
         fn = null;
+        callFn.apply(this, arguments);
     };
 }
diff --git a/lib/mapLimit.js b/lib/mapLimit.js
index 8512885..916b206 100644
--- a/lib/mapLimit.js
+++ b/lib/mapLimit.js
@@ -9,7 +9,7 @@ import map from './internal/map';
  * @name mapLimit
  * @static
  * @memberOf async
- * @see `async.map`
+ * @see async.map
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
  * @param {number} limit - The maximum number of async operations at a time.
diff --git a/lib/mapSeries.js b/lib/mapSeries.js
index d5a9af2..efa2818 100644
--- a/lib/mapSeries.js
+++ b/lib/mapSeries.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name mapSeries
  * @static
  * @memberOf async
- * @see `async.map`
+ * @see async.map
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
  * @param {Function} iteratee - A function to apply to each item in `coll`.
diff --git a/lib/parallel.js b/lib/parallel.js
index 8856fb1..eb910ce 100644
--- a/lib/parallel.js
+++ b/lib/parallel.js
@@ -19,7 +19,7 @@ import doLimit from './internal/doLimit';
  * It is also possible to use an object instead of an array. Each property will
  * be run as a function and the results will be passed to the final `callback`
  * as an object instead of an array. This can be a more readable way of handling
- * results from [`parallel`](#parallel).
+ * results from {@link async.parallel}.
  *
  * @name parallel
  * @static
diff --git a/lib/parallelLimit.js b/lib/parallelLimit.js
index 188624c..5b62150 100644
--- a/lib/parallelLimit.js
+++ b/lib/parallelLimit.js
@@ -10,7 +10,7 @@ import parallel from './internal/parallel';
  * @name parallel
  * @static
  * @memberOf async
- * @see `async.parallel`
+ * @see async.parallel
  * @category Control Flow
  * @param {Array|Collection} tasks - A collection containing functions to run.
  * Each function is passed a `callback(err, result)` which it must call on
diff --git a/lib/priorityQueue.js b/lib/priorityQueue.js
index a33f2f5..0d8fd93 100644
--- a/lib/priorityQueue.js
+++ b/lib/priorityQueue.js
@@ -9,13 +9,13 @@ import setImmediate from './setImmediate';
 import queue from './queue';
 
 /**
- * The same as [`queue`](#queue) only tasks are assigned a priority and
+ * The same as {@link async.queue} only tasks are assigned a priority and
  * completed in ascending priority order.
  *
  * @name priorityQueue
  * @static
  * @memberOf async
- * @see `async.queue`
+ * @see async.queue
  * @category Control Flow
  * @param {Function} worker - An asynchronous function for processing a queued
  * task, which must call its `callback(err)` argument when finished, with an
@@ -73,12 +73,6 @@ export default function(worker, concurrency) {
 
             q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
 
-            if (q.tasks.length === q.concurrency) {
-                q.saturated();
-            }
-            if (q.tasks.length <= (q.concurrency - q.buffer) ) {
-                q.unsaturated();
-            }
             setImmediate(q.process);
         });
     }
diff --git a/lib/reduceRight.js b/lib/reduceRight.js
index c0135a8..033b9da 100644
--- a/lib/reduceRight.js
+++ b/lib/reduceRight.js
@@ -10,7 +10,7 @@ var slice = Array.prototype.slice;
  * @name reduceRight
  * @static
  * @memberOf async
- * @see `async.reduce`
+ * @see async.reduce
  * @alias foldr
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/reflectAll.js b/lib/reflectAll.js
index 2a0f197..b6884cc 100644
--- a/lib/reflectAll.js
+++ b/lib/reflectAll.js
@@ -8,7 +8,7 @@ import reflect from './reflect';
  * @name reflectAll
  * @static
  * @memberOf async
- * @see `async.reflect`
+ * @see async.reflect
  * @category Util
  * @param {Array} tasks - The array of functions to wrap in `async.reflect`.
  * @returns {Array} Returns an array of functions, each function wrapped in
diff --git a/lib/reject.js b/lib/reject.js
index b96321a..f7f6f10 100644
--- a/lib/reject.js
+++ b/lib/reject.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name reject
  * @static
  * @memberOf async
- * @see `async.filter`
+ * @see async.filter
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
  * @param {Function} iteratee - A truth test to apply to each item in `coll`.
diff --git a/lib/rejectLimit.js b/lib/rejectLimit.js
index 67f34cb..9b3fbd3 100644
--- a/lib/rejectLimit.js
+++ b/lib/rejectLimit.js
@@ -10,7 +10,7 @@ import doParallelLimit from './internal/doParallelLimit';
  * @name rejectLimit
  * @static
  * @memberOf async
- * @see `async.reject`
+ * @see async.reject
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
  * @param {number} limit - The maximum number of async operations at a time.
diff --git a/lib/rejectSeries.js b/lib/rejectSeries.js
index 858f39a..1732eca 100644
--- a/lib/rejectSeries.js
+++ b/lib/rejectSeries.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name rejectSeries
  * @static
  * @memberOf async
- * @see `async.reject`
+ * @see async.reject
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
  * @param {Function} iteratee - A truth test to apply to each item in `coll`.
diff --git a/lib/retryable.js b/lib/retryable.js
index 58f56f4..b9c0fbb 100644
--- a/lib/retryable.js
+++ b/lib/retryable.js
@@ -8,7 +8,7 @@ import initialParams from './internal/initialParams';
  * @name retryable
  * @static
  * @memberOf async
- * @see `async.retry`
+ * @see async.retry
  * @category Control Flow
  * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - optional
  * options, exactly the same as from `retry`
diff --git a/lib/seq.js b/lib/seq.js
index 35cde9f..ec1f10c 100644
--- a/lib/seq.js
+++ b/lib/seq.js
@@ -7,14 +7,14 @@ import reduce from './reduce';
 /**
  * Version of the compose function that is more natural to read. Each function
  * consumes the return value of the previous function. It is the equivalent of
- * [`compose`](#compose) with the arguments reversed.
+ * {@link async.compose} with the arguments reversed.
  *
  * Each function is executed with the `this` binding of the composed function.
  *
  * @name seq
  * @static
  * @memberOf async
- * @see `async.compose`
+ * @see async.compose
  * @category Control Flow
  * @param {...Function} functions - the asynchronous functions to compose
  * @example
diff --git a/lib/series.js b/lib/series.js
index b0cc6bf..17392cd 100644
--- a/lib/series.js
+++ b/lib/series.js
@@ -13,7 +13,7 @@ import eachOfSeries from './eachOfSeries';
  * It is also possible to use an object instead of an array. Each property will
  * be run as a function, and the results will be passed to the final `callback`
  * as an object instead of an array. This can be a more readable way of handling
- *  results from [`series`](#series).
+ *  results from {@link async.series}.
  *
  * **Note** that while many implementations preserve the order of object
  * properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)
diff --git a/lib/someLimit.js b/lib/someLimit.js
index a70e194..521c116 100644
--- a/lib/someLimit.js
+++ b/lib/someLimit.js
@@ -10,7 +10,7 @@ import identity from 'lodash/identity';
  * @name someLimit
  * @static
  * @memberOf async
- * @see `async.some`
+ * @see async.some
  * @alias anyLimit
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/someSeries.js b/lib/someSeries.js
index 5637556..41ca733 100644
--- a/lib/someSeries.js
+++ b/lib/someSeries.js
@@ -9,7 +9,7 @@ import doLimit from './internal/doLimit';
  * @name someSeries
  * @static
  * @memberOf async
- * @see `async.some`
+ * @see async.some
  * @alias anySeries
  * @category Collection
  * @param {Array|Object} coll - A collection to iterate over.
diff --git a/lib/times.js b/lib/times.js
index ef92779..8b4bb2b 100644
--- a/lib/times.js
+++ b/lib/times.js
@@ -5,17 +5,17 @@ import doLimit from './internal/doLimit';
 
 /**
  * Calls the `iteratee` function `n` times, and accumulates results in the same
- * manner you would use with [`map`](#map).
+ * manner you would use with {@link async.map}.
  *
  * @name times
  * @static
  * @memberOf async
- * @see `async.map`
+ * @see async.map
  * @category Control Flow
  * @param {number} n - The number of times to run the function.
  * @param {Function} iteratee - The function to call `n` times. Invoked with the
  * iteration index and a callback (n, next).
- * @param {Function} callback - see [`map`](#map).
+ * @param {Function} callback - see {@link async.map}.
  * @example
  *
  * // Pretend this is some complicated async factory
diff --git a/lib/timesLimit.js b/lib/timesLimit.js
index abec4f8..a6ac311 100644
--- a/lib/timesLimit.js
+++ b/lib/timesLimit.js
@@ -4,19 +4,19 @@ import mapLimit from './mapLimit';
 import range from 'lodash/_baseRange';
 
 /**
-* The same as `times` but runs a maximum of `limit` async operations at a
+* The same as {@link times} but runs a maximum of `limit` async operations at a
 * time.
  *
  * @name timesLimit
  * @static
  * @memberOf async
- * @see `async.times`
+ * @see async.times
  * @category Control Flow
  * @param {number} n - The number of times to run the function.
  * @param {number} limit - The maximum number of async operations at a time.
  * @param {Function} iteratee - The function to call `n` times. Invoked with the
  * iteration index and a callback (n, next).
- * @param {Function} callback - see [`map`](#map).
+ * @param {Function} callback - see {@link async.map}.
  */
 export default function timeLimit(count, limit, iteratee, cb) {
     return mapLimit(range(0, count, 1), limit, iteratee, cb);
diff --git a/lib/timesSeries.js b/lib/timesSeries.js
index e68d1ed..a610b11 100644
--- a/lib/timesSeries.js
+++ b/lib/timesSeries.js
@@ -4,16 +4,16 @@ import timesLimit from './timesLimit';
 import doLimit from './internal/doLimit';
 
 /**
- * The same as `times` but runs only a single async operation at a time.
+ * The same as {@link async.times} but runs only a single async operation at a time.
  *
  * @name timesSeries
  * @static
  * @memberOf async
- * @see `async.times`
+ * @see async.times
  * @category Control Flow
  * @param {number} n - The number of times to run the function.
  * @param {Function} iteratee - The function to call `n` times. Invoked with the
  * iteration index and a callback (n, next).
- * @param {Function} callback - see [`map`](#map).
+ * @param {Function} callback - see {@link async.map}.
  */
 export default doLimit(timesLimit, 1);
diff --git a/lib/transform.js b/lib/transform.js
index 819cd5d..cdad526 100644
--- a/lib/transform.js
+++ b/lib/transform.js
@@ -4,16 +4,60 @@ import isArray from 'lodash/isArray';
 
 import eachOf from './eachOf';
 
-export default function transform (arr, memo, iteratee, callback) {
+/**
+ * A relative of `reduce`.  Takes an Object or Array, and iterates over each
+ * element in series, each step potentially mutating an `accumulator` value.
+ * The type of the accumulator defaults to the type of collection passed in.
+ *
+ * @name transform
+ * @static
+ * @memberOf async
+ * @category Collection
+ * @param {Array|Object} coll - A collection to iterate over.
+ * @param {*} [accumulator] - The initial state of the transform.  If omitted,
+ * it will default to an empty Object or Array, depending on the type of `coll`
+ * @param {Function} iteratee - A function applied to each item in the
+ * collection that potentially modifies the accumulator. The `iteratee` is
+ * passed a `callback(err)` which accepts an optional error as its first
+ * argument. If an error is passed to the callback, the transform is stopped
+ * and the main `callback` is immediately called with the error.
+ * Invoked with (accumulator, item, key, callback).
+ * @param {Function} [callback] - A callback which is called after all the
+ * `iteratee` functions have finished. Result is the transformed accumulator.
+ * Invoked with (err, result).
+ * @example
+ *
+ * async.transform([1,2,3], function(acc, item, index, callback) {
+ *     // pointless async:
+ *     process.nextTick(function() {
+ *         acc.push(item * 2)
+ *         callback(null)
+ *     });
+ * }, function(err, result) {
+ *     // result is now equal to [2, 4, 6]
+ * });
+ *
+ * @example
+ *
+ * async.transform({a: 1, b: 2, c: 3}, function (obj, val, key, callback) {
+ *     setImmediate(function () {
+ *         obj[key] = val * 2;
+ *         callback();
+ *     })
+ * }, function (err, result) {
+ *     // result is equal to {a: 2, b: 4, c: 6}
+ * })
+ */
+export default function transform (arr, acc, iteratee, callback) {
     if (arguments.length === 3) {
         callback = iteratee;
-        iteratee = memo;
-        memo = isArray(arr) ? [] : {};
+        iteratee = acc;
+        acc = isArray(arr) ? [] : {};
     }
 
     eachOf(arr, function(v, k, cb) {
-        iteratee(memo, v, k, cb);
+        iteratee(acc, v, k, cb);
     }, function(err) {
-        callback(err, memo);
+        callback(err, acc);
     });
 }
diff --git a/lib/unmemoize.js b/lib/unmemoize.js
index e7f0941..6b7a6f7 100644
--- a/lib/unmemoize.js
+++ b/lib/unmemoize.js
@@ -1,13 +1,13 @@
 'use strict';
 
 /**
- * Undoes a [`memoize`](#memoize)d function, reverting it to the original,
+ * Undoes a {@link async.memoize}d function, reverting it to the original,
  * unmemoized form. Handy for testing.
  *
  * @name unmemoize
  * @static
  * @memberOf async
- * @see `async.memoize`
+ * @see async.memoize
  * @category Util
  * @param {Function} fn - the memoized function
  */
diff --git a/lib/until.js b/lib/until.js
index 0c5a1aa..f5e6efa 100644
--- a/lib/until.js
+++ b/lib/until.js
@@ -7,12 +7,12 @@ import whilst from './whilst';
  * stopped, or an error occurs. `callback` will be passed an error and any
  * arguments passed to the final `fn`'s callback.
  *
- * The inverse of [`whilst`](#whilst).
+ * The inverse of {@link async.whilst}.
  *
  * @name until
  * @static
  * @memberOf async
- * @see `async.whilst`
+ * @see async.whilst
  * @category Control Flow
  * @param {Function} test - synchronous truth test to perform before each
  * execution of `fn`. Invoked with ().
diff --git a/mocha_test/apply.js b/mocha_test/apply.js
new file mode 100644
index 0000000..18e5d12
--- /dev/null
+++ b/mocha_test/apply.js
@@ -0,0 +1,21 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+
+describe('concat', function() {
+    it('apply', function(done) {
+        var fn = function(){
+            expect(Array.prototype.slice.call(arguments)).to.eql([1,2,3,4]);
+        };
+        async.apply(fn, 1, 2, 3, 4)();
+        async.apply(fn, 1, 2, 3)(4);
+        async.apply(fn, 1, 2)(3, 4);
+        async.apply(fn, 1)(2, 3, 4);
+        async.apply(fn)(1, 2, 3, 4);
+        expect(
+            async.apply(function(name){return 'hello ' + name;}, 'world')()
+        ).to.equal(
+            'hello world'
+        );
+        done();
+    });
+});
diff --git a/mocha_test/asyncify.js b/mocha_test/asyncify.js
new file mode 100644
index 0000000..507cd1a
--- /dev/null
+++ b/mocha_test/asyncify.js
@@ -0,0 +1,117 @@
+var async = require('../lib');
+var assert = require('assert');
+var expect = require('chai').expect;
+var isBrowser = require('./support/is_browser');
+
+describe('asyncify', function(done){
+
+    it('asyncify', function(done) {
+        var parse = async.asyncify(JSON.parse);
+        parse("{\"a\":1}", function (err, result) {
+            assert(!err);
+            expect(result.a).to.equal(1);
+            done();
+        });
+    });
+
+    it('asyncify null', function(done) {
+        var parse = async.asyncify(function() {
+            return null;
+        });
+        parse("{\"a\":1}", function (err, result) {
+            assert(!err);
+            expect(result).to.equal(null);
+            done();
+        });
+    });
+
+    it('variable numbers of arguments', function(done) {
+         async.asyncify(function (x, y, z) {
+             return arguments;
+         })(1, 2, 3, function (err, result) {
+             expect(result.length).to.equal(3);
+             expect(result[0]).to.equal(1);
+             expect(result[1]).to.equal(2);
+             expect(result[2]).to.equal(3);
+             done();
+         });
+     });
+
+    it('catch errors', function(done) {
+        async.asyncify(function () {
+            throw new Error("foo");
+        })(function (err) {
+            assert(err);
+            expect(err.message).to.equal("foo");
+            done();
+        });
+    });
+
+    it('dont catch errors in the callback', function(done) {
+        try {
+            async.asyncify(function () {})(function (err) {
+                if (err) {
+                    return done(new Error("should not get an error here"));
+                }
+                throw new Error("callback error");
+            });
+        } catch (err) {
+            expect(err.message).to.equal("callback error");
+            done();
+        }
+    });
+
+    describe('promisified', function() {
+        if (isBrowser()) {
+            // node only tests
+            return;
+        }
+
+        var names = [
+            'native-promise-only',
+            'bluebird',
+            'es6-promise',
+            'rsvp'
+        ];
+
+        names.forEach(function(name) {
+            describe(name, function() {
+
+                var Promise = require(name);
+                if (typeof Promise.Promise === 'function') {
+                    Promise = Promise.Promise;
+                }
+
+                it('resolve', function(done) {
+                    var promisified = function(argument) {
+                        return new Promise(function (resolve) {
+                            setTimeout(function () {
+                                resolve(argument + " resolved");
+                            }, 15);
+                        });
+                    };
+                    async.asyncify(promisified)("argument", function (err, value) {
+                        if (err) {
+                            return done(new Error("should not get an error here"));
+                        }
+                        expect(value).to.equal("argument resolved");
+                        done();
+                    });
+                });
+
+                it('reject', function(done) {
+                    var promisified = function(argument) {
+                        return new Promise(function (resolve, reject) {
+                            reject(argument + " rejected");
+                        });
+                    };
+                    async.asyncify(promisified)("argument", function (err) {
+                        assert(err);
+                        expect(err.message).to.equal("argument rejected");
+                        done();
+                    });
+                });
+            });
+        });
+    });
+});
diff --git a/mocha_test/auto.js b/mocha_test/auto.js
index fb779ee..6d30815 100644
--- a/mocha_test/auto.js
+++ b/mocha_test/auto.js
@@ -305,6 +305,23 @@ describe('auto', function () {
         done();
     });
 
+    // Issue 1092 on github: https://github.com/caolan/async/issues/1092
+    it('extended cycle detection', function(done) {
+        var task = function (name) {
+            return function (results, callback) {
+                callback(null, 'task ' + name);
+            };
+        };
+        expect(function () {
+            async.auto({
+                a: ['c', task('a')],
+                b: ['a', task('b')],
+                c: ['b', task('c')]
+            });
+        }).to.throw();
+        done();
+    });
+
     // Issue 988 on github: https://github.com/caolan/async/issues/988
     it('auto stops running tasks on error', function(done) {
         async.auto({
@@ -349,6 +366,18 @@ describe('auto', function () {
         }).to.throw();
     });
 
+    it('should handle array tasks with just a function', function (done) {
+        async.auto({
+            a: [function (cb) {
+                cb(null, 1);
+            }],
+            b: ["a", function (results, cb) {
+                expect(results.a).to.equal(1);
+                cb();
+            }]
+        }, done);
+    });
+
     it("should avoid unncecessary deferrals", function (done) {
         var isSync = true;
 
diff --git a/mocha_test/autoInject.js b/mocha_test/autoInject.js
index b90125b..39c99a4 100644
--- a/mocha_test/autoInject.js
+++ b/mocha_test/autoInject.js
@@ -74,6 +74,18 @@ describe('autoInject', function () {
         });
     });
 
