update built files

3 files changed, 3759 insertions, 2427 deletions

diff --git a/dist/async.js b/dist/async.js
index 0032ce5..ff7031e 100644
--- a/dist/async.js
+++ b/dist/async.js
@@ -1,2563 +1,3895 @@
 (function (global, factory) {
-  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-  typeof define === 'function' && define.amd ? define(['exports'], factory) :
-  (factory((global.async = {})));
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (factory((global.async = global.async || {})));
 }(this, function (exports) { 'use strict';
 
-  /**
-   * A faster alternative to `Function#apply`, this function invokes `func`
-   * with the `this` binding of `thisArg` and the arguments of `args`.
-   *
-   * @private
-   * @param {Function} func The function to invoke.
-   * @param {*} thisArg The `this` binding of `func`.
-   * @param {...*} args The arguments to invoke `func` with.
-   * @returns {*} Returns the result of `func`.
-   */
-  function apply$1(func, thisArg, args) {
-    var length = args.length;
-    switch (length) {
-      case 0: return func.call(thisArg);
-      case 1: return func.call(thisArg, args[0]);
-      case 2: return func.call(thisArg, args[0], args[1]);
-      case 3: return func.call(thisArg, args[0], args[1], args[2]);
-    }
-    return func.apply(thisArg, args);
-  }
-
-  /**
-   * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
-   * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is an object, else `false`.
-   * @example
-   *
-   * _.isObject({});
-   * // => true
-   *
-   * _.isObject([1, 2, 3]);
-   * // => true
-   *
-   * _.isObject(_.noop);
-   * // => true
-   *
-   * _.isObject(null);
-   * // => false
-   */
-  function isObject(value) {
-    var type = typeof value;
-    return !!value && (type == 'object' || type == 'function');
-  }
-
-  var funcTag = '[object Function]';
-  var genTag = '[object GeneratorFunction]';
-  /** Used for built-in method references. */
-  var objectProto$4 = Object.prototype;
-
-  /**
-   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
-   * of values.
-   */
-  var objectToString$2 = objectProto$4.toString;
-
-  /**
-   * Checks if `value` is classified as a `Function` object.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isFunction(_);
-   * // => true
-   *
-   * _.isFunction(/abc/);
-   * // => false
-   */
-  function isFunction(value) {
-    // The use of `Object#toString` avoids issues with the `typeof` operator
-    // in Safari 8 which returns 'object' for typed array constructors, and
-    // PhantomJS 1.9 which returns 'function' for `NodeList` instances.
-    var tag = isObject(value) ? objectToString$2.call(value) : '';
-    return tag == funcTag || tag == genTag;
-  }
-
-  /** Used as references for various `Number` constants. */
-  var NAN = 0 / 0;
-
-  /** Used to match leading and trailing whitespace. */
-  var reTrim = /^\s+|\s+$/g;
-
-  /** Used to detect bad signed hexadecimal string values. */
-  var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
-
-  /** Used to detect binary string values. */
-  var reIsBinary = /^0b[01]+$/i;
-
-  /** Used to detect octal string values. */
-  var reIsOctal = /^0o[0-7]+$/i;
-
-  /** Built-in method references without a dependency on `root`. */
-  var freeParseInt = parseInt;
-
-  /**
-   * Converts `value` to a number.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to process.
-   * @returns {number} Returns the number.
-   * @example
-   *
-   * _.toNumber(3);
-   * // => 3
-   *
-   * _.toNumber(Number.MIN_VALUE);
-   * // => 5e-324
-   *
-   * _.toNumber(Infinity);
-   * // => Infinity
-   *
-   * _.toNumber('3');
-   * // => 3
-   */
-  function toNumber(value) {
-    if (isObject(value)) {
-      var other = isFunction(value.valueOf) ? value.valueOf() : value;
-      value = isObject(other) ? (other + '') : other;
-    }
-    if (typeof value != 'string') {
-      return value === 0 ? value : +value;
-    }
-    value = value.replace(reTrim, '');
-    var isBinary = reIsBinary.test(value);
-    return (isBinary || reIsOctal.test(value))
-      ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
-      : (reIsBadHex.test(value) ? NAN : +value);
-  }
-
-  var INFINITY = 1 / 0;
-  var