+    it('should handle array tasks with just a function', function (done) {
+        async.autoInject({
+            a: [function (cb) {
+                cb(null, 1);
+            }],
+            b: ["a", function (a, cb) {
+                expect(a).to.equal(1);
+                cb();
+            }]
+        }, done);
+    });
+
     var arrowSupport = true;
     try {
         /* jshint -W054 */
@@ -103,5 +115,4 @@ describe('autoInject', function () {
         )();
         /* jshint +W061 */
     }
-
 });
diff --git a/mocha_test/concat.js b/mocha_test/concat.js
new file mode 100644
index 0000000..389b2de
--- /dev/null
+++ b/mocha_test/concat.js
@@ -0,0 +1,57 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('concat', function() {
+    it('concat', function(done) {
+        var call_order = [];
+        var iteratee = function (x, cb) {
+            setTimeout(function(){
+                call_order.push(x);
+                var r = [];
+                while (x > 0) {
+                    r.push(x);
+                    x--;
+                }
+                cb(null, r);
+            }, x*25);
+        };
+        async.concat([1,3,2], iteratee, function(err, results){
+            expect(results).to.eql([1,2,1,3,2,1]);
+            expect(call_order).to.eql([1,2,3]);
+            assert(err === null, err + " passed instead of 'null'");
+            done();
+        });
+    });
+
+    it('concat error', function(done) {
+        var iteratee = function (x, cb) {
+            cb(new Error('test error'));
+        };
+        async.concat([1,2,3], iteratee, function(err){
+            assert(err);
+            done();
+        });
+    });
+
+    it('concatSeries', function(done) {
+        var call_order = [];
+        var iteratee = function (x, cb) {
+            setTimeout(function(){
+                call_order.push(x);
+                var r = [];
+                while (x > 0) {
+                    r.push(x);
+                    x--;
+                }
+                cb(null, r);
+            }, x*25);
+        };
+        async.concatSeries([1,3,2], iteratee, function(err, results){
+            expect(results).to.eql([1,3,2,1,2,1]);
+            expect(call_order).to.eql([1,3,2]);
+            assert(err === null, err + " passed instead of 'null'");
+            done();
+        });
+    });
+});
diff --git a/mocha_test/consoleFunctions.js b/mocha_test/consoleFunctions.js
new file mode 100644
index 0000000..616ac1d
--- /dev/null
+++ b/mocha_test/consoleFunctions.js
@@ -0,0 +1,71 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('console functions', function() {
+
+    var names = [
+        'log',
+        'dir',
+        /* 'info'
+        'warn'
+        'error' */
+    ];
+
+    // generates tests for console functions such as async.log
+    names.forEach(function(name) {
+        if (typeof console !== 'undefined') {
+            it(name, function(done) {
+                var fn = function(arg1, callback){
+                    expect(arg1).to.equal('one');
+                    setTimeout(function(){callback(null, 'test');}, 0);
+                };
+                var fn_err = function(arg1, callback){
+                    expect(arg1).to.equal('one');
+                    setTimeout(function(){callback('error');}, 0);
+                };
+                var _console_fn = console[name];
+                var _error = console.error;
+                console[name] = function(val){
+                    expect(val).to.equal('test');
+                    expect(arguments.length).to.equal(1);
+                    console.error = function(val){
+                        expect(val).to.equal('error');
+                        console[name] = _console_fn;
+                        console.error = _error;
+                        done();
+                    };
+                    async[name](fn_err, 'one');
+                };
+                async[name](fn, 'one');
+            });
+
+            it(name + ' with multiple result params', function(done) {
+                var fn = function(callback){callback(null,'one','two','three');};
+                var _console_fn = console[name];
+                var called_with = [];
+                console[name] = function(x){
+                    called_with.push(x);
+                };
+                async[name](fn);
+                expect(called_with).to.eql(['one','two','three']);
+                console[name] = _console_fn;
+                done();
+            });
+        }
+
+        // browser-only test
+        if (typeof window !== 'undefined') {
+            it(name + ' without console.' + name, function(done) {
+                var _console = window.console;
+                window.console = undefined;
+                var fn = function(callback){callback(null, 'val');};
+                var fn_err = function(callback){callback('error');};
+                async[name](fn);
+                async[name](fn_err);
+                window.console = _console;
+                done();
+            });
+        }
+    });
+});
diff --git a/mocha_test/during.js b/mocha_test/during.js
new file mode 100644
index 0000000..851acf1
--- /dev/null
+++ b/mocha_test/during.js
@@ -0,0 +1,97 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('during', function() {
+
+    it('during', function(done) {
+        var call_order = [];
+
+        var count = 0;
+        async.during(
+            function (cb) {
+                call_order.push(['test', count]);
+                cb(null, count < 5);
+            },
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb();
+            },
+            function (err) {
+                assert(err === null, err + " passed instead of 'null'");
+                expect(call_order).to.eql([
+                    ['test', 0],
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5],
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+
+    it('doDuring', function(done) {
+        var call_order = [];
+
+        var count = 0;
+        async.doDuring(
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb();
+            },
+            function (cb) {
+                call_order.push(['test', count]);
+                cb(null, count < 5);
+            },
+            function (err) {
+                assert(err === null, err + " passed instead of 'null'");
+                expect(call_order).to.eql([
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5],
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+
+    it('doDuring - error test', function(done) {
+        var error = new Error('asdas');
+
+        async.doDuring(
+            function (cb) {
+                cb(error);
+            },
+            function () {},
+            function (err) {
+                expect(err).to.equal(error);
+                done();
+            }
+        );
+    });
+
+    it('doDuring - error iteratee', function(done) {
+        var error = new Error('asdas');
+
+        async.doDuring(
+            function (cb) {
+                cb(null);
+            },
+            function (cb) {
+                cb(error);
+            },
+            function (err) {
+                expect(err).to.equal(error);
+                done();
+            }
+        );
+    });
+});
diff --git a/mocha_test/each.js b/mocha_test/each.js
new file mode 100644
index 0000000..014e9df
--- /dev/null
+++ b/mocha_test/each.js
@@ -0,0 +1,283 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe("each", function() {
+
+    function eachIteratee(args, x, callback) {
+        setTimeout(function(){
+            args.push(x);
+            callback();
+        }, x*25);
+    }
+
+    function eachNoCallbackIteratee(done, x, callback) {
+        expect(x).to.equal(1);
+        callback();
+        done();
+    }
+
+    it('each', function(done) {
+        var args = [];
+        async.each([1,3,2], eachIteratee.bind(this, args), function(err){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(args).to.eql([1,2,3]);
+            done();
+        });
+    });
+
+    it('each extra callback', function(done) {
+        var count = 0;
+        async.each([1,3,2], function(val, callback) {
+            count++;
+            var done_ = count == 3;
+            callback();
+            assert.throws(callback);
+            if (done_) {
+                done();
+            }
+        });
+    });
+
+    it('each empty array', function(done) {
+        async.each([], function(x, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+
+    it('each empty array, with other property on the array', function(done) {
+        var myArray = [];
+        myArray.myProp = "anything";
+        async.each(myArray, function(x, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+
+    it('each error', function(done) {
+        async.each([1,2,3], function(x, callback){
+            callback('error');
+        }, function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('each no callback', function(done) {
+        async.each([1], eachNoCallbackIteratee.bind(this, done));
+    });
+
+    it('eachSeries', function(done) {
+        var args = [];
+        async.eachSeries([1,3,2], eachIteratee.bind(this, args), function(err){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(args).to.eql([1,3,2]);
+            done();
+        });
+    });
+
+    it('eachSeries empty array', function(done) {
+        async.eachSeries([], function(x, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('eachSeries array modification', function(done) {
+        var arr = [1, 2, 3, 4];
+        async.eachSeries(arr, function (x, callback) {
+            async.setImmediate(callback);
+        }, function () {
+            assert(true, 'should call callback');
+        });
+
+        arr.pop();
+        arr.splice(0, 1);
+
+        setTimeout(done, 50);
+    });
+
+    // bug #782.  Remove in next major release
+    it('eachSeries single item', function(done) {
+        var sync = true;
+        async.eachSeries([1], function (i, cb) {
+            cb(null);
+        }, function () {
+            assert(sync, "callback not called on same tick");
+        });
+        sync = false;
+        done();
+    });
+
+    // bug #782.  Remove in next major release
+    it('eachSeries single item', function(done) {
+        var sync = true;
+        async.eachSeries([1], function (i, cb) {
+            cb(null);
+        }, function () {
+            assert(sync, "callback not called on same tick");
+        });
+        sync = false;
+        done();
+    });
+
+    it('eachSeries error', function(done) {
+        var call_order = [];
+        async.eachSeries([1,2,3], function(x, callback){
+            call_order.push(x);
+            callback('error');
+        }, function(err){
+            expect(call_order).to.eql([1]);
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('eachSeries no callback', function(done) {
+        async.eachSeries([1], eachNoCallbackIteratee.bind(this, done));
+    });
+
+
+    it('eachLimit', function(done) {
+        var args = [];
+        var arr = [0,1,2,3,4,5,6,7,8,9];
+        async.eachLimit(arr, 2, function(x,callback){
+            setTimeout(function(){
+                args.push(x);
+                callback();
+            }, x*5);
+        }, function(err){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(args).to.eql(arr);
+            done();
+        });
+    });
+
+    it('eachLimit empty array', function(done) {
+        async.eachLimit([], 2, function(x, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('eachLimit limit exceeds size', function(done) {
+        var args = [];
+        var arr = [0,1,2,3,4,5,6,7,8,9];
+        async.eachLimit(arr, 20, eachIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql(arr);
+            done();
+        });
+    });
+
+    it('eachLimit limit equal size', function(done) {
+        var args = [];
+        var arr = [0,1,2,3,4,5,6,7,8,9];
+        async.eachLimit(arr, 10, eachIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql(arr);
+            done();
+        });
+    });
+
+    it('eachLimit zero limit', function(done) {
+        async.eachLimit([0,1,2,3,4,5], 0, function(x, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('eachLimit error', function(done) {
+        var arr = [0,1,2,3,4,5,6,7,8,9];
+        var call_order = [];
+
+        async.eachLimit(arr, 3, function(x, callback){
+            call_order.push(x);
+            if (x === 2) {
+                callback('error');
+            }
+        }, function(err){
+            expect(call_order).to.eql([0,1,2]);
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('eachLimit no callback', function(done) {
+        async.eachLimit([1], 1, eachNoCallbackIteratee.bind(this, done));
+    });
+
+    it('eachLimit synchronous', function(done) {
+        var args = [];
+        var arr = [0,1,2];
+        async.eachLimit(arr, 5, function(x,callback){
+            args.push(x);
+            callback();
+        }, function(err){
+            if (err) throw err;
+            expect(args).to.eql(arr);
+            done();
+        });
+    });
+
+    it('eachLimit does not continue replenishing after error', function(done) {
+        var started = 0;
+        var arr = [0,1,2,3,4,5,6,7,8,9];
+        var delay = 10;
+        var limit = 3;
+        var maxTime = 10 * arr.length;
+
+        async.eachLimit(arr, limit, function(x, callback) {
+            started ++;
+            if (started === 3) {
+                return callback(new Error ("Test Error"));
+            }
+            setTimeout(function(){
+                callback();
+            }, delay);
+        }, function(){});
+
+        setTimeout(function(){
+            expect(started).to.equal(3);
+            done();
+        }, maxTime);
+    });
+
+    it('forEach alias', function(done) {
+        assert.strictEqual(async.each, async.forEach);
+        done();
+    });
+
+    it('forEachSeries alias', function(done) {
+        assert.strictEqual(async.eachSeries, async.forEachSeries);
+        done();
+    });
+
+    it('forEachLimit alias', function(done) {
+        assert.strictEqual(async.eachLimit, async.forEachLimit);
+        done();
+    });
+});
diff --git a/mocha_test/eachOf.js b/mocha_test/eachOf.js
new file mode 100644
index 0000000..c705bad
--- /dev/null
+++ b/mocha_test/eachOf.js
@@ -0,0 +1,333 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe("eachOf", function() {
+
+    function forEachOfNoCallbackIteratee(done, x, key, callback) {
+        expect(x).to.equal(1);
+        expect(key).to.equal("a");
+        callback();
+        done();
+    }
+
+    function forEachOfIteratee(args, value, key, callback) {
+        setTimeout(function(){
+            args.push(key, value);
+            callback();
+        }, value*25);
+    }
+
+    it('eachOf alias', function(done) {
+        expect(async.eachOf).to.equal(async.forEachOf);
+        done();
+    });
+
+    it('eachOfLimit alias', function(done) {
+        expect(async.eachOfLimit).to.equal(async.forEachOfLimit);
+        done();
+    });
+
+    it('eachOfSeries alias', function(done) {
+        expect(async.eachOfSeries).to.equal(async.forEachOfSeries);
+        done();
+    });
+
+    it('forEachOf', function(done) {
+        var args = [];
+        async.forEachOf({ a: 1, b: 2 }, forEachOfIteratee.bind(this, args), function(err){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(args).to.eql(["a", 1, "b", 2]);
+            done();
+        });
+    });
+
+    it('forEachOf - instant resolver', function(done) {
+        var args = [];
+        async.forEachOf({ a: 1, b: 2 }, function(x, k, cb) {
+            args.push(k, x);
+            cb();
+        }, function(){
+            // ensures done callback isn't called before all items iterated
+            expect(args).to.eql(["a", 1, "b", 2]);
+            done();
+        });
+    });
+
+    it('forEachOf empty object', function(done) {
+        async.forEachOf({}, function(value, key, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err) {
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('forEachOf empty array', function(done) {
+        async.forEachOf([], function(value, key, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err) {
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('forEachOf error', function(done) {
+        async.forEachOf({ a: 1, b: 2 }, function(value, key, callback) {
+            callback('error');
+        }, function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('forEachOf no callback', function(done) {
+        async.forEachOf({ a: 1 }, forEachOfNoCallbackIteratee.bind(this, done));
+    });
+
+
+    it('forEachOf with array', function(done) {
+        var args = [];
+        async.forEachOf([ "a", "b" ], forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([0, "a", 1, "b"]);
+            done();
+        });
+    });
+
+    it('forEachOf with Set (iterators)', function(done) {
+        if (typeof Set !== 'function')
+            return done();
+
+        var args = [];
+        var set = new Set();
+        set.add("a");
+        set.add("b");
+        async.forEachOf(set, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([0, "a", 1, "b"]);
+            done();
+        });
+    });
+
+    it('forEachOf with Map (iterators)', function(done) {
+        if (typeof Map !== 'function')
+            return done();
+
+        var args = [];
+        var map = new Map();
+        map.set(1, "a");
+        map.set(2, "b");
+        async.forEachOf(map, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([0, [1, "a"], 1, [2, "b"]]);
+            done();
+        });
+    });
+
+    it('forEachOfSeries', function(done) {
+        var args = [];
+        async.forEachOfSeries({ a: 1, b: 2 }, forEachOfIteratee.bind(this, args), function(err){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(args).to.eql([ "a", 1, "b", 2 ]);
+            done();
+        });
+    });
+
+    it('forEachOfSeries empty object', function(done) {
+        async.forEachOfSeries({}, function(x, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('forEachOfSeries error', function(done) {
+        var call_order = [];
+        async.forEachOfSeries({ a: 1, b: 2 }, function(value, key, callback){
+            call_order.push(value, key);
+            callback('error');
+        }, function(err){
+            expect(call_order).to.eql([ 1, "a" ]);
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('forEachOfSeries no callback', function(done) {
+        async.forEachOfSeries({ a: 1 }, forEachOfNoCallbackIteratee.bind(this, done));
+    });
+
+    it('forEachOfSeries with array', function(done) {
+        var args = [];
+        async.forEachOfSeries([ "a", "b" ], forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([ 0, "a", 1, "b" ]);
+            done();
+        });
+    });
+
+    it('forEachOfSeries with Set (iterators)', function(done) {
+        if (typeof Set !== 'function')
+            return done();
+
+        var args = [];
+        var set = new Set();
+        set.add("a");
+        set.add("b");
+        async.forEachOfSeries(set, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([0, "a", 1, "b"]);
+            done();
+        });
+    });
+
+    it('forEachOfSeries with Map (iterators)', function(done) {
+        if (typeof Map !== 'function')
+            return done();
+
+        var args = [];
+        var map = new Map();
+        map.set(1, "a");
+        map.set(2, "b");
+        async.forEachOfSeries(map, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([0, [1, "a"], 1, [2, "b"]]);
+            done();
+        });
+    });
+
+    it('forEachOfLimit', function(done) {
+        var args = [];
+        var obj = { a: 1, b: 2, c: 3, d: 4 };
+        async.forEachOfLimit(obj, 2, function(value, key, callback){
+            setTimeout(function(){
+                args.push(value, key);
+                callback();
+            }, value * 5);
+        }, function(err){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(args).to.eql([ 1, "a", 2, "b", 3, "c", 4, "d" ]);
+            done();
+        });
+    });
+
+    it('forEachOfLimit empty object', function(done) {
+        async.forEachOfLimit({}, 2, function(value, key, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('forEachOfLimit limit exceeds size', function(done) {
+        var args = [];
+        var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
+        async.forEachOfLimit(obj, 10, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([ "a", 1, "b", 2, "c", 3, "d", 4, "e", 5 ]);
+            done();
+        });
+    });
+
+    it('forEachOfLimit limit equal size', function(done) {
+        var args = [];
+        var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
+        async.forEachOfLimit(obj, 5, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([ "a", 1, "b", 2, "c", 3, "d", 4, "e", 5 ]);
+            done();
+        });
+    });
+
+    it('forEachOfLimit zero limit', function(done) {
+        async.forEachOfLimit({ a: 1, b: 2 }, 0, function(x, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('forEachOfLimit error', function(done) {
+        var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
+        var call_order = [];
+
+        async.forEachOfLimit(obj, 3, function(value, key, callback){
+            call_order.push(value, key);
+            if (value === 2) {
+                callback('error');
+            }
+        }, function(err){
+            expect(call_order).to.eql([ 1, "a", 2, "b" ]);
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('forEachOfLimit no callback', function(done) {
+        async.forEachOfLimit({ a: 1 }, 1, forEachOfNoCallbackIteratee.bind(this, done));
+    });
+
+    it('forEachOfLimit synchronous', function(done) {
+        var args = [];
+        var obj = { a: 1, b: 2 };
+        async.forEachOfLimit(obj, 5, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([ "a", 1, "b", 2 ]);
+            done();
+        });
+    });
+
+    it('forEachOfLimit with array', function(done) {
+        var args = [];
+        var arr = [ "a", "b" ];
+        async.forEachOfLimit(arr, 1, forEachOfIteratee.bind(this, args), function (err) {
+            if (err) throw err;
+            expect(args).to.eql([ 0, "a", 1, "b" ]);
+            done();
+        });
+    });
+
+    it('forEachOfLimit with Set (iterators)', function(done) {
+        if (typeof Set !== 'function')
+            return done();
+
+        var args = [];
+        var set = new Set();
+        set.add("a");
+        set.add("b");
+        async.forEachOfLimit(set, 1, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([0, "a", 1, "b"]);
+            done();
+        });
+    });
+
+    it('forEachOfLimit with Map (iterators)', function(done) {
+        if (typeof Map !== 'function')
+            return done();
+
+        var args = [];
+        var map = new Map();
+        map.set(1, "a");
+        map.set(2, "b");
+        async.forEachOfLimit(map, 1, forEachOfIteratee.bind(this, args), function(err){
+            if (err) throw err;
+            expect(args).to.eql([0, [1, "a"], 1, [2, "b"]]);
+            done();
+        });
+    });
+});
diff --git a/mocha_test/ensureAsync.js b/mocha_test/ensureAsync.js
index c33e344..fd8cc3f 100644
--- a/mocha_test/ensureAsync.js
+++ b/mocha_test/ensureAsync.js
@@ -1,11 +1,64 @@
 var async = require('../lib');

 var expect = require('chai').expect;

+var assert = require('assert');

 

 describe('ensureAsync', function() {

     var passContext = function(cb) {

         cb(this);

     };

 

+    it('defer sync functions', function(done) {

+        var sync = true;

+        async.ensureAsync(function (arg1, arg2, cb) {

+            expect(arg1).to.equal(1);

+            expect(arg2).to.equal(2);

+            cb(null, 4, 5);

+        })(1, 2, function (err, arg4, arg5) {

+            expect(err).to.equal(null);

+            expect(arg4).to.equal(4);

+            expect(arg5).to.equal(5);

+            assert(!sync, 'callback called on same tick');

+            done();

+        });

+        sync = false;

+    });

+

+    it('do not defer async functions', function(done) {

+        var sync = false;

+        async.ensureAsync(function (arg1, arg2, cb) {

+            expect(arg1).to.equal(1);

+            expect(arg2).to.equal(2);

+            async.setImmediate(function () {

+                sync = true;

+                cb(null, 4, 5);

+                sync = false;

+            });

+        })(1, 2, function (err, arg4, arg5) {

+            expect(err).to.equal(null);

+            expect(arg4).to.equal(4);

+            expect(arg5).to.equal(5);

+            assert(sync, 'callback called on next tick');

+            done();

+        });

+    });

+

+    it('double wrapping', function(done) {

+        var sync = true;

+        async.ensureAsync(async.ensureAsync(function (arg1, arg2, cb) {

+            expect(arg1).to.equal(1);

+            expect(arg2).to.equal(2);

+            cb(null, 4, 5);

+        }))(1, 2, function (err, arg4, arg5) {

+            expect(err).to.equal(null);

+            expect(arg4).to.equal(4);

+            expect(arg5).to.equal(5);

+            assert(!sync, 'callback called on same tick');

+            done();

+        });

+        sync = false;

+    });

+

+

     it('should propely bind context to the wrapped function', function(done) {

 

         // call bind after wrapping with ensureAsync

diff --git a/mocha_test/iterator.js b/mocha_test/iterator.js
new file mode 100644
index 0000000..71c477c
--- /dev/null
+++ b/mocha_test/iterator.js
@@ -0,0 +1,61 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+
+describe('iterator', function() {
+
+    it('iterator', function(done) {
+        var call_order = [];
+        var iterator = async.iterator([
+            function(){call_order.push(1);},
+            function(arg1){
+                expect(arg1).to.equal('arg1');
+                call_order.push(2);
+            },
+            function(arg1, arg2){
+                expect(arg1).to.equal('arg1');
+                expect(arg2).to.equal('arg2');
+                call_order.push(3);
+            }
+        ]);
+        iterator();
+        expect(call_order).to.eql([1]);
+        var iterator2 = iterator();
+        expect(call_order).to.eql([1,1]);
+        var iterator3 = iterator2('arg1');
+        expect(call_order).to.eql([1,1,2]);
+        var iterator4 = iterator3('arg1', 'arg2');
+        expect(call_order).to.eql([1,1,2,3]);
+        expect(iterator4).to.equal(null);
+        done();
+    });
+
+    it('iterator empty array', function(done) {
+        var iterator = async.iterator([]);
+        expect(iterator()).to.equal(null);
+        expect(iterator.next()).to.equal(null);
+        done();
+    });
+
+    it('iterator.next', function(done) {
+        var call_order = [];
+        var iterator = async.iterator([
+            function(){call_order.push(1);},
+            function(arg1){
+                expect(arg1).to.equal('arg1');
+                call_order.push(2);
+            },
+            function(arg1, arg2){
+                expect(arg1).to.equal('arg1');
+                expect(arg2).to.equal('arg2');
+                call_order.push(3);
+            }
+        ]);
+        var fn = iterator.next();
+        var iterator2 = fn('arg1');
+        expect(call_order).to.eql([2]);
+        iterator2('arg1','arg2');
+        expect(call_order).to.eql([2,3]);
+        expect(iterator2.next()).to.equal(null);
+        done();
+    });
+});
diff --git a/mocha_test/map.js b/mocha_test/map.js
new file mode 100644
index 0000000..a537427
--- /dev/null
+++ b/mocha_test/map.js
@@ -0,0 +1,311 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe("map", function() {
+
+    function mapIteratee(call_order, x, callback) {
+        setTimeout(function() {
+            call_order.push(x);
+            callback(null, x * 2);
+        }, x * 25);
+    }
+
+    it('basic', function(done) {
+        var call_order = [];
+        async.map([1, 3, 2], mapIteratee.bind(this, call_order), function(err, results) {
+            assert(err === null, err + " passed instead of 'null'");
+            expect(call_order).to.eql([1, 2, 3]);
+            expect(results).to.eql([2, 6, 4]);
+            done();
+        });
+    });
+
+    it('with reflect', function(done) {
+        var call_order = [];
+        async.map([1, 3, 2], async.reflect(function(item, cb) {
+            setTimeout(function() {
+                call_order.push(item);
+                cb(null, item * 2);
+            }, item * 25);
+        }), function(err, results) {
+            assert(err === null, err + " passed instead of 'null'");
+            expect(call_order).to.eql([1, 2, 3]);
+            expect(results).to.eql([{
+                value: 2
+            }, {
+                value: 6
+            }, {
+                value: 4
+            }]);
+            done();
+        });
+    });
+
+    it('error with reflect', function(done) {
+        var call_order = [];
+        async.map([-1, 1, 3, 2], async.reflect(function(item, cb) {
+            setTimeout(function() {
+                call_order.push(item);
+                if (item < 0) {
+                    cb('number less then zero');
+                } else {
+                    cb(null, item * 2);
+                }
+            }, item * 25);
+        }), function(err, results) {
+            assert(err === null, err + " passed instead of 'null'");
+            expect(call_order).to.eql([-1, 1, 2, 3]);
+            expect(results).to.eql([{
+                error: 'number less then zero'
+            }, {
+                value: 2
+            }, {
+                value: 6
+            }, {
+                value: 4
+            }]);
+            done();
+        });
+    });
+
+    it('map original untouched', function(done) {
+        var a = [1, 2, 3];
+        async.map(a, function(x, callback) {
+            callback(null, x * 2);
+        }, function(err, results) {
+            expect(results).to.eql([2, 4, 6]);
+            expect(a).to.eql([1, 2, 3]);
+            done();
+        });
+    });
+
+    it('map without main callback', function(done) {
+        var a = [1, 2, 3];
+        var r = [];
+        async.map(a, function(x, callback) {
+            r.push(x);
+            var done_ = r.length == a.length;
+            callback(null);
+            if (done_) {
+                expect(r).to.eql(a);
+                done();
+            }
+        });
+    });
+
+    it('map error', function(done) {
+        async.map([1, 2, 3], function(x, callback) {
+            callback('error');
+        }, function(err) {
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('map undefined array', function(done) {
+        async.map(undefined, function(x, callback) {
+            callback();
+        }, function(err, result) {
+            expect(err).to.equal(null);
+            expect(result).to.eql([]);
+        });
+        setTimeout(done, 50);
+    });
+
+    it('map object', function(done) {
+        async.map({
+            a: 1,
+            b: 2,
+            c: 3
+        }, function(val, callback) {
+            callback(null, val * 2);
+        }, function(err, result) {
+            if (err) throw err;
+            expect(Object.prototype.toString.call(result)).to.equal('[object Object]');
+            expect(result).to.eql({
+                a: 2,
+                b: 4,
+                c: 6
+            });
+            done();
+        });
+    });
+
+    it('mapSeries', function(done) {
+        var call_order = [];
+        async.mapSeries([1, 3, 2], mapIteratee.bind(this, call_order), function(err, results) {
+            assert(err === null, err + " passed instead of 'null'");
+            expect(call_order).to.eql([1, 3, 2]);
+            expect(results).to.eql([2, 6, 4]);
+            done();
+        });
+    });
+
+    it('mapSeries error', function(done) {
+        async.mapSeries([1, 2, 3], function(x, callback) {
+            callback('error');
+        }, function(err) {
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('mapSeries undefined array', function(done) {
+        async.mapSeries(undefined, function(x, callback) {
+            callback();
+        }, function(err, result) {
+            expect(err).to.equal(null);
+            expect(result).to.eql([]);
+        });
+        setTimeout(done, 50);
+    });
+
+    it('mapSeries object', function(done) {
+        async.mapSeries({
+            a: 1,
+            b: 2,
+            c: 3
+        }, function(val, callback) {
+            callback(null, val * 2);
+        }, function(err, result) {
+            if (err) throw err;
+            expect(result).to.eql({
+                a: 2,
+                b: 4,
+                c: 6
+            });
+            done();
+        });
+    });
+
+    it('mapLimit', function(done) {
+        var call_order = [];
+        async.mapLimit([2, 4, 3], 2, mapIteratee.bind(this, call_order), function(err, results) {
+            assert(err === null, err + " passed instead of 'null'");
+            expect(call_order).to.eql([2, 4, 3]);
+            expect(results).to.eql([4, 8, 6]);
+            done();
+        });
+    });
+
+    it('mapLimit empty array', function(done) {
+        async.mapLimit([], 2, function(x, callback) {
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err) {
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('mapLimit undefined array', function(done) {
+        async.mapLimit(undefined, 2, function(x, callback) {
+            callback();
+        }, function(err, result) {
+            expect(err).to.equal(null);
+            expect(result).to.eql([]);
+        });
+        setTimeout(done, 50);
+    });
+
+    it('mapLimit limit exceeds size', function(done) {
+        var call_order = [];
+        async.mapLimit([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 20, mapIteratee.bind(this, call_order), function(err, results) {
+            expect(call_order).to.eql([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
+            expect(results).to.eql([0, 2, 4, 6, 8, 10, 12, 14, 16, 18]);
+            done();
+        });
+    });
+
+    it('mapLimit limit equal size', function(done) {
+        var call_order = [];
+        async.mapLimit([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 10, mapIteratee.bind(this, call_order), function(err, results) {
+            expect(call_order).to.eql([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
+            expect(results).to.eql([0, 2, 4, 6, 8, 10, 12, 14, 16, 18]);
+            done();
+        });
+    });
+
+    it('mapLimit zero limit', function(done) {
+        async.mapLimit([0, 1, 2, 3, 4, 5], 0, function(x, callback) {
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err, results) {
+            expect(results).to.eql([]);
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('mapLimit error', function(done) {
+        var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+        var call_order = [];
+
+        async.mapLimit(arr, 3, function(x, callback) {
+            call_order.push(x);
+            if (x === 2) {
+                callback('error');
+            }
+        }, function(err) {
+            expect(call_order).to.eql([0, 1, 2]);
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('mapLimit does not continue replenishing after error', function(done) {
+        var started = 0;
+        var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+        var delay = 10;
+        var limit = 3;
+        var maxTime = 10 * arr.length;
+
+        async.mapLimit(arr, limit, function(x, callback) {
+            started++;
+            if (started === 3) {
+                return callback(new Error("Test Error"));
+            }
+            setTimeout(function() {
+                callback();
+            }, delay);
+        }, function() {});
+
+        setTimeout(function() {
+            expect(started).to.equal(3);
+            done();
+        }, maxTime);
+    });
+
+    it('map with Map', function(done) {
+        if (typeof Map !== 'function')
+            return done();
+
+        var map = new Map();
+        map.set(1, "a");
+        map.set(2, "b");
+        async.map(map, function(val, cb) {
+            cb(null, val);
+        }, function(err, result) {
+            assert(Array.isArray(result), "map should return an array for an iterable");
+            done();
+        });
+    });
+
+    // Issue 1106 on github: https://github.com/caolan/async/issues/1106
+    it('map main callback is called only once', function(done) {
+        async.map([1, 2], function(item, callback) {
+            try {
+                callback(item);
+            } catch (exception) {
+                expect(function() {
+                    callback(exception);
+                }).to.throw(/already called/);
+                done();
+            }
+        }, function(err) {
+            no_such_function();
+        });
+    });
+});
diff --git a/mocha_test/memoize.js b/mocha_test/memoize.js
new file mode 100644
index 0000000..1a6e886
--- /dev/null
+++ b/mocha_test/memoize.js
@@ -0,0 +1,208 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe("memoize", function() {
+
+    it('memoize', function(done) {
+        var call_order = [];
+
+        var fn = function (arg1, arg2, callback) {
+            async.setImmediate(function () {
+                call_order.push(['fn', arg1, arg2]);
+                callback(null, arg1 + arg2);
+            });
+        };
+
+        var fn2 = async.memoize(fn);
+        fn2(1, 2, function (err, result) {
+            assert(err === null, err + " passed instead of 'null'");
+            expect(result).to.equal(3);
+            fn2(1, 2, function (err, result) {
+                expect(result).to.equal(3);
+                fn2(2, 2, function (err, result) {
+                    expect(result).to.equal(4);
+                    expect(call_order).to.eql([['fn',1,2], ['fn',2,2]]);
+                    done();
+                });
+            });
+        });
+    });
+
+    it('maintains asynchrony', function(done) {
+        var call_order = [];
+
+        var fn = function (arg1, arg2, callback) {
+            call_order.push(['fn', arg1, arg2]);
+            async.setImmediate(function () {
+                call_order.push(['cb', arg1, arg2]);
+                callback(null, arg1 + arg2);
+            });
+        };
+
+        var fn2 = async.memoize(fn);
+        fn2(1, 2, function (err, result) {
+            expect(result).to.equal(3);
+            fn2(1, 2, function (err, result) {
+                expect(result).to.equal(3);
+                async.nextTick(memoize_done);
+                call_order.push('tick3');
+            });
+            call_order.push('tick2');
+        });
+        call_order.push('tick1');
+
+        function memoize_done() {
+            var async_call_order = [
+                ['fn',1,2],             // initial async call
+                'tick1',                // async caller
+                ['cb',1,2],             // async callback
+            //  ['fn',1,2], // memoized // memoized async body
+                'tick2',                // handler for first async call
+            //  ['cb',1,2], // memoized // memoized async response body
+                'tick3'                 // handler for memoized async call
+            ];
+            expect(call_order).to.eql(async_call_order);
+            done();
+        }
+    });
+
+    it('unmemoize', function(done) {
+        var call_order = [];
+
+        var fn = function (arg1, arg2, callback) {
+            call_order.push(['fn', arg1, arg2]);
+            async.setImmediate(function () {
+                callback(null, arg1 + arg2);
+            });
+        };
+
+        var fn2 = async.memoize(fn);
+        var fn3 = async.unmemoize(fn2);
+        fn3(1, 2, function (err, result) {
+            expect(result).to.equal(3);
+            fn3(1, 2, function (err, result) {
+                expect(result).to.equal(3);
+                fn3(2, 2, function (err, result) {
+                    expect(result).to.equal(4);
+                    expect(call_order).to.eql([['fn',1,2], ['fn',1,2], ['fn',2,2]]);
+                    done();
+                });
+            });
+        });
+    });
+
+    it('unmemoize a not memoized function', function(done) {
+        var fn = function (arg1, arg2, callback) {
+            callback(null, arg1 + arg2);
+        };
+
+        var fn2 = async.unmemoize(fn);
+        fn2(1, 2, function(err, result) {
+            expect(result).to.equal(3);
+        });
+
+        done();
+    });
+
+    it('error', function(done) {
+        var testerr = new Error('test');
+        var fn = function (arg1, arg2, callback) {
+            callback(testerr, arg1 + arg2);
+        };
+        async.memoize(fn)(1, 2, function (err) {
+            expect(err).to.equal(testerr);
+        });
+        done();
+    });
+
+    it('multiple calls', function(done) {
+        var fn = function (arg1, arg2, callback) {
+            assert(true);
+            setTimeout(function(){
+                callback(null, arg1, arg2);
+            }, 10);
+        };
+        var fn2 = async.memoize(fn);
+        fn2(1, 2, function(err, result) {
+            expect(result).to.equal(1, 2);
+        });
+        fn2(1, 2, function(err, result) {
+            expect(result).to.equal(1, 2);
+            done();
+        });
+    });
+
+    it('custom hash function', function(done) {
+        var testerr = new Error('test');
+
+        var fn = function (arg1, arg2, callback) {
+            callback(testerr, arg1 + arg2);
+        };
+        var fn2 = async.memoize(fn, function () {
+            return 'custom hash';
+        });
+        fn2(1, 2, function (err, result) {
+            expect(result).to.equal(3);
+            fn2(2, 2, function (err, result) {
+                expect(result).to.equal(3);
+                done();
+            });
+        });
+    });
+
+    it('manually added memo value', function(done) {
+        var fn = async.memoize(function() {
+            test(false, "Function should never be called");
+        });
+        fn.memo.foo = ["bar"];
+        fn("foo", function(val) {
+            expect(val).to.equal("bar");
+            done();
+        });
+    });
+
+    it('avoid constructor key return undefined', function(done) {
+        var fn = async.memoize(function(name, callback) {
+            setTimeout(function(){
+                callback(null, name);
+            }, 100);
+        });
+        fn('constructor', function(error, results) {
+            expect(results).to.equal('constructor');
+            done();
+        });
+    });
+
+    it('avoid __proto__ key return undefined', function(done) {
+        // Skip test if there is a Object.create bug (node 0.10 and some Chrome 30x versions)
+        var x = Object.create(null);
+        /* jshint proto: true */
+        x.__proto__ = 'foo';
+        if (x.__proto__ !== 'foo') {
+            return done();
+        }
+
+        var fn = async.memoize(function(name, callback) {
+            setTimeout(function(){
+                callback(null, name);
+            }, 100);
+        });
+        fn('__proto__', function(error, results) {
+            expect(results).to.equal('__proto__');
+            done();
+        });
+    });
+
+    it('allow hasOwnProperty as key', function(done) {
+        var fn = async.memoize(function(name, callback) {
+            setTimeout(function(){
+                callback(null, name);
+            }, 100);
+        });
+        fn('hasOwnProperty', function(error, results) {
+            expect(results).to.equal('hasOwnProperty');
+            done();
+        });
+    });
+});
diff --git a/mocha_test/parallel.js b/mocha_test/parallel.js
new file mode 100644
index 0000000..5362491
--- /dev/null
+++ b/mocha_test/parallel.js
@@ -0,0 +1,277 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+var isBrowser = require('./support/is_browser');
+var getFunctionsObject = require('./support/get_function_object');
+
+describe('parallel', function() {
+
+    it('parallel', function(done) {
+        var call_order = [];
+        async.parallel([
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(1);
+                    callback(null, 1);
+                }, 50);
+            },
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(2);
+                    callback(null, 2);
+                }, 100);
+            },
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(3);
+                    callback(null, 3,3);
+                }, 25);
+            }
+        ],
+        function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(call_order).to.eql([3,1,2]);
+            expect(results).to.eql([1,2,[3,3]]);
+            done();
+        });
+    });
+
+    it('parallel empty array', function(done) {
+        async.parallel([], function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([]);
+            done();
+        });
+    });
+
+    it('parallel error', function(done) {
+        async.parallel([
+            function(callback){
+                callback('error', 1);
+            },
+            function(callback){
+                callback('error2', 2);
+            }
+        ],
+        function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 100);
+    });
+
+    it('parallel no callback', function(done) {
+        async.parallel([
+            function(callback){callback();},
+            function(callback){callback(); done();},
+        ]);
+    });
+
+    it('parallel object', function(done) {
+        var call_order = [];
+        async.parallel(getFunctionsObject(call_order), function(err, results){
+            expect(err).to.equal(null);
+            expect(call_order).to.eql([3,1,2]);
+            expect(results).to.eql({
+                one: 1,
+                two: 2,
+                three: [3,3]
+            });
+            done();
+        });
+    });
+
+    // Issue 10 on github: https://github.com/caolan/async/issues#issue/10
+    it('paralel falsy return values', function(done) {
+        function taskFalse(callback) {
+            async.nextTick(function() {
+                callback(null, false);
+            });
+        }
+        function taskUndefined(callback) {
+            async.nextTick(function() {
+                callback(null, undefined);
+            });
+        }
+        function taskEmpty(callback) {
+            async.nextTick(function() {
+                callback(null);
+            });
+        }
+        function taskNull(callback) {
+            async.nextTick(function() {
+                callback(null, null);
+            });
+        }
+        async.parallel(
+            [taskFalse, taskUndefined, taskEmpty, taskNull],
+            function(err, results) {
+                expect(results.length).to.equal(4);
+                assert.strictEqual(results[0], false);
+                assert.strictEqual(results[1], undefined);
+                assert.strictEqual(results[2], undefined);
+                assert.strictEqual(results[3], null);
+                done();
+            }
+        );
+    });
+
+
+    it('parallel limit', function(done) {
+        var call_order = [];
+        async.parallelLimit([
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(1);
+                    callback(null, 1);
+                }, 50);
+            },
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(2);
+                    callback(null, 2);
+                }, 100);
+            },
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(3);
+                    callback(null, 3,3);
+                }, 25);
+            }
+        ],
+        2,
+        function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(call_order).to.eql([1,3,2]);
+            expect(results).to.eql([1,2,[3,3]]);
+            done();
+        });
+    });
+
+    it('parallel limit empty array', function(done) {
+        async.parallelLimit([], 2, function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([]);
+            done();
+        });
+    });
+
+    it('parallel limit error', function(done) {
+        async.parallelLimit([
+            function(callback){
+                callback('error', 1);
+            },
+            function(callback){
+                callback('error2', 2);
+            }
+        ],
+        1,
+        function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 100);
+    });
+
+    it('parallel limit no callback', function(done) {
+        async.parallelLimit([
+            function(callback){callback();},
+            function(callback){callback(); done();},
+        ], 1);
+    });
+
+    it('parallel limit object', function(done) {
+        var call_order = [];
+        async.parallelLimit(getFunctionsObject(call_order), 2, function(err, results){
+            expect(err).to.equal(null);
+            expect(call_order).to.eql([1,3,2]);
+            expect(results).to.eql({
+                one: 1,
+                two: 2,
+                three: [3,3]
+            });
+            done();
+        });
+    });
+
+    it('parallel call in another context', function(done) {
+        if (isBrowser()) {
+            // node only test
+            done();
+            return;
+        }
+        var vm = require('vm');
+        var sandbox = {
+            async: async,
+            done: done
+        };
+
+        var fn = "(" + (function () {
+            async.parallel([function (callback) {
+                callback();
+            }], function (err) {
+                if (err) {
+                    return done(err);
+                }
+                done();
+            });
+        }).toString() + "())";
+
+        vm.runInNewContext(fn, sandbox);
+    });
+
+    it('parallel error with reflect', function(done) {
+        async.parallel([
+            async.reflect(function(callback){
+                callback('error', 1);
+            }),
+            async.reflect(function(callback){
+                callback('error2', 2);
+            }),
+            async.reflect(function(callback){
+                callback(null, 2);
+            })
+        ],
+        function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([
+                { error: 'error' },
+                { error: 'error2' },
+                { value: 2 }
+            ]);
+            done();
+        });
+    });
+
+    it('parallel does not continue replenishing after error', function(done) {
+        var started = 0;
+        var arr = [
+            funcToCall,
+            funcToCall,
+            funcToCall,
+            funcToCall,
+            funcToCall,
+            funcToCall,
+            funcToCall,
+            funcToCall,
+            funcToCall,
+        ];
+        var delay = 10;
+        var limit = 3;
+        var maxTime = 10 * arr.length;
+        function funcToCall(callback) {
+            started ++;
+            if (started === 3) {
+                return callback(new Error ("Test Error"));
+            }
+            setTimeout(function(){
+                callback();
+            }, delay);
+        }
+
+        async.parallelLimit(arr, limit, function(){});
+
+        setTimeout(function(){
+            expect(started).to.equal(3);
+            done();
+        }, maxTime);
+    });
+});
diff --git a/mocha_test/priorityQueue.js b/mocha_test/priorityQueue.js
index fa5cfce..b777815 100644
--- a/mocha_test/priorityQueue.js
+++ b/mocha_test/priorityQueue.js
@@ -108,7 +108,43 @@ describe('priorityQueue', function() {
         };
     });
 
-
+    context('q.saturated(): ', function() {
+        it('should call the saturated callback if tasks length is concurrency', function(done) {
+            var calls = [];
+            var q = async.priorityQueue(function(task, cb) {
+                calls.push('process ' + task);
+                async.setImmediate(cb);
+            }, 4);
+            q.saturated = function() {
+                calls.push('saturated');
+            };
+            q.empty = function() {
+                expect(calls.indexOf('saturated')).to.be.above(-1);
+                setTimeout(function() {
+                    expect(calls).eql([
+                        'process foo4',
+                        'process foo3',
+                        'process foo2',
+                        "saturated",
+                        'process foo1',
+                        'foo4 cb',
+                        "saturated",
+                        'process foo0',
+                        'foo3 cb',
+                        'foo2 cb',
+                        'foo1 cb',
+                        'foo0 cb'
+                    ]);
+                    done();
+                }, 50);
+            };
+            q.push('foo0', 5, function () {calls.push('foo0 cb');});
+            q.push('foo1', 4, function () {calls.push('foo1 cb');});
+            q.push('foo2', 3, function () {calls.push('foo2 cb');});
+            q.push('foo3', 2, function () {calls.push('foo3 cb');});
+            q.push('foo4', 1, function () {calls.push('foo4 cb');});
+        });
+    });
 
     context('q.unsaturated(): ',function() {
         it('should have a default buffer property that equals 25% of the concurrenct rate', function(done) {
@@ -148,9 +184,6 @@ describe('priorityQueue', function() {
                 expect(calls.indexOf('unsaturated')).to.be.above(-1);
                 setTimeout(function() {
                     expect(calls).eql([
-                        'unsaturated',
-                        'unsaturated',
-                        'unsaturated',
                         'process foo4',
                         'process foo3',
                         'process foo2',
diff --git a/mocha_test/queue.js b/mocha_test/queue.js
index 2baf124..a51efb3 100644
--- a/mocha_test/queue.js
+++ b/mocha_test/queue.js
@@ -599,7 +599,43 @@ describe('queue', function(){
         done();
     });
 
-
+    context('q.saturated(): ', function() {
+        it('should call the saturated callback if tasks length is concurrency', function(done) {
+            var calls = [];
+            var q = async.queue(function(task, cb) {
+                calls.push('process ' + task);
+                async.setImmediate(cb);
+            }, 4);
+            q.saturated = function() {
+                calls.push('saturated');
+            };
+            q.empty = function() {
+                expect(calls.indexOf('saturated')).to.be.above(-1);
+                setTimeout(function() {
+                    expect(calls).eql([
+                        'process foo0',
+                        'process foo1',
+                        'process foo2',
+                        "saturated",
+                        'process foo3',
+                        'foo0 cb',
+                        "saturated",
+                        'process foo4',
+                        'foo1 cb',
+                        'foo2 cb',
+                        'foo3 cb',
+                        'foo4 cb'
+                    ]);
+                    done();
+                }, 50);
+            };
+            q.push('foo0', function () {calls.push('foo0 cb');});
+            q.push('foo1', function () {calls.push('foo1 cb');});
+            q.push('foo2', function () {calls.push('foo2 cb');});
+            q.push('foo3', function () {calls.push('foo3 cb');});
+            q.push('foo4', function () {calls.push('foo4 cb');});
+        });
+    });
 
     context('q.unsaturated(): ',function() {
         it('should have a default buffer property that equals 25% of the concurrenct rate', function(done){
diff --git a/mocha_test/reduce.js b/mocha_test/reduce.js
new file mode 100644
index 0000000..f5dce59
--- /dev/null
+++ b/mocha_test/reduce.js
@@ -0,0 +1,66 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('reduce', function() {
+
+    it('reduce', function(done) {
+        var call_order = [];
+        async.reduce([1,2,3], 0, function(a, x, callback){
+            call_order.push(x);
+            callback(null, a + x);
+        }, function(err, result){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(result).to.equal(6);
+            expect(call_order).to.eql([1,2,3]);
+            done();
+        });
+    });
+
+    it('reduce async with non-reference memo', function(done) {
+        async.reduce([1,3,2], 0, function(a, x, callback){
+            setTimeout(function(){callback(null, a + x);}, Math.random()*100);
+        }, function(err, result){
+            expect(result).to.equal(6);
+            done();
+        });
+    });
+
+    it('reduce error', function(done) {
+        async.reduce([1,2,3], 0, function(a, x, callback){
+            callback('error');
+        }, function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('inject alias', function(done) {
+        expect(async.inject).to.equal(async.reduce);
+        done();
+    });
+
+    it('foldl alias', function(done) {
+        expect(async.foldl).to.equal(async.reduce);
+        done();
+    });
+
+    it('reduceRight', function(done) {
+        var call_order = [];
+        var a = [1,2,3];
+        async.reduceRight(a, 0, function(a, x, callback){
+            call_order.push(x);
+            callback(null, a + x);
+        }, function(err, result){
+            expect(result).to.equal(6);
+            expect(call_order).to.eql([3,2,1]);
+            expect(a).to.eql([1,2,3]);
+            done();
+        });
+    });
+
+    it('foldr alias', function(done) {
+        expect(async.foldr).to.equal(async.reduceRight);
+        done();
+    });
+});
diff --git a/mocha_test/seq.js b/mocha_test/seq.js
new file mode 100644
index 0000000..1f7cbfc
--- /dev/null
+++ b/mocha_test/seq.js
@@ -0,0 +1,109 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('seq', function() {
+
+    it('seq', function(done) {
+        var add2 = function (n, cb) {
+            expect(n).to.equal(3);
+            setTimeout(function () {
+                cb(null, n + 2);
+            }, 50);
+        };
+        var mul3 = function (n, cb) {
+            expect(n).to.equal(5);
+            setTimeout(function () {
+                cb(null, n * 3);
+            }, 15);
+        };
+        var add1 = function (n, cb) {
+            expect(n).to.equal(15);
+            setTimeout(function () {
+                cb(null, n + 1);
+            }, 100);
+        };
+        var add2mul3add1 = async.seq(add2, mul3, add1);
+        add2mul3add1(3, function (err, result) {
+            if (err) {
+                return done(err);
+            }
+            assert(err === null, err + " passed instead of 'null'");
+            expect(result).to.equal(16);
+            done();
+        });
+    });
+
+    it('seq error', function(done) {
+        var testerr = new Error('test');
+
+        var add2 = function (n, cb) {
+            expect(n).to.equal(3);
+            setTimeout(function () {
+                cb(null, n + 2);
+            }, 50);
+        };
+        var mul3 = function (n, cb) {
+            expect(n).to.equal(5);
+            setTimeout(function () {
+                cb(testerr);
+            }, 15);
+        };
+        var add1 = function (n, cb) {
+            assert(false, 'add1 should not get called');
+            setTimeout(function () {
+                cb(null, n + 1);
+            }, 100);
+        };
+        var add2mul3add1 = async.seq(add2, mul3, add1);
+        add2mul3add1(3, function (err) {
+            expect(err).to.equal(testerr);
+            done();
+        });
+    });
+
+    it('seq binding', function(done) {
+        var testcontext = {name: 'foo'};
+
+        var add2 = function (n, cb) {
+            expect(this).to.equal(testcontext);
+            setTimeout(function () {
+                cb(null, n + 2);
+            }, 50);
+        };
+        var mul3 = function (n, cb) {
+            expect(this).to.equal(testcontext);
+            setTimeout(function () {
+                cb(null, n * 3);
+            }, 15);
+        };
+        var add2mul3 = async.seq(add2, mul3);
+        add2mul3.call(testcontext, 3, function (err, result) {
+            if (err) {
+                return done(err);
+            }
+            expect(this).to.equal(testcontext);
+            expect(result).to.equal(15);
+            done();
+        });
+    });
+
+    it('seq without callback', function(done) {
+        var testcontext = {name: 'foo'};
+
+        var add2 = function (n, cb) {
+            expect(this).to.equal(testcontext);
+            setTimeout(function () {
+                cb(null, n + 2);
+            }, 50);
+        };
+        var mul3 = function () {
+            expect(this).to.equal(testcontext);
+            setTimeout(function () {
+                done();
+            }, 15);
+        };
+        var add2mul3 = async.seq(add2, mul3);
+        add2mul3.call(testcontext, 3);
+    });
+});
diff --git a/mocha_test/series.js b/mocha_test/series.js
new file mode 100644
index 0000000..0237582
--- /dev/null
+++ b/mocha_test/series.js
@@ -0,0 +1,200 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+var isBrowser = require('./support/is_browser');
+var getFunctionsObject = require('./support/get_function_object');
+
+describe('series', function() {
+    it('series', function(done) {
+        var call_order = [];
+        async.series([
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(1);
+                    callback(null, 1);
+                }, 25);
+            },
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(2);
+                    callback(null, 2);
+                }, 50);
+            },
+            function(callback){
+                setTimeout(function(){
+                    call_order.push(3);
+                    callback(null, 3,3);
+                }, 15);
+            }
+        ],
+        function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([1,2,[3,3]]);
+            expect(call_order).to.eql([1,2,3]);
+            done();
+        });
+    });
+
+    it('with reflect', function(done) {
+        var call_order = [];
+        async.series([
+            async.reflect(function(callback){
+                setTimeout(function(){
+                    call_order.push(1);
+                    callback(null, 1);
+                }, 25);
+            }),
+            async.reflect(function(callback){
+                setTimeout(function(){
+                    call_order.push(2);
+                    callback(null, 2);
+                }, 50);
+            }),
+            async.reflect(function(callback){
+                setTimeout(function(){
+                    call_order.push(3);
+                    callback(null, 3,3);
+                }, 15);
+            })
+        ],
+        function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([
+                { value: 1 },
+                { value: 2 },
+                { value: [3,3] }
+            ]);
+            expect(call_order).to.eql([1,2,3]);
+            done();
+        });
+    });
+
+    it('empty array', function(done) {
+        async.series([], function(err, results){
+            expect(err).to.equal(null);
+            expect(results).to.eql([]);
+            done();
+        });
+    });
+
+    it('error', function(done) {
+        async.series([
+            function(callback){
+                callback('error', 1);
+            },
+            function(callback){
+                assert(false, 'should not be called');
+                callback('error2', 2);
+            }
+        ],
+        function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 100);
+    });
+
+    it('error with reflect', function(done) {
+        async.series([
+            async.reflect(function(callback){
+                callback('error', 1);
+            }),
+            async.reflect(function(callback){
+                callback('error2', 2);
+            }),
+            async.reflect(function(callback){
+                callback(null, 1);
+            })
+        ],
+        function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([
+                { error: 'error' },
+                { error: 'error2' },
+                { value: 1 }
+            ]);
+            done();
+        });
+    });
+
+    it('no callback', function(done) {
+        async.series([
+            function(callback){callback();},
+            function(callback){callback(); done();},
+        ]);
+    });
+
+    it('object', function(done) {
+        var call_order = [];
+        async.series(getFunctionsObject(call_order), function(err, results){
+            expect(err).to.equal(null);
+            expect(results).to.eql({
+                one: 1,
+                two: 2,
+                three: [3,3]
+            });
+            expect(call_order).to.eql([1,2,3]);
+            done();
+        });
+    });
+
+    it('call in another context', function(done) {
+        if (isBrowser()) {
+            // node only test
+            done();
+            return;
+        }
+        var vm = require('vm');
+        var sandbox = {
+            async: async,
+            done: done
+        };
+
+        var fn = "(" + (function () {
+            async.series([function (callback) {
+                callback();
+            }], function (err) {
+                if (err) {
+                    return done(err);
+                }
+                done();
+            });
+        }).toString() + "())";
+
+        vm.runInNewContext(fn, sandbox);
+    });
+
+    // Issue 10 on github: https://github.com/caolan/async/issues#issue/10
+    it('falsy return values', function(done) {
+        function taskFalse(callback) {
+            async.nextTick(function() {
+                callback(null, false);
+            });
+        }
+        function taskUndefined(callback) {
+            async.nextTick(function() {
+                callback(null, undefined);
+            });
+        }
+        function taskEmpty(callback) {
+            async.nextTick(function() {
+                callback(null);
+            });
+        }
+        function taskNull(callback) {
+            async.nextTick(function() {
+                callback(null, null);
+            });
+        }
+        async.series(
+            [taskFalse, taskUndefined, taskEmpty, taskNull],
+            function(err, results) {
+                expect(results.length).to.equal(4);
+                assert.strictEqual(results[0], false);
+                assert.strictEqual(results[1], undefined);
+                assert.strictEqual(results[2], undefined);
+                assert.strictEqual(results[3], null);
+                done();
+            }
+        );
+    });
+});
diff --git a/mocha_test/sortBy.js b/mocha_test/sortBy.js
new file mode 100644
index 0000000..1636276
--- /dev/null
+++ b/mocha_test/sortBy.js
@@ -0,0 +1,36 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('sortBy', function(){
+    it('sortBy', function(done) {
+        async.sortBy([{a:1},{a:15},{a:6}], function(x, callback){
+            setTimeout(function(){callback(null, x.a);}, 0);
+        }, function(err, result){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(result).to.eql([{a:1},{a:6},{a:15}]);
+            done();
+        });
+    });
+
+    it('sortBy inverted', function(done) {
+        async.sortBy([{a:1},{a:15},{a:6}], function(x, callback){
+            setTimeout(function(){callback(null, x.a*-1);}, 0);
+        }, function(err, result){
+            expect(result).to.eql([{a:15},{a:6},{a:1}]);
+            done();
+        });
+    });
+
+    it('sortBy error', function(done) {
+        var error = new Error('asdas');
+        async.sortBy([{a:1},{a:15},{a:6}], function(x, callback){
+            async.setImmediate(function(){
+                callback(error);
+            });
+        }, function(err){
+            expect(err).to.equal(error);
+            done();
+        });
+    });
+});
diff --git a/mocha_test/support/get_function_object.js b/mocha_test/support/get_function_object.js
new file mode 100644
index 0000000..008fd8f
--- /dev/null
+++ b/mocha_test/support/get_function_object.js
@@ -0,0 +1,22 @@
+module.exports = function (call_order) {
+    return {
+        one: function(callback) {
+            setTimeout(function() {
+                call_order.push(1);
+                callback(null, 1);
+            }, 125);
+        },
+        two: function(callback) {
+            setTimeout(function() {
+                call_order.push(2);
+                callback(null, 2);
+            }, 200);
+        },
+        three: function(callback) {
+            setTimeout(function() {
+                call_order.push(3);
+                callback(null, 3, 3);
+            }, 50);
+        }
+    };
+};
diff --git a/mocha_test/timeout.js b/mocha_test/timeout.js
index 7608124..be41283 100644
--- a/mocha_test/timeout.js
+++ b/mocha_test/timeout.js
@@ -19,6 +19,30 @@ describe('timeout', function () {
         function(err, results) {
             expect(err.message).to.equal('Callback function "asyncFn" timed out.');
             expect(err.code).to.equal('ETIMEDOUT');
+            expect(err.info).to.equal(undefined);
+            expect(results[0]).to.equal('I didn\'t time out');
+            done();
+        });
+    });
+
+    it('timeout with series and info', function (done) {
+        var info = { custom: 'info about callback' };
+        async.series([
+            async.timeout(function asyncFn(callback) {
+                setTimeout(function() {
+                    callback(null, 'I didn\'t time out');
+                }, 25);
+            }, 50),
+            async.timeout(function asyncFn(callback) {
+                setTimeout(function() {
+                    callback(null, 'I will time out');
+                }, 75);
+            }, 50, info)
+        ],
+        function(err, results) {
+            expect(err.message).to.equal('Callback function "asyncFn" timed out.');
+            expect(err.code).to.equal('ETIMEDOUT');
+            expect(err.info).to.equal(info);
             expect(results[0]).to.equal('I didn\'t time out');
             done();
         });
@@ -40,9 +64,9 @@ describe('timeout', function () {
         function(err, results) {
             expect(err.message).to.equal('Callback function "asyncFn" timed out.');
             expect(err.code).to.equal('ETIMEDOUT');
+            expect(err.info).to.equal(undefined);
             expect(results[0]).to.equal('I didn\'t time out');
             done();
         });
     });
-
 });
diff --git a/mocha_test/times.js b/mocha_test/times.js
new file mode 100644
index 0000000..ad1dfcd
--- /dev/null
+++ b/mocha_test/times.js
@@ -0,0 +1,90 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('times', function() {
+
+    it('times', function(done) {
+        async.times(5, function(n, next) {
+            next(null, n);
+        }, function(err, results) {
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([0,1,2,3,4]);
+            done();
+        });
+    });
+
+    it('times 3', function(done) {
+        var args = [];
+        async.times(3, function(n, callback){
+            setTimeout(function(){
+                args.push(n);
+                callback();
+            }, n * 25);
+        }, function(err){
+            if (err) throw err;
+            expect(args).to.eql([0,1,2]);
+            done();
+        });
+    });
+
+    it('times 0', function(done) {
+        async.times(0, function(n, callback){
+            assert(false, 'iteratee should not be called');
+            callback();
+        }, function(err){
+            if (err) throw err;
+            assert(true, 'should call callback');
+        });
+        setTimeout(done, 25);
+    });
+
+    it('times error', function(done) {
+        async.times(3, function(n, callback){
+            callback('error');
+        }, function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('timesSeries', function(done) {
+        var call_order = [];
+        async.timesSeries(5, function(n, callback){
+            setTimeout(function(){
+                call_order.push(n);
+                callback(null, n);
+            }, 100 - n * 10);
+        }, function(err, results){
+            expect(call_order).to.eql([0,1,2,3,4]);
+            expect(results).to.eql([0,1,2,3,4]);
+            done();
+        });
+    });
+
+    it('timesSeries error', function(done) {
+        async.timesSeries(5, function(n, callback){
+            callback('error');
+        }, function(err){
+            expect(err).to.equal('error');
+        });
+        setTimeout(done, 50);
+    });
+
+    it('timesLimit', function(done) {
+        var limit = 2;
+        var running = 0;
+        async.timesLimit(5, limit, function (i, next) {
+            running++;
+            assert(running <= limit && running > 0, running);
+            setTimeout(function () {
+                running--;
+                next(null, i * 2);
+            }, (3 - i) * 10);
+        }, function(err, results){
+            assert(err === null, err + " passed instead of 'null'");
+            expect(results).to.eql([0, 2, 4, 6, 8]);
+            done();
+        });
+    });
+});
diff --git a/mocha_test/transform.js b/mocha_test/transform.js
new file mode 100644
index 0000000..5c04f56
--- /dev/null
+++ b/mocha_test/transform.js
@@ -0,0 +1,54 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+
+describe('transform', function() {
+
+    it('transform implictly determines memo if not provided', function(done) {
+        async.transform([1,2,3], function(memo, x, v, callback){
+            memo.push(x + 1);
+            callback();
+        }, function(err, result){
+            expect(result).to.eql([2, 3, 4]);
+            done();
+        });
+    });
+
+    it('transform async with object memo', function(done) {
+        async.transform([1,3,2], {}, function(memo, v, k, callback){
+            setTimeout(function() {
+                memo[k] = v;
+                callback();
+            });
+        }, function(err, result) {
+            expect(err).to.equal(null);
+            expect(result).to.eql({
+                0: 1,
+                1: 3,
+                2: 2
+            });
+            done();
+        });
+    });
+
+    it('transform iterating object', function(done) {
+        async.transform({a: 1, b: 3, c: 2}, function(memo, v, k, callback){
+            setTimeout(function() {
+                memo[k] = v + 1;
+                callback();
+            });
+        }, function(err, result) {
+            expect(err).to.equal(null);
+            expect(result).to.eql({a: 2, b: 4, c: 3});
+            done();
+        });
+    });
+
+    it('transform error', function(done) {
+        async.transform([1,2,3], function(a, v, k, callback){
+            callback('error');
+        }, function(err){
+            expect(err).to.equal('error');
+            done();
+        });
+    });
+});
diff --git a/mocha_test/until.js b/mocha_test/until.js
new file mode 100644
index 0000000..a738218
--- /dev/null
+++ b/mocha_test/until.js
@@ -0,0 +1,93 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('until', function(){
+    it('until', function(done) {
+        var call_order = [];
+        var count = 0;
+        async.until(
+            function () {
+                call_order.push(['test', count]);
+                return (count == 5);
+            },
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb(null, count);
+            },
+            function (err, result) {
+                assert(err === null, err + " passed instead of 'null'");
+                expect(result).to.equal(5, 'last result passed through');
+                expect(call_order).to.eql([
+                    ['test', 0],
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5],
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+
+    it('doUntil', function(done) {
+        var call_order = [];
+        var count = 0;
+        async.doUntil(
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb(null, count);
+            },
+            function () {
+                call_order.push(['test', count]);
+                return (count == 5);
+            },
+            function (err, result) {
+                assert(err === null, err + " passed instead of 'null'");
+                expect(result).to.equal(5, 'last result passed through');
+                expect(call_order).to.eql([
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5]
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+
+    it('doUntil callback params', function(done) {
+        var call_order = [];
+        var count = 0;
+        async.doUntil(
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb(null, count);
+            },
+            function (c) {
+                call_order.push(['test', c]);
+                return (c == 5);
+            },
+            function (err, result) {
+                if (err) throw err;
+                expect(result).to.equal(5, 'last result passed through');
+                expect(call_order).to.eql([
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5]
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+});
diff --git a/mocha_test/waterfall.js b/mocha_test/waterfall.js
index b1d1561..7053b2c 100644
--- a/mocha_test/waterfall.js
+++ b/mocha_test/waterfall.js
@@ -1,5 +1,6 @@
 var async = require('../lib');
 var expect = require('chai').expect;
+var assert = require('assert');
 
 describe("waterfall", function () {
 
@@ -80,7 +81,7 @@ describe("waterfall", function () {
                 callback('error');
             },
             function(callback){
-                test.ok(false, 'next function should not be called');
+                assert(false, 'next function should not be called');
                 callback();
             }
         ], function(err){
diff --git a/mocha_test/whilst.js b/mocha_test/whilst.js
new file mode 100644
index 0000000..a384916
--- /dev/null
+++ b/mocha_test/whilst.js
@@ -0,0 +1,123 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+var assert = require('assert');
+
+describe('whilst', function(){
+    it('whilst', function(done) {
+        var call_order = [];
+
+        var count = 0;
+        async.whilst(
+            function () {
+                call_order.push(['test', count]);
+                return (count < 5);
+            },
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb(null, count);
+            },
+            function (err, result) {
+                assert(err === null, err + " passed instead of 'null'");
+                expect(result).to.equal(5, 'last result passed through');
+                expect(call_order).to.eql([
+                    ['test', 0],
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5],
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+
+    it('whilst optional callback', function(done) {
+        var counter = 0;
+        async.whilst(
+            function () { return counter < 2; },
+            function (cb) {
+                counter++;
+                cb();
+            }
+        );
+        expect(counter).to.equal(2);
+        done();
+    });
+
+    it('doWhilst', function(done) {
+        var call_order = [];
+
+        var count = 0;
+        async.doWhilst(
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb(null, count);
+            },
+            function () {
+                call_order.push(['test', count]);
+                return (count < 5);
+            },
+            function (err, result) {
+                assert(err === null, err + " passed instead of 'null'");
+                expect(result).to.equal(5, 'last result passed through');
+                expect(call_order).to.eql([
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5]
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+
+    it('doWhilst callback params', function(done) {
+        var call_order = [];
+        var count = 0;
+        async.doWhilst(
+            function (cb) {
+                call_order.push(['iteratee', count]);
+                count++;
+                cb(null, count);
+            },
+            function (c) {
+                call_order.push(['test', c]);
+                return (c < 5);
+            },
+            function (err, result) {
+                if (err) throw err;
+                expect(result).to.equal(5, 'last result passed through');
+                expect(call_order).to.eql([
+                    ['iteratee', 0], ['test', 1],
+                    ['iteratee', 1], ['test', 2],
+                    ['iteratee', 2], ['test', 3],
+                    ['iteratee', 3], ['test', 4],
+                    ['iteratee', 4], ['test', 5]
+                ]);
+                expect(count).to.equal(5);
+                done();
+            }
+        );
+    });
+
+    it('doWhilst - error', function(done) {
+        var error = new Error('asdas');
+
+        async.doWhilst(
+            function (cb) {
+                cb(error);
+            },
+            function () {},
+            function (err) {
+                expect(err).to.equal(error);
+                done();
+            }
+        );
+    });
+});
diff --git a/package.json b/package.json
index 6c8eb02..ae8cbcd 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "async",
   "description": "Higher-order functions and common patterns for asynchronous code",
-  "version": "2.0.0-rc.3",
+  "version": "2.0.0-rc.4",
   "main": "dist/async.js",
   "author": "Caolan McMahon",
   "repository": {
@@ -44,7 +44,6 @@
     "karma-mocha-reporter": "^1.0.2",
     "mocha": "^2.2.5",
     "native-promise-only": "^0.8.0-a",
-    "nodeunit": ">0.0.0",
     "nyc": "^2.1.0",
     "recursive-readdir": "^1.3.0",
     "rimraf": "^2.5.0",
@@ -59,12 +58,11 @@
   "scripts": {
     "coverage": "nyc npm test && nyc report",
     "coveralls": "nyc npm test && nyc report --reporter=text-lcov | coveralls",
-    "lint": "jshint lib/ test/ mocha_test/ perf/memory.js perf/suites.js perf/benchmark.js support/ karma.conf.js && jscs lib/ test/ mocha_test/ perf/memory.js perf/suites.js perf/benchmark.js support/ karma.conf.js",
+    "lint": "jshint lib/ mocha_test/ perf/memory.js perf/suites.js perf/benchmark.js support/ karma.conf.js && jscs lib/ mocha_test/ perf/memory.js perf/suites.js perf/benchmark.js support/ karma.conf.js",
     "mocha-browser-test": "karma start",
     "mocha-node-test": "mocha mocha_test/ --compilers js:babel-core/register",
     "mocha-test": "npm run mocha-node-test && npm run mocha-browser-test",
-    "nodeunit-test": "nodeunit test/test-async.js",
-    "test": "npm run-script lint && npm run nodeunit-test && npm run mocha-node-test"
+    "test": "npm run-script lint && npm run mocha-node-test"
   },
   "license": "MIT",
   "jam": {
diff --git a/support/xyz.sh b/support/xyz.sh
index e178eee..cb92577 100755
--- a/support/xyz.sh
+++ b/support/xyz.sh
@@ -167,5 +167,4 @@ run "git commit --message '$message'"
 run "git tag --annotate '$tag' --message '$message'"
 run "git push '$repo' 'refs/heads/$branch' 'refs/tags/$tag'"
 
-#cd build/
-#run "npm pack"
+# npm publish is managed by the Makefile
diff --git a/test/test-async.js b/test/test-async.js
deleted file mode 100755
index b310f70..0000000
--- a/test/test-async.js
+++ /dev/null
@@ -1,2751 +0,0 @@
-/**
- * NOTE:  We are in the process of migrating these tests to Mocha.  If you are
- * adding a new test, please create a new spec file in mocha_tests/
- */
-
-require('babel-core/register');
-var async = require('../lib');
-
-if (!Function.prototype.bind) {
-    Function.prototype.bind = function (thisArg) {
-        var args = Array.prototype.slice.call(arguments, 1);
-        var self = this;
-        return function () {
-            self.apply(thisArg, args.concat(Array.prototype.slice.call(arguments)));
-        };
-    };
-}
-
-function eachIteratee(args, x, callback) {
-    setTimeout(function(){
-        args.push(x);
-        callback();
-    }, x*25);
-}
-
-function forEachOfIteratee(args, value, key, callback) {
-    setTimeout(function(){
-        args.push(key, value);
-        callback();
-    }, value*25);
-}
-
-function mapIteratee(call_order, x, callback) {
-    setTimeout(function(){
-        call_order.push(x);
-        callback(null, x*2);
-    }, x*25);
-}
-
-function eachNoCallbackIteratee(test, x, callback) {
-    test.equal(x, 1);
-    callback();
-    test.done();
-}
-
-function forEachOfNoCallbackIteratee(test, x, key, callback) {
-    test.equal(x, 1);
-    test.equal(key, "a");
-    callback();
-    test.done();
-}
-
-function getFunctionsObject(call_order) {
-    return {
-        one: function(callback){
-            setTimeout(function(){
-                call_order.push(1);
-                callback(null, 1);
-            }, 125);
-        },
-        two: function(callback){
-            setTimeout(function(){
-                call_order.push(2);
-                callback(null, 2);
-            }, 200);
-        },
-        three: function(callback){
-            setTimeout(function(){
-                call_order.push(3);
-                callback(null, 3,3);
-            }, 50);
-        }
-    };
-}
-
-function isBrowser() {
-    return (typeof process === "undefined") ||
-        (process + "" !== "[object process]"); // browserify
-}
-
-
-exports['seq'] = function (test) {
-    test.expect(5);
-    var add2 = function (n, cb) {
-        test.equal(n, 3);
-        setTimeout(function () {
-            cb(null, n + 2);
-        }, 50);
-    };
-    var mul3 = function (n, cb) {
-        test.equal(n, 5);
-        setTimeout(function () {
-            cb(null, n * 3);
-        }, 15);
-    };
-    var add1 = function (n, cb) {
-        test.equal(n, 15);
-        setTimeout(function () {
-            cb(null, n + 1);
-        }, 100);
-    };
-    var add2mul3add1 = async.seq(add2, mul3, add1);
-    add2mul3add1(3, function (err, result) {
-        if (err) {
-            return test.done(err);
-        }
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.equal(result, 16);
-        test.done();
-    });
-};
-
-exports['seq error'] = function (test) {
-    test.expect(3);
-    var testerr = new Error('test');
-
-    var add2 = function (n, cb) {
-        test.equal(n, 3);
-        setTimeout(function () {
-            cb(null, n + 2);
-        }, 50);
-    };
-    var mul3 = function (n, cb) {
-        test.equal(n, 5);
-        setTimeout(function () {
-            cb(testerr);
-        }, 15);
-    };
-    var add1 = function (n, cb) {
-        test.ok(false, 'add1 should not get called');
-        setTimeout(function () {
-            cb(null, n + 1);
-        }, 100);
-    };
-    var add2mul3add1 = async.seq(add2, mul3, add1);
-    add2mul3add1(3, function (err) {
-        test.equal(err, testerr);
-        test.done();
-    });
-};
-
-exports['seq binding'] = function (test) {
-    test.expect(4);
-    var testcontext = {name: 'foo'};
-
-    var add2 = function (n, cb) {
-        test.equal(this, testcontext);
-        setTimeout(function () {
-            cb(null, n + 2);
-        }, 50);
-    };
-    var mul3 = function (n, cb) {
-        test.equal(this, testcontext);
-        setTimeout(function () {
-            cb(null, n * 3);
-        }, 15);
-    };
-    var add2mul3 = async.seq(add2, mul3);
-    add2mul3.call(testcontext, 3, function (err, result) {
-        if (err) {
-            return test.done(err);
-        }
-        test.equal(this, testcontext);
-        test.equal(result, 15);
-        test.done();
-    });
-};
-
-exports['seq without callback'] = function (test) {
-    test.expect(2);
-    var testcontext = {name: 'foo'};
-
-    var add2 = function (n, cb) {
-        test.equal(this, testcontext);
-        setTimeout(function () {
-            cb(null, n + 2);
-        }, 50);
-    };
-    var mul3 = function () {
-        test.equal(this, testcontext);
-        setTimeout(function () {
-            test.done();
-        }, 15);
-    };
-    var add2mul3 = async.seq(add2, mul3);
-    add2mul3.call(testcontext, 3);
-};
-
-
-exports['parallel'] = function(test){
-    var call_order = [];
-    async.parallel([
-        function(callback){
-            setTimeout(function(){
-                call_order.push(1);
-                callback(null, 1);
-            }, 50);
-        },
-        function(callback){
-            setTimeout(function(){
-                call_order.push(2);
-                callback(null, 2);
-            }, 100);
-        },
-        function(callback){
-            setTimeout(function(){
-                call_order.push(3);
-                callback(null, 3,3);
-            }, 25);
-        }
-    ],
-    function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(call_order, [3,1,2]);
-        test.same(results, [1,2,[3,3]]);
-        test.done();
-    });
-};
-
-exports['parallel empty array'] = function(test){
-    async.parallel([], function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(results, []);
-        test.done();
-    });
-};
-
-exports['parallel error'] = function(test){
-    async.parallel([
-        function(callback){
-            callback('error', 1);
-        },
-        function(callback){
-            callback('error2', 2);
-        }
-    ],
-    function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 100);
-};
-
-exports['parallel no callback'] = function(test){
-    async.parallel([
-        function(callback){callback();},
-        function(callback){callback(); test.done();},
-    ]);
-};
-
-exports['parallel object'] = function(test){
-    var call_order = [];
-    async.parallel(getFunctionsObject(call_order), function(err, results){
-        test.equals(err, null);
-        test.same(call_order, [3,1,2]);
-        test.same(results, {
-            one: 1,
-            two: 2,
-            three: [3,3]
-        });
-        test.done();
-    });
-};
-
-// Issue 10 on github: https://github.com/caolan/async/issues#issue/10
-exports['paralel falsy return values'] = function (test) {
-    function taskFalse(callback) {
-        async.nextTick(function() {
-            callback(null, false);
-        });
-    }
-    function taskUndefined(callback) {
-        async.nextTick(function() {
-            callback(null, undefined);
-        });
-    }
-    function taskEmpty(callback) {
-        async.nextTick(function() {
-            callback(null);
-        });
-    }
-    function taskNull(callback) {
-        async.nextTick(function() {
-            callback(null, null);
-        });
-    }
-    async.parallel(
-        [taskFalse, taskUndefined, taskEmpty, taskNull],
-        function(err, results) {
-            test.equal(results.length, 4);
-            test.strictEqual(results[0], false);
-            test.strictEqual(results[1], undefined);
-            test.strictEqual(results[2], undefined);
-            test.strictEqual(results[3], null);
-            test.done();
-        }
-    );
-};
-
-
-exports['parallel limit'] = function(test){
-    var call_order = [];
-    async.parallelLimit([
-        function(callback){
-            setTimeout(function(){
-                call_order.push(1);
-                callback(null, 1);
-            }, 50);
-        },
-        function(callback){
-            setTimeout(function(){
-                call_order.push(2);
-                callback(null, 2);
-            }, 100);
-        },
-        function(callback){
-            setTimeout(function(){
-                call_order.push(3);
-                callback(null, 3,3);
-            }, 25);
-        }
-    ],
-    2,
-    function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(call_order, [1,3,2]);
-        test.same(results, [1,2,[3,3]]);
-        test.done();
-    });
-};
-
-exports['parallel limit empty array'] = function(test){
-    async.parallelLimit([], 2, function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(results, []);
-        test.done();
-    });
-};
-
-exports['parallel limit error'] = function(test){
-    async.parallelLimit([
-        function(callback){
-            callback('error', 1);
-        },
-        function(callback){
-            callback('error2', 2);
-        }
-    ],
-    1,
-    function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 100);
-};
-
-exports['parallel limit no callback'] = function(test){
-    async.parallelLimit([
-        function(callback){callback();},
-        function(callback){callback(); test.done();},
-    ], 1);
-};
-
-exports['parallel limit object'] = function(test){
-    var call_order = [];
-    async.parallelLimit(getFunctionsObject(call_order), 2, function(err, results){
-        test.equals(err, null);
-        test.same(call_order, [1,3,2]);
-        test.same(results, {
-            one: 1,
-            two: 2,
-            three: [3,3]
-        });
-        test.done();
-    });
-};
-
-exports['parallel call in another context'] = function(test) {
-    if (isBrowser()) {
-        // node only test
-        test.done();
-        return;
-    }
-    var vm = require('vm');
-    var sandbox = {
-        async: async,
-        test: test
-    };
-
-    var fn = "(" + (function () {
-        async.parallel([function (callback) {
-            callback();
-        }], function (err) {
-            if (err) {
-                return test.done(err);
-            }
-            test.done();
-        });
-    }).toString() + "())";
-
-    vm.runInNewContext(fn, sandbox);
-};
-
-exports['parallel error with reflect'] = function(test){
-    async.parallel([
-        async.reflect(function(callback){
-            callback('error', 1);
-        }),
-        async.reflect(function(callback){
-            callback('error2', 2);
-        }),
-        async.reflect(function(callback){
-            callback(null, 2);
-        })
-    ],
-    function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(results, [
-            { error: 'error' },
-            { error: 'error2' },
-            { value: 2 }
-        ]);
-        test.done();
-    });
-};
-
-exports['parallel does not continue replenishing after error'] = function (test) {
-    var started = 0;
-    var arr = [
-        funcToCall,
-        funcToCall,
-        funcToCall,
-        funcToCall,
-        funcToCall,
-        funcToCall,
-        funcToCall,
-        funcToCall,
-        funcToCall,
-    ];
-    var delay = 10;
-    var limit = 3;
-    var maxTime = 10 * arr.length;
-    function funcToCall(callback) {
-        started ++;
-        if (started === 3) {
-            return callback(new Error ("Test Error"));
-        }
-        setTimeout(function(){
-            callback();
-        }, delay);
-    }
-
-    async.parallelLimit(arr, limit, function(){});
-
-    setTimeout(function(){
-        test.equal(started, 3);
-        test.done();
-    }, maxTime);
-};
-
-
-exports['series'] = {
-
-    'series': function(test){
-    var call_order = [];
-    async.series([
-        function(callback){
-            setTimeout(function(){
-                call_order.push(1);
-                callback(null, 1);
-            }, 25);
-        },
-        function(callback){
-            setTimeout(function(){
-                call_order.push(2);
-                callback(null, 2);
-            }, 50);
-        },
-        function(callback){
-            setTimeout(function(){
-                call_order.push(3);
-                callback(null, 3,3);
-            }, 15);
-        }
-    ],
-    function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(results, [1,2,[3,3]]);
-        test.same(call_order, [1,2,3]);
-        test.done();
-    });
-},
-
-    'with reflect': function(test){
-    var call_order = [];
-    async.series([
-        async.reflect(function(callback){
-            setTimeout(function(){
-                call_order.push(1);
-                callback(null, 1);
-            }, 25);
-        }),
-        async.reflect(function(callback){
-            setTimeout(function(){
-                call_order.push(2);
-                callback(null, 2);
-            }, 50);
-        }),
-        async.reflect(function(callback){
-            setTimeout(function(){
-                call_order.push(3);
-                callback(null, 3,3);
-            }, 15);
-        })
-    ],
-    function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.deepEqual(results, [
-            { value: 1 },
-            { value: 2 },
-            { value: [3,3] }
-        ]);
-        test.same(call_order, [1,2,3]);
-        test.done();
-    });
-},
-
-    'empty array': function(test){
-    async.series([], function(err, results){
-        test.equals(err, null);
-        test.same(results, []);
-        test.done();
-    });
-},
-
-    'error': function(test){
-    test.expect(1);
-    async.series([
-        function(callback){
-            callback('error', 1);
-        },
-        function(callback){
-            test.ok(false, 'should not be called');
-            callback('error2', 2);
-        }
-    ],
-    function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 100);
-},
-
-    'error with reflect': function(test){
-    test.expect(2);
-    async.series([
-        async.reflect(function(callback){
-            callback('error', 1);
-        }),
-        async.reflect(function(callback){
-            callback('error2', 2);
-        }),
-        async.reflect(function(callback){
-            callback(null, 1);
-        })
-    ],
-    function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.deepEqual(results, [
-            { error: 'error' },
-            { error: 'error2' },
-            { value: 1 }
-        ]);
-        test.done();
-    });
-},
-
-    'no callback': function(test){
-    async.series([
-        function(callback){callback();},
-        function(callback){callback(); test.done();},
-    ]);
-},
-
-    'object': function(test){
-    var call_order = [];
-    async.series(getFunctionsObject(call_order), function(err, results){
-        test.equals(err, null);
-        test.same(results, {
-            one: 1,
-            two: 2,
-            three: [3,3]
-        });
-        test.same(call_order, [1,2,3]);
-        test.done();
-    });
-},
-
-    'call in another context': function(test) {
-    if (isBrowser()) {
-        // node only test
-        test.done();
-        return;
-    }
-    var vm = require('vm');
-    var sandbox = {
-        async: async,
-        test: test
-    };
-
-    var fn = "(" + (function () {
-        async.series([function (callback) {
-            callback();
-        }], function (err) {
-            if (err) {
-                return test.done(err);
-            }
-            test.done();
-        });
-    }).toString() + "())";
-
-    vm.runInNewContext(fn, sandbox);
-},
-
-    // Issue 10 on github: https://github.com/caolan/async/issues#issue/10
-    'falsy return values': function (test) {
-    function taskFalse(callback) {
-        async.nextTick(function() {
-            callback(null, false);
-        });
-    }
-    function taskUndefined(callback) {
-        async.nextTick(function() {
-            callback(null, undefined);
-        });
-    }
-    function taskEmpty(callback) {
-        async.nextTick(function() {
-            callback(null);
-        });
-    }
-    function taskNull(callback) {
-        async.nextTick(function() {
-            callback(null, null);
-        });
-    }
-    async.series(
-        [taskFalse, taskUndefined, taskEmpty, taskNull],
-        function(err, results) {
-            test.equal(results.length, 4);
-            test.strictEqual(results[0], false);
-            test.strictEqual(results[1], undefined);
-            test.strictEqual(results[2], undefined);
-            test.strictEqual(results[3], null);
-            test.done();
-        }
-    );
-}
-
-};
-
-
-exports['iterator'] = function(test){
-    var call_order = [];
-    var iterator = async.iterator([
-        function(){call_order.push(1);},
-        function(arg1){
-            test.equals(arg1, 'arg1');
-            call_order.push(2);
-        },
-        function(arg1, arg2){
-            test.equals(arg1, 'arg1');
-            test.equals(arg2, 'arg2');
-            call_order.push(3);
-        }
-    ]);
-    iterator();
-    test.same(call_order, [1]);
-    var iterator2 = iterator();
-    test.same(call_order, [1,1]);
-    var iterator3 = iterator2('arg1');
-    test.same(call_order, [1,1,2]);
-    var iterator4 = iterator3('arg1', 'arg2');
-    test.same(call_order, [1,1,2,3]);
-    test.equals(iterator4, undefined);
-    test.done();
-};
-
-exports['iterator empty array'] = function(test){
-    var iterator = async.iterator([]);
-    test.equals(iterator(), undefined);
-    test.equals(iterator.next(), undefined);
-    test.done();
-};
-
-exports['iterator.next'] = function(test){
-    var call_order = [];
-    var iterator = async.iterator([
-        function(){call_order.push(1);},
-        function(arg1){
-            test.equals(arg1, 'arg1');
-            call_order.push(2);
-        },
-        function(arg1, arg2){
-            test.equals(arg1, 'arg1');
-            test.equals(arg2, 'arg2');
-            call_order.push(3);
-        }
-    ]);
-    var fn = iterator.next();
-    var iterator2 = fn('arg1');
-    test.same(call_order, [2]);
-    iterator2('arg1','arg2');
-    test.same(call_order, [2,3]);
-    test.equals(iterator2.next(), undefined);
-    test.done();
-};
-
-exports['each'] = function(test){
-    var args = [];
-    async.each([1,3,2], eachIteratee.bind(this, args), function(err){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(args, [1,2,3]);
-        test.done();
-    });
-};
-
-exports['each extra callback'] = function(test){
-    var count = 0;
-    async.each([1,3,2], function(val, callback) {
-        count++;
-        var done = count == 3;
-        callback();
-        test.throws(callback);
-        if (done) {
-            test.done();
-        }
-    });
-};
-
-exports['each empty array'] = function(test){
-    test.expect(1);
-    async.each([], function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-
-exports['each empty array, with other property on the array'] = function(test){
-    test.expect(1);
-    var myArray = [];
-    myArray.myProp = "anything";
-    async.each(myArray, function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-
-exports['each error'] = function(test){
-    test.expect(1);
-    async.each([1,2,3], function(x, callback){
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-};
-
-exports['each no callback'] = function(test){
-    async.each([1], eachNoCallbackIteratee.bind(this, test));
-};
-
-exports['forEach alias'] = function (test) {
-    test.strictEqual(async.each, async.forEach);
-    test.done();
-};
-
-exports['forEachOf'] = function(test){
-    var args = [];
-    async.forEachOf({ a: 1, b: 2 }, forEachOfIteratee.bind(this, args), function(err){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(args, ["a", 1, "b", 2]);
-        test.done();
-    });
-};
-
-exports['forEachOf - instant resolver'] = function(test){
-    test.expect(1);
-    var args = [];
-    async.forEachOf({ a: 1, b: 2 }, function(x, k, cb) {
-        args.push(k, x);
-        cb();
-    }, function(){
-        // ensures done callback isn't called before all items iterated
-        test.same(args, ["a", 1, "b", 2]);
-        test.done();
-    });
-};
-
-exports['forEachOf empty object'] = function(test){
-    test.expect(1);
-    async.forEachOf({}, function(value, key, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err) {
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['forEachOf empty array'] = function(test){
-    test.expect(1);
-    async.forEachOf([], function(value, key, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err) {
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['forEachOf error'] = function(test){
-    test.expect(1);
-    async.forEachOf({ a: 1, b: 2 }, function(value, key, callback) {
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-};
-
-exports['forEachOf no callback'] = function(test){
-    async.forEachOf({ a: 1 }, forEachOfNoCallbackIteratee.bind(this, test));
-};
-
-exports['eachOf alias'] = function(test){
-    test.equals(async.eachOf, async.forEachOf);
-    test.done();
-};
-
-exports['forEachOf with array'] = function(test){
-    var args = [];
-    async.forEachOf([ "a", "b" ], forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [0, "a", 1, "b"]);
-        test.done();
-    });
-};
-
-exports['forEachOf with Set (iterators)'] = function(test){
-    if (typeof Set !== 'function')
-        return test.done();
-
-    var args = [];
-    var set = new Set();
-    set.add("a");
-    set.add("b");
-    async.forEachOf(set, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [0, "a", 1, "b"]);
-        test.done();
-    });
-};
-
-exports['forEachOf with Map (iterators)'] = function(test){
-    if (typeof Map !== 'function')
-        return test.done();
-
-    var args = [];
-    var map = new Map();
-    map.set(1, "a");
-    map.set(2, "b");
-    async.forEachOf(map, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [0, [1, "a"], 1, [2, "b"]]);
-        test.done();
-    });
-};
-
-exports['eachSeries'] = function(test){
-    var args = [];
-    async.eachSeries([1,3,2], eachIteratee.bind(this, args), function(err){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(args, [1,3,2]);
-        test.done();
-    });
-};
-
-exports['eachSeries empty array'] = function(test){
-    test.expect(1);
-    async.eachSeries([], function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['eachSeries array modification'] = function(test) {
-    test.expect(1);
-    var arr = [1, 2, 3, 4];
-    async.eachSeries(arr, function (x, callback) {
-        async.setImmediate(callback);
-    }, function () {
-        test.ok(true, 'should call callback');
-    });
-
-    arr.pop();
-    arr.splice(0, 1);
-
-    setTimeout(test.done, 50);
-};
-
-// bug #782.  Remove in next major release
-exports['eachSeries single item'] = function (test) {
-    test.expect(1);
-    var sync = true;
-    async.eachSeries([1], function (i, cb) {
-        cb(null);
-    }, function () {
-        test.ok(sync, "callback not called on same tick");
-    });
-    sync = false;
-    test.done();
-};
-
-// bug #782.  Remove in next major release
-exports['eachSeries single item'] = function (test) {
-    test.expect(1);
-    var sync = true;
-    async.eachSeries([1], function (i, cb) {
-        cb(null);
-    }, function () {
-        test.ok(sync, "callback not called on same tick");
-    });
-    sync = false;
-    test.done();
-};
-
-exports['eachSeries error'] = function(test){
-    test.expect(2);
-    var call_order = [];
-    async.eachSeries([1,2,3], function(x, callback){
-        call_order.push(x);
-        callback('error');
-    }, function(err){
-        test.same(call_order, [1]);
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-};
-
-exports['eachSeries no callback'] = function(test){
-    async.eachSeries([1], eachNoCallbackIteratee.bind(this, test));
-};
-
-
-exports['eachLimit'] = function(test){
-    var args = [];
-    var arr = [0,1,2,3,4,5,6,7,8,9];
-    async.eachLimit(arr, 2, function(x,callback){
-        setTimeout(function(){
-            args.push(x);
-            callback();
-        }, x*5);
-    }, function(err){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(args, arr);
-        test.done();
-    });
-};
-
-exports['eachLimit empty array'] = function(test){
-    test.expect(1);
-    async.eachLimit([], 2, function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['eachLimit limit exceeds size'] = function(test){
-    var args = [];
-    var arr = [0,1,2,3,4,5,6,7,8,9];
-    async.eachLimit(arr, 20, eachIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, arr);
-        test.done();
-    });
-};
-
-exports['eachLimit limit equal size'] = function(test){
-    var args = [];
-    var arr = [0,1,2,3,4,5,6,7,8,9];
-    async.eachLimit(arr, 10, eachIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, arr);
-        test.done();
-    });
-};
-
-exports['eachLimit zero limit'] = function(test){
-    test.expect(1);
-    async.eachLimit([0,1,2,3,4,5], 0, function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['eachLimit error'] = function(test){
-    test.expect(2);
-    var arr = [0,1,2,3,4,5,6,7,8,9];
-    var call_order = [];
-
-    async.eachLimit(arr, 3, function(x, callback){
-        call_order.push(x);
-        if (x === 2) {
-            callback('error');
-        }
-    }, function(err){
-        test.same(call_order, [0,1,2]);
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['eachLimit no callback'] = function(test){
-    async.eachLimit([1], 1, eachNoCallbackIteratee.bind(this, test));
-};
-
-exports['eachLimit synchronous'] = function(test){
-    var args = [];
-    var arr = [0,1,2];
-    async.eachLimit(arr, 5, function(x,callback){
-        args.push(x);
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.same(args, arr);
-        test.done();
-    });
-};
-
-
-exports['eachLimit does not continue replenishing after error'] = function (test) {
-    var started = 0;
-    var arr = [0,1,2,3,4,5,6,7,8,9];
-    var delay = 10;
-    var limit = 3;
-    var maxTime = 10 * arr.length;
-
-    async.eachLimit(arr, limit, function(x, callback) {
-        started ++;
-        if (started === 3) {
-            return callback(new Error ("Test Error"));
-        }
-        setTimeout(function(){
-            callback();
-        }, delay);
-    }, function(){});
-
-    setTimeout(function(){
-        test.equal(started, 3);
-        test.done();
-    }, maxTime);
-};
-
-exports['forEachSeries alias'] = function (test) {
-    test.strictEqual(async.eachSeries, async.forEachSeries);
-    test.done();
-};
-
-exports['forEachOfSeries'] = function(test){
-    var args = [];
-    async.forEachOfSeries({ a: 1, b: 2 }, forEachOfIteratee.bind(this, args), function(err){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(args, [ "a", 1, "b", 2 ]);
-        test.done();
-    });
-};
-
-exports['forEachOfSeries empty object'] = function(test){
-    test.expect(1);
-    async.forEachOfSeries({}, function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['forEachOfSeries error'] = function(test){
-    test.expect(2);
-    var call_order = [];
-    async.forEachOfSeries({ a: 1, b: 2 }, function(value, key, callback){
-        call_order.push(value, key);
-        callback('error');
-    }, function(err){
-        test.same(call_order, [ 1, "a" ]);
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-};
-
-exports['forEachOfSeries no callback'] = function(test){
-    async.forEachOfSeries({ a: 1 }, forEachOfNoCallbackIteratee.bind(this, test));
-};
-
-exports['forEachOfSeries with array'] = function(test){
-    var args = [];
-    async.forEachOfSeries([ "a", "b" ], forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [ 0, "a", 1, "b" ]);
-        test.done();
-    });
-};
-
-exports['forEachOfSeries with Set (iterators)'] = function(test){
-    if (typeof Set !== 'function')
-        return test.done();
-
-    var args = [];
-    var set = new Set();
-    set.add("a");
-    set.add("b");
-    async.forEachOfSeries(set, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [0, "a", 1, "b"]);
-        test.done();
-    });
-};
-
-exports['forEachOfSeries with Map (iterators)'] = function(test){
-    if (typeof Map !== 'function')
-        return test.done();
-
-    var args = [];
-    var map = new Map();
-    map.set(1, "a");
-    map.set(2, "b");
-    async.forEachOfSeries(map, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [0, [1, "a"], 1, [2, "b"]]);
-        test.done();
-    });
-};
-
-exports['eachOfLimit alias'] = function(test){
-    test.equals(async.eachOfLimit, async.forEachOfLimit);
-    test.done();
-};
-
-
-exports['eachOfSeries alias'] = function(test){
-    test.equals(async.eachOfSeries, async.forEachOfSeries);
-    test.done();
-};
-
-exports['forEachLimit alias'] = function (test) {
-    test.strictEqual(async.eachLimit, async.forEachLimit);
-    test.done();
-};
-
-exports['forEachOfLimit'] = function(test){
-    var args = [];
-    var obj = { a: 1, b: 2, c: 3, d: 4 };
-    async.forEachOfLimit(obj, 2, function(value, key, callback){
-        setTimeout(function(){
-            args.push(value, key);
-            callback();
-        }, value * 5);
-    }, function(err){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(args, [ 1, "a", 2, "b", 3, "c", 4, "d" ]);
-        test.done();
-    });
-};
-
-exports['forEachOfLimit empty object'] = function(test){
-    test.expect(1);
-    async.forEachOfLimit({}, 2, function(value, key, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['forEachOfLimit limit exceeds size'] = function(test){
-    var args = [];
-    var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
-    async.forEachOfLimit(obj, 10, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [ "a", 1, "b", 2, "c", 3, "d", 4, "e", 5 ]);
-        test.done();
-    });
-};
-
-exports['forEachOfLimit limit equal size'] = function(test){
-    var args = [];
-    var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
-    async.forEachOfLimit(obj, 5, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [ "a", 1, "b", 2, "c", 3, "d", 4, "e", 5 ]);
-        test.done();
-    });
-};
-
-exports['forEachOfLimit zero limit'] = function(test){
-    test.expect(1);
-    async.forEachOfLimit({ a: 1, b: 2 }, 0, function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['forEachOfLimit error'] = function(test){
-    test.expect(2);
-    var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
-    var call_order = [];
-
-    async.forEachOfLimit(obj, 3, function(value, key, callback){
-        call_order.push(value, key);
-        if (value === 2) {
-            callback('error');
-        }
-    }, function(err){
-        test.same(call_order, [ 1, "a", 2, "b" ]);
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 25);
-};
-
-exports['forEachOfLimit no callback'] = function(test){
-    async.forEachOfLimit({ a: 1 }, 1, forEachOfNoCallbackIteratee.bind(this, test));
-};
-
-exports['forEachOfLimit synchronous'] = function(test){
-    var args = [];
-    var obj = { a: 1, b: 2 };
-    async.forEachOfLimit(obj, 5, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [ "a", 1, "b", 2 ]);
-        test.done();
-    });
-};
-
-exports['forEachOfLimit with array'] = function(test){
-    var args = [];
-    var arr = [ "a", "b" ];
-    async.forEachOfLimit(arr, 1, forEachOfIteratee.bind(this, args), function (err) {
-        if (err) throw err;
-        test.same(args, [ 0, "a", 1, "b" ]);
-        test.done();
-    });
-};
-
-exports['forEachOfLimit with Set (iterators)'] = function(test){
-    if (typeof Set !== 'function')
-        return test.done();
-
-    var args = [];
-    var set = new Set();
-    set.add("a");
-    set.add("b");
-    async.forEachOfLimit(set, 1, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [0, "a", 1, "b"]);
-        test.done();
-    });
-};
-
-exports['forEachOfLimit with Map (iterators)'] = function(test){
-    if (typeof Map !== 'function')
-        return test.done();
-
-    var args = [];
-    var map = new Map();
-    map.set(1, "a");
-    map.set(2, "b");
-    async.forEachOfLimit(map, 1, forEachOfIteratee.bind(this, args), function(err){
-        if (err) throw err;
-        test.same(args, [0, [1, "a"], 1, [2, "b"]]);
-        test.done();
-    });
-};
-
-exports['map'] = {
-
-    'basic': function(test){
-    var call_order = [];
-    async.map([1,3,2], mapIteratee.bind(this, call_order), function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(call_order, [1,2,3]);
-        test.same(results, [2,6,4]);
-        test.done();
-    });
-},
-
-    'with reflect': function(test){
-    var call_order = [];
-    async.map([1,3,2], async.reflect(function(item, cb) {
-        setTimeout(function(){
-            call_order.push(item);
-            cb(null, item*2);
-        }, item*25);
-    }), function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(call_order, [1,2,3]);
-        test.same(results, [
-            { value: 2 },
-            { value: 6 },
-            { value: 4 }
-        ]);
-        test.done();
-    });
-},
-
-    'error with reflect': function(test){
-    var call_order = [];
-    async.map([-1,1,3,2], async.reflect(function(item, cb) {
-        setTimeout(function(){
-            call_order.push(item);
-            if (item < 0) {
-                cb('number less then zero');
-            } else {
-                cb(null, item*2);
-            }
-
-        }, item*25);
-    }), function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(call_order, [-1,1,2,3]);
-        test.same(results, [
-            { error: 'number less then zero' },
-            { value: 2 },
-            { value: 6 },
-            { value: 4 }
-        ]);
-        test.done();
-    });
-},
-
-    'map original untouched': function(test){
-    var a = [1,2,3];
-    async.map(a, function(x, callback){
-        callback(null, x*2);
-    }, function(err, results){
-        test.same(results, [2,4,6]);
-        test.same(a, [1,2,3]);
-        test.done();
-    });
-},
-
-    'map without main callback': function(test){
-    var a = [1,2,3];
-    var r = [];
-    async.map(a, function(x, callback){
-        r.push(x);
-        var done = r.length == a.length;
-        callback(null);
-        if (done) {
-            test.same(r, a);
-            test.done();
-        }
-    });
-},
-
-    'map error': function(test){
-    test.expect(1);
-    async.map([1,2,3], function(x, callback){
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-},
-
-    'map undefined array': function(test){
-    test.expect(2);
-    async.map(undefined, function(x, callback){
-        callback();
-    }, function(err, result){
-        test.equals(err, null);
-        test.same(result, []);
-    });
-    setTimeout(test.done, 50);
-},
-
-    'map object': function (test) {
-    async.map({a: 1, b: 2, c: 3}, function (val, callback) {
-        callback(null, val * 2);
-    }, function (err, result) {
-        if (err) throw err;
-        test.equals(Object.prototype.toString.call(result), '[object Object]');
-        test.same(result, {a: 2, b: 4, c: 6});
-        test.done();
-    });
-},
-
-    'mapSeries': function(test){
-    var call_order = [];
-    async.mapSeries([1,3,2], mapIteratee.bind(this, call_order), function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(call_order, [1,3,2]);
-        test.same(results, [2,6,4]);
-        test.done();
-    });
-},
-
-    'mapSeries error': function(test){
-    test.expect(1);
-    async.mapSeries([1,2,3], function(x, callback){
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-},
-
-    'mapSeries undefined array': function(test){
-    test.expect(2);
-    async.mapSeries(undefined, function(x, callback){
-        callback();
-    }, function(err, result){
-        test.equals(err, null);
-        test.same(result, []);
-    });
-    setTimeout(test.done, 50);
-},
-
-    'mapSeries object': function (test) {
-    async.mapSeries({a: 1, b: 2, c: 3}, function (val, callback) {
-        callback(null, val * 2);
-    }, function (err, result) {
-        if (err) throw err;
-        test.same(result, {a: 2, b: 4, c: 6});
-        test.done();
-    });
-},
-
-    'mapLimit': function(test){
-    var call_order = [];
-    async.mapLimit([2,4,3], 2, mapIteratee.bind(this, call_order), function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(call_order, [2,4,3]);
-        test.same(results, [4,8,6]);
-        test.done();
-    });
-},
-
-    'mapLimit empty array': function(test){
-    test.expect(1);
-    async.mapLimit([], 2, function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-},
-
-    'mapLimit undefined array': function(test){
-    test.expect(2);
-    async.mapLimit(undefined, 2, function(x, callback){
-        callback();
-    }, function(err, result){
-        test.equals(err, null);
-        test.same(result, []);
-    });
-    setTimeout(test.done, 50);
-},
-
-    'mapLimit limit exceeds size': function(test){
-    var call_order = [];
-    async.mapLimit([0,1,2,3,4,5,6,7,8,9], 20, mapIteratee.bind(this, call_order), function(err, results){
-        test.same(call_order, [0,1,2,3,4,5,6,7,8,9]);
-        test.same(results, [0,2,4,6,8,10,12,14,16,18]);
-        test.done();
-    });
-},
-
-    'mapLimit limit equal size': function(test){
-    var call_order = [];
-    async.mapLimit([0,1,2,3,4,5,6,7,8,9], 10, mapIteratee.bind(this, call_order), function(err, results){
-        test.same(call_order, [0,1,2,3,4,5,6,7,8,9]);
-        test.same(results, [0,2,4,6,8,10,12,14,16,18]);
-        test.done();
-    });
-},
-
-    'mapLimit zero limit': function(test){
-    test.expect(2);
-    async.mapLimit([0,1,2,3,4,5], 0, function(x, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err, results){
-        test.same(results, []);
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-},
-
-    'mapLimit error': function(test){
-    test.expect(2);
-    var arr = [0,1,2,3,4,5,6,7,8,9];
-    var call_order = [];
-
-    async.mapLimit(arr, 3, function(x, callback){
-        call_order.push(x);
-        if (x === 2) {
-            callback('error');
-        }
-    }, function(err){
-        test.same(call_order, [0,1,2]);
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 25);
-},
-
-    'mapLimit does not continue replenishing after error': function (test) {
-    var started = 0;
-    var arr = [0,1,2,3,4,5,6,7,8,9];
-    var delay = 10;
-    var limit = 3;
-    var maxTime = 10 * arr.length;
-
-    async.mapLimit(arr, limit, function(x, callback) {
-        started ++;
-        if (started === 3) {
-            return callback(new Error ("Test Error"));
-        }
-        setTimeout(function(){
-            callback();
-        }, delay);
-    }, function(){});
-
-    setTimeout(function(){
-        test.equal(started, 3);
-        test.done();
-    }, maxTime);
-},
-
-    'map with Map': function(test) {
-    if (typeof Map !== 'function')
-        return test.done();
-
-    var map = new Map();
-    map.set(1, "a");
-    map.set(2, "b");
-    async.map(map, function(val, cb) {
-        cb(null, val);
-    }, function (err, result) {
-        test.ok(Array.isArray(result), "map should return an array for an iterable");
-        test.done();
-    });
-}
-
-};
-
-
-exports['reduce'] = function(test){
-    var call_order = [];
-    async.reduce([1,2,3], 0, function(a, x, callback){
-        call_order.push(x);
-        callback(null, a + x);
-    }, function(err, result){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.equals(result, 6);
-        test.same(call_order, [1,2,3]);
-        test.done();
-    });
-};
-
-exports['reduce async with non-reference memo'] = function(test){
-    async.reduce([1,3,2], 0, function(a, x, callback){
-        setTimeout(function(){callback(null, a + x);}, Math.random()*100);
-    }, function(err, result){
-        test.equals(result, 6);
-        test.done();
-    });
-};
-
-exports['reduce error'] = function(test){
-    test.expect(1);
-    async.reduce([1,2,3], 0, function(a, x, callback){
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-};
-
-exports['inject alias'] = function(test){
-    test.equals(async.inject, async.reduce);
-    test.done();
-};
-
-exports['foldl alias'] = function(test){
-    test.equals(async.foldl, async.reduce);
-    test.done();
-};
-
-exports['reduceRight'] = function(test){
-    var call_order = [];
-    var a = [1,2,3];
-    async.reduceRight(a, 0, function(a, x, callback){
-        call_order.push(x);
-        callback(null, a + x);
-    }, function(err, result){
-        test.equals(result, 6);
-        test.same(call_order, [3,2,1]);
-        test.same(a, [1,2,3]);
-        test.done();
-    });
-};
-
-exports['foldr alias'] = function(test){
-    test.equals(async.foldr, async.reduceRight);
-    test.done();
-};
-
-exports['transform implictly determines memo if not provided'] = function(test){
-    async.transform([1,2,3], function(memo, x, v, callback){
-        memo.push(x + 1);
-        callback();
-    }, function(err, result){
-        test.same(result, [2, 3, 4]);
-        test.done();
-    });
-};
-
-exports['transform async with object memo'] = function(test){
-    test.expect(2);
-
-    async.transform([1,3,2], {}, function(memo, v, k, callback){
-        setTimeout(function() {
-            memo[k] = v;
-            callback();
-        });
-    }, function(err, result) {
-        test.equals(err, null);
-        test.same(result, {
-            0: 1,
-            1: 3,
-            2: 2
-        });
-        test.done();
-    });
-};
-
-exports['transform iterating object'] = function(test){
-    test.expect(2);
-
-    async.transform({a: 1, b: 3, c: 2}, function(memo, v, k, callback){
-        setTimeout(function() {
-            memo[k] = v + 1;
-            callback();
-        });
-    }, function(err, result) {
-        test.equals(err, null);
-        test.same(result, {a: 2, b: 4, c: 3});
-        test.done();
-    });
-};
-
-exports['transform error'] = function(test){
-    async.transform([1,2,3], function(a, v, k, callback){
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-        test.done();
-    });
-};
-
-exports['sortBy'] = function(test){
-    test.expect(2);
-
-    async.sortBy([{a:1},{a:15},{a:6}], function(x, callback){
-        setTimeout(function(){callback(null, x.a);}, 0);
-    }, function(err, result){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(result, [{a:1},{a:6},{a:15}]);
-        test.done();
-    });
-};
-
-exports['sortBy inverted'] = function(test){
-    test.expect(1);
-
-    async.sortBy([{a:1},{a:15},{a:6}], function(x, callback){
-        setTimeout(function(){callback(null, x.a*-1);}, 0);
-    }, function(err, result){
-        test.same(result, [{a:15},{a:6},{a:1}]);
-        test.done();
-    });
-};
-
-exports['sortBy error'] = function(test){
-    test.expect(1);
-    var error = new Error('asdas');
-    async.sortBy([{a:1},{a:15},{a:6}], function(x, callback){
-        async.setImmediate(function(){
-            callback(error);
-        });
-    }, function(err){
-        test.equal(err, error);
-        test.done();
-    });
-};
-
-exports['apply'] = function(test){
-    test.expect(6);
-    var fn = function(){
-        test.same(Array.prototype.slice.call(arguments), [1,2,3,4]);
-    };
-    async.apply(fn, 1, 2, 3, 4)();
-    async.apply(fn, 1, 2, 3)(4);
-    async.apply(fn, 1, 2)(3, 4);
-    async.apply(fn, 1)(2, 3, 4);
-    async.apply(fn)(1, 2, 3, 4);
-    test.equals(
-        async.apply(function(name){return 'hello ' + name;}, 'world')(),
-        'hello world'
-    );
-    test.done();
-};
-
-
-// generates tests for console functions such as async.log
-var console_fn_tests = function(name){
-
-    if (typeof console !== 'undefined') {
-        exports[name] = function(test){
-            test.expect(5);
-            var fn = function(arg1, callback){
-                test.equals(arg1, 'one');
-                setTimeout(function(){callback(null, 'test');}, 0);
-            };
-            var fn_err = function(arg1, callback){
-                test.equals(arg1, 'one');
-                setTimeout(function(){callback('error');}, 0);
-            };
-            var _console_fn = console[name];
-            var _error = console.error;
-            console[name] = function(val){
-                test.equals(val, 'test');
-                test.equals(arguments.length, 1);
-                console.error = function(val){
-                    test.equals(val, 'error');
-                    console[name] = _console_fn;
-                    console.error = _error;
-                    test.done();
-                };
-                async[name](fn_err, 'one');
-            };
-            async[name](fn, 'one');
-        };
-
-        exports[name + ' with multiple result params'] = function(test){
-            test.expect(1);
-            var fn = function(callback){callback(null,'one','two','three');};
-            var _console_fn = console[name];
-            var called_with = [];
-            console[name] = function(x){
-                called_with.push(x);
-            };
-            async[name](fn);
-            test.same(called_with, ['one','two','three']);
-            console[name] = _console_fn;
-            test.done();
-        };
-    }
-
-    // browser-only test
-    exports[name + ' without console.' + name] = function(test){
-        if (typeof window !== 'undefined') {
-            var _console = window.console;
-            window.console = undefined;
-            var fn = function(callback){callback(null, 'val');};
-            var fn_err = function(callback){callback('error');};
-            async[name](fn);
-            async[name](fn_err);
-            window.console = _console;
-        }
-        test.done();
-    };
-
-};
-
-
-exports['times'] = {
-
-    'times': function(test) {
-    test.expect(2);
-    async.times(5, function(n, next) {
-        next(null, n);
-    }, function(err, results) {
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(results, [0,1,2,3,4]);
-        test.done();
-    });
-},
-
-    'times 3': function(test){
-    test.expect(1);
-    var args = [];
-    async.times(3, function(n, callback){
-        setTimeout(function(){
-            args.push(n);
-            callback();
-        }, n * 25);
-    }, function(err){
-        if (err) throw err;
-        test.same(args, [0,1,2]);
-        test.done();
-    });
-},
-
-    'times 0': function(test){
-    test.expect(1);
-    async.times(0, function(n, callback){
-        test.ok(false, 'iteratee should not be called');
-        callback();
-    }, function(err){
-        if (err) throw err;
-        test.ok(true, 'should call callback');
-    });
-    setTimeout(test.done, 25);
-},
-
-    'times error': function(test){
-    test.expect(1);
-    async.times(3, function(n, callback){
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-},
-
-    'timesSeries': function(test){
-    test.expect(2);
-    var call_order = [];
-    async.timesSeries(5, function(n, callback){
-        setTimeout(function(){
-            call_order.push(n);
-            callback(null, n);
-        }, 100 - n * 10);
-    }, function(err, results){
-        test.same(call_order, [0,1,2,3,4]);
-        test.same(results, [0,1,2,3,4]);
-        test.done();
-    });
-},
-
-    'timesSeries error': function(test){
-    test.expect(1);
-    async.timesSeries(5, function(n, callback){
-        callback('error');
-    }, function(err){
-        test.equals(err, 'error');
-    });
-    setTimeout(test.done, 50);
-},
-
-    'timesLimit': function(test){
-    test.expect(7);
-
-    var limit = 2;
-    var running = 0;
-    async.timesLimit(5, limit, function (i, next) {
-        running++;
-        test.ok(running <= limit && running > 0, running);
-        setTimeout(function () {
-            running--;
-            next(null, i * 2);
-        }, (3 - i) * 10);
-    }, function(err, results){
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.same(results, [0, 2, 4, 6, 8]);
-        test.done();
-    });
-}
-
-};
-
-console_fn_tests('log');
-console_fn_tests('dir');
-/*console_fn_tests('info');
-console_fn_tests('warn');
-console_fn_tests('error');*/
-
-
-exports['concat'] = function(test){
-    test.expect(3);
-    var call_order = [];
-    var iteratee = function (x, cb) {
-        setTimeout(function(){
-            call_order.push(x);
-            var r = [];
-            while (x > 0) {
-                r.push(x);
-                x--;
-            }
-            cb(null, r);
-        }, x*25);
-    };
-    async.concat([1,3,2], iteratee, function(err, results){
-        test.same(results, [1,2,1,3,2,1]);
-        test.same(call_order, [1,2,3]);
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.done();
-    });
-};
-
-exports['concat error'] = function(test){
-    test.expect(1);
-    var iteratee = function (x, cb) {
-        cb(new Error('test error'));
-    };
-    async.concat([1,2,3], iteratee, function(err){
-        test.ok(err);
-        test.done();
-    });
-};
-
-exports['concatSeries'] = function(test){
-    test.expect(3);
-    var call_order = [];
-    var iteratee = function (x, cb) {
-        setTimeout(function(){
-            call_order.push(x);
-            var r = [];
-            while (x > 0) {
-                r.push(x);
-                x--;
-            }
-            cb(null, r);
-        }, x*25);
-    };
-    async.concatSeries([1,3,2], iteratee, function(err, results){
-        test.same(results, [1,3,2,1,2,1]);
-        test.same(call_order, [1,3,2]);
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.done();
-    });
-};
-
-exports['until'] = function (test) {
-    test.expect(4);
-
-    var call_order = [];
-    var count = 0;
-    async.until(
-        function () {
-            call_order.push(['test', count]);
-            return (count == 5);
-        },
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb(null, count);
-        },
-        function (err, result) {
-            test.ok(err === null, err + " passed instead of 'null'");
-            test.equals(result, 5, 'last result passed through');
-            test.same(call_order, [
-                ['test', 0],
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5],
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['doUntil'] = function (test) {
-    test.expect(4);
-
-    var call_order = [];
-    var count = 0;
-    async.doUntil(
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb(null, count);
-        },
-        function () {
-            call_order.push(['test', count]);
-            return (count == 5);
-        },
-        function (err, result) {
-            test.ok(err === null, err + " passed instead of 'null'");
-            test.equals(result, 5, 'last result passed through');
-            test.same(call_order, [
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5]
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['doUntil callback params'] = function (test) {
-    test.expect(3);
-
-    var call_order = [];
-    var count = 0;
-    async.doUntil(
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb(null, count);
-        },
-        function (c) {
-            call_order.push(['test', c]);
-            return (c == 5);
-        },
-        function (err, result) {
-            if (err) throw err;
-            test.equals(result, 5, 'last result passed through');
-            test.same(call_order, [
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5]
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['whilst'] = function (test) {
-    test.expect(4);
-
-    var call_order = [];
-
-    var count = 0;
-    async.whilst(
-        function () {
-            call_order.push(['test', count]);
-            return (count < 5);
-        },
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb(null, count);
-        },
-        function (err, result) {
-            test.ok(err === null, err + " passed instead of 'null'");
-            test.equals(result, 5, 'last result passed through');
-            test.same(call_order, [
-                ['test', 0],
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5],
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['doWhilst'] = function (test) {
-    test.expect(4);
-    var call_order = [];
-
-    var count = 0;
-    async.doWhilst(
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb(null, count);
-        },
-        function () {
-            call_order.push(['test', count]);
-            return (count < 5);
-        },
-        function (err, result) {
-            test.ok(err === null, err + " passed instead of 'null'");
-            test.equals(result, 5, 'last result passed through');
-            test.same(call_order, [
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5]
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['doWhilst callback params'] = function (test) {
-    test.expect(3);
-    var call_order = [];
-    var count = 0;
-    async.doWhilst(
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb(null, count);
-        },
-        function (c) {
-            call_order.push(['test', c]);
-            return (c < 5);
-        },
-        function (err, result) {
-            if (err) throw err;
-            test.equals(result, 5, 'last result passed through');
-            test.same(call_order, [
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5]
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['doWhilst - error'] = function (test) {
-    test.expect(1);
-    var error = new Error('asdas');
-
-    async.doWhilst(
-        function (cb) {
-            cb(error);
-        },
-        function () {},
-        function (err) {
-            test.equal(err, error);
-            test.done();
-        }
-    );
-};
-
-exports['during'] = function (test) {
-    var call_order = [];
-
-    var count = 0;
-    async.during(
-        function (cb) {
-            call_order.push(['test', count]);
-            cb(null, count < 5);
-        },
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb();
-        },
-        function (err) {
-            test.ok(err === null, err + " passed instead of 'null'");
-            test.same(call_order, [
-                ['test', 0],
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5],
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['doDuring'] = function (test) {
-    var call_order = [];
-
-    var count = 0;
-    async.doDuring(
-        function (cb) {
-            call_order.push(['iteratee', count]);
-            count++;
-            cb();
-        },
-        function (cb) {
-            call_order.push(['test', count]);
-            cb(null, count < 5);
-        },
-        function (err) {
-            test.ok(err === null, err + " passed instead of 'null'");
-            test.same(call_order, [
-                ['iteratee', 0], ['test', 1],
-                ['iteratee', 1], ['test', 2],
-                ['iteratee', 2], ['test', 3],
-                ['iteratee', 3], ['test', 4],
-                ['iteratee', 4], ['test', 5],
-            ]);
-            test.equals(count, 5);
-            test.done();
-        }
-    );
-};
-
-exports['doDuring - error test'] = function (test) {
-    test.expect(1);
-    var error = new Error('asdas');
-
-    async.doDuring(
-        function (cb) {
-            cb(error);
-        },
-        function () {},
-        function (err) {
-            test.equal(err, error);
-            test.done();
-        }
-    );
-};
-
-exports['doDuring - error iteratee'] = function (test) {
-    test.expect(1);
-    var error = new Error('asdas');
-
-    async.doDuring(
-        function (cb) {
-            cb(null);
-        },
-        function (cb) {
-            cb(error);
-        },
-        function (err) {
-            test.equal(err, error);
-            test.done();
-        }
-    );
-};
-
-exports['whilst optional callback'] = function (test) {
-    var counter = 0;
-    async.whilst(
-        function () { return counter < 2; },
-        function (cb) {
-            counter++;
-            cb();
-        }
-    );
-    test.equal(counter, 2);
-    test.done();
-};
-
-
-exports['memoize'] = {
-
-    'memoize': function (test) {
-    test.expect(5);
-    var call_order = [];
-
-    var fn = function (arg1, arg2, callback) {
-        async.setImmediate(function () {
-            call_order.push(['fn', arg1, arg2]);
-            callback(null, arg1 + arg2);
-        });
-    };
-
-    var fn2 = async.memoize(fn);
-    fn2(1, 2, function (err, result) {
-        test.ok(err === null, err + " passed instead of 'null'");
-        test.equal(result, 3);
-        fn2(1, 2, function (err, result) {
-            test.equal(result, 3);
-            fn2(2, 2, function (err, result) {
-                test.equal(result, 4);
-                test.same(call_order, [['fn',1,2], ['fn',2,2]]);
-                test.done();
-            });
-        });
-    });
-},
-
-    'maintains asynchrony': function (test) {
-    test.expect(3);
-    var call_order = [];
-
-    var fn = function (arg1, arg2, callback) {
-        call_order.push(['fn', arg1, arg2]);
-        async.setImmediate(function () {
-            call_order.push(['cb', arg1, arg2]);
-            callback(null, arg1 + arg2);
-        });
-    };
-
-    var fn2 = async.memoize(fn);
-    fn2(1, 2, function (err, result) {
-        test.equal(result, 3);
-        fn2(1, 2, function (err, result) {
-            test.equal(result, 3);
-            async.nextTick(memoize_done);
-            call_order.push('tick3');
-        });
-        call_order.push('tick2');
-    });
-    call_order.push('tick1');
-
-    function memoize_done() {
-        var async_call_order = [
-            ['fn',1,2],             // initial async call
-            'tick1',                // async caller
-            ['cb',1,2],             // async callback
-        //  ['fn',1,2], // memoized // memoized async body
-            'tick2',                // handler for first async call
-        //  ['cb',1,2], // memoized // memoized async response body
-            'tick3'                 // handler for memoized async call
-        ];
-        test.same(call_order, async_call_order);
-        test.done();
-    }
-},
-
-    'unmemoize': function(test) {
-    test.expect(4);
-    var call_order = [];
-
-    var fn = function (arg1, arg2, callback) {
-        call_order.push(['fn', arg1, arg2]);
-        async.setImmediate(function () {
-            callback(null, arg1 + arg2);
-        });
-    };
-
-    var fn2 = async.memoize(fn);
-    var fn3 = async.unmemoize(fn2);
-    fn3(1, 2, function (err, result) {
-        test.equal(result, 3);
-        fn3(1, 2, function (err, result) {
-            test.equal(result, 3);
-            fn3(2, 2, function (err, result) {
-                test.equal(result, 4);
-                test.same(call_order, [['fn',1,2], ['fn',1,2], ['fn',2,2]]);
-                test.done();
-            });
-        });
-    });
-},
-
-    'unmemoize a not memoized function': function(test) {
-    test.expect(1);
-
-    var fn = function (arg1, arg2, callback) {
-        callback(null, arg1 + arg2);
-    };
-
-    var fn2 = async.unmemoize(fn);
-    fn2(1, 2, function(err, result) {
-        test.equal(result, 3);
-    });
-
-    test.done();
-},
-
-    'error': function (test) {
-    test.expect(1);
-    var testerr = new Error('test');
-    var fn = function (arg1, arg2, callback) {
-        callback(testerr, arg1 + arg2);
-    };
-    async.memoize(fn)(1, 2, function (err) {
-        test.equal(err, testerr);
-    });
-    test.done();
-},
-
-    'multiple calls': function (test) {
-    test.expect(3);
-    var fn = function (arg1, arg2, callback) {
-        test.ok(true);
-        setTimeout(function(){
-            callback(null, arg1, arg2);
-        }, 10);
-    };
-    var fn2 = async.memoize(fn);
-    fn2(1, 2, function(err, result) {
-        test.equal(result, 1, 2);
-    });
-    fn2(1, 2, function(err, result) {
-        test.equal(result, 1, 2);
-        test.done();
-    });
-},
-
-    'custom hash function': function (test) {
-    test.expect(2);
-    var testerr = new Error('test');
-
-    var fn = function (arg1, arg2, callback) {
-        callback(testerr, arg1 + arg2);
-    };
-    var fn2 = async.memoize(fn, function () {
-        return 'custom hash';
-    });
-    fn2(1, 2, function (err, result) {
-        test.equal(result, 3);
-        fn2(2, 2, function (err, result) {
-            test.equal(result, 3);
-            test.done();
-        });
-    });
-},
-
-    'manually added memo value': function (test) {
-    test.expect(1);
-    var fn = async.memoize(function() {
-        test(false, "Function should never be called");
-    });
-    fn.memo["foo"] = ["bar"];
-    fn("foo", function(val) {
-        test.equal(val, "bar");
-        test.done();
-    });
-},
-
-    'avoid constructor key return undefined': function (test) {
-    test.expect(1);
-    var fn = async.memoize(function(name, callback) {
-        setTimeout(function(){
-            callback(null, name);
-        }, 100);
-    });
-    fn('constructor', function(error, results) {
-        test.equal(results, 'constructor');
-        test.done();
-    });
-},
-
-    'avoid __proto__ key return undefined': function (test) {
-    // Skip test if there is a Object.create bug (node 0.10 and some Chrome 30x versions)
-    var x = Object.create(null);
-    /* jshint proto: true */
-    x.__proto__ = 'foo';
-    if (x.__proto__ !== 'foo') {
-        return test.done();
-    }
-
-    test.expect(1);
-    var fn = async.memoize(function(name, callback) {
-        setTimeout(function(){
-            callback(null, name);
-        }, 100);
-    });
-    fn('__proto__', function(error, results) {
-        test.equal(results, '__proto__');
-        test.done();
-    });
-},
-
-    'allow hasOwnProperty as key': function (test) {
-    test.expect(1);
-    var fn = async.memoize(function(name, callback) {
-        setTimeout(function(){
-            callback(null, name);
-        }, 100);
-    });
-    fn('hasOwnProperty', function(error, results) {
-        test.equal(results, 'hasOwnProperty');
-        test.done();
-    });
-}
-
-};
-
-
-exports['ensureAsync'] = {
-    'defer sync functions': function (test) {
-        test.expect(6);
-        var sync = true;
-        async.ensureAsync(function (arg1, arg2, cb) {
-            test.equal(arg1, 1);
-            test.equal(arg2, 2);
-            cb(null, 4, 5);
-        })(1, 2, function (err, arg4, arg5) {
-            test.equal(err, null);
-            test.equal(arg4, 4);
-            test.equal(arg5, 5);
-            test.ok(!sync, 'callback called on same tick');
-            test.done();
-        });
-        sync = false;
-    },
-
-    'do not defer async functions': function (test) {
-        test.expect(6);
-        var sync = false;
-        async.ensureAsync(function (arg1, arg2, cb) {
-            test.equal(arg1, 1);
-            test.equal(arg2, 2);
-            async.setImmediate(function () {
-                sync = true;
-                cb(null, 4, 5);
-                sync = false;
-            });
-        })(1, 2, function (err, arg4, arg5) {
-            test.equal(err, null);
-            test.equal(arg4, 4);
-            test.equal(arg5, 5);
-            test.ok(sync, 'callback called on next tick');
-            test.done();
-        });
-    },
-
-    'double wrapping': function (test) {
-        test.expect(6);
-        var sync = true;
-        async.ensureAsync(async.ensureAsync(function (arg1, arg2, cb) {
-            test.equal(arg1, 1);
-            test.equal(arg2, 2);
-            cb(null, 4, 5);
-        }))(1, 2, function (err, arg4, arg5) {
-            test.equal(err, null);
-            test.equal(arg4, 4);
-            test.equal(arg5, 5);
-            test.ok(!sync, 'callback called on same tick');
-            test.done();
-        });
-        sync = false;
-    }
-};
-
-exports['constant'] = function (test) {
-    test.expect(5);
-    var f = async.constant(42, 1, 2, 3);
-    f(function (err, value, a, b, c) {
-        test.ok(!err);
-        test.ok(value === 42);
-        test.ok(a === 1);
-        test.ok(b === 2);
-        test.ok(c === 3);
-        test.done();
-    });
-};
-
-exports['asyncify'] = {
-    'asyncify': function (test) {
-        var parse = async.asyncify(JSON.parse);
-        parse("{\"a\":1}", function (err, result) {
-            test.ok(!err);
-            test.ok(result.a === 1);
-            test.done();
-        });
-    },
-
-    'asyncify null': function (test) {
-        var parse = async.asyncify(function() {
-            return null;
-        });
-        parse("{\"a\":1}", function (err, result) {
-            test.ok(!err);
-            test.ok(result === null);
-            test.done();
-        });
-    },
-
-    'variable numbers of arguments': function (test) {
-        async.asyncify(function (x, y, z) {
-            test.ok(arguments.length === 3);
-            test.ok(x === 1);
-            test.ok(y === 2);
-            test.ok(z === 3);
-        })(1, 2, 3, function () {});
-        test.done();
-    },
-
-    'catch errors': function (test) {
-        async.asyncify(function () {
-            throw new Error("foo");
-        })(function (err) {
-            test.ok(err);
-            test.ok(err.message === "foo");
-            test.done();
-        });
-    },
-
-    'dont catch errors in the callback': function (test) {
-        try {
-            async.asyncify(function () {})(function (err) {
-                if (err) {
-                    return test.done(new Error("should not get an error here"));
-                }
-                throw new Error("callback error");
-            });
-        } catch (e) {
-            test.ok(e.message === "callback error");
-            test.done();
-        }
-    },
-
-    'promisified': [
-        'native-promise-only',
-        'bluebird',
-        'es6-promise',
-        'rsvp'
-    ].reduce(function(promises, name) {
-        if (isBrowser()) {
-            // node only test
-            return;
-        }
-        var Promise = require(name);
-        if (typeof Promise.Promise === 'function') {
-            Promise = Promise.Promise;
-        }
-        promises[name] = {
-            'resolve': function(test) {
-                var promisified = function(argument) {
-                    return new Promise(function (resolve) {
-                        setTimeout(function () {
-                            resolve(argument + " resolved");
-                        }, 15);
-                    });
-                };
-                async.asyncify(promisified)("argument", function (err, value) {
-                    if (err) {
-                        return test.done(new Error("should not get an error here"));
-                    }
-                    test.ok(value === "argument resolved");
-                    test.done();
-                });
-            },
-
-            'reject': function(test) {
-                var promisified = function(argument) {
-                    return new Promise(function (resolve, reject) {
-                        reject(argument + " rejected");
-                    });
-                };
-                async.asyncify(promisified)("argument", function (err) {
-                    test.ok(err);
-                    test.ok(err.message === "argument rejected");
-                    test.done();
-                });
-            }
-        };
-        return promises;
-    }, {})
-};
-
-exports['timeout'] = function (test) {
-    test.expect(4);
-
-    async.series([
-        async.timeout(function asyncFn(callback) {
-            setTimeout(function() {
-                callback(null, 'I didn\'t time out');
-            }, 50);
-        }, 200),
-        async.timeout(function asyncFn(callback) {
-            setTimeout(function() {
-                callback(null, 'I will time out');
-            }, 300);
-        }, 150)
-    ],
-    function(err, results) {
-        test.ok(err.message === 'Callback function "asyncFn" timed out.');
-        test.ok(err.code === 'ETIMEDOUT');
-        test.ok(err.info === undefined);
-        test.ok(results[0] === 'I didn\'t time out');
-        test.done();
-    });
-};
-
-exports['timeout with info'] = function (test) {
-    test.expect(4);
-
-    var info = { custom: 'info about callback' };
-    async.series([
-        async.timeout(function asyncFn(callback) {
-            setTimeout(function() {
-                callback(null, 'I didn\'t time out');
-            }, 50);
-        }, 200),
-        async.timeout(function asyncFn(callback) {
-            setTimeout(function() {
-                callback(null, 'I will time out');
-            }, 300);
-        }, 150, info)
-    ],
-    function(err, results) {
-        test.ok(err.message === 'Callback function "asyncFn" timed out.');
-        test.ok(err.code === 'ETIMEDOUT');
-        test.ok(err.info === info);
-        test.ok(results[0] === 'I didn\'t time out');
-        test.done();
-    });
-};
-
-exports['timeout with parallel'] = function (test) {
-    test.expect(4);
-
-    async.parallel([
-        async.timeout(function asyncFn(callback) {
-            setTimeout(function() {
-                callback(null, 'I didn\'t time out');
-            }, 50);
-        }, 200),
-        async.timeout(function asyncFn(callback) {
-            setTimeout(function() {
-                callback(null, 'I will time out');
-            }, 300);
-        }, 150)
-    ],
-    function(err, results) {
-        test.ok(err.message === 'Callback function "asyncFn" timed out.');
-        test.ok(err.code === 'ETIMEDOUT');
-        test.ok(err.info === undefined);
-        test.ok(results[0] === 'I didn\'t time out');
-        test.done();
-    });
-};
diff --git a/test/test.html b/test/test.html
deleted file mode 100644
index 0047af4..0000000
--- a/test/test.html
+++ /dev/null
@@ -1,24 +0,0 @@
-<html>
-  <head>
-    <title>Async.js Test Suite</title>
-    <!--
-      async must be included after nodeunit because nodeunit already uses
-      the async lib internally and will overwrite the version we want to test
-    -->
-    <script src="../deps/nodeunit.js"></script>
-    <script src="../dist/async.js"></script>
-    <link rel="stylesheet" href="../deps/nodeunit.css" type="text/css" media="screen" />
-    <script>
-      var _async = this.async;
-      this.require = function () { return _async; };
-      this.exports = {};
-    </script>
-    <script src="test-async.js"></script>
-  </head>
-  <body>
-    <h1 id="nodeunit-header">Async.js Test Suite</h1>
-    <script>
-      nodeunit.run({'test-async': exports});
-    </script>
-  </body>
-</html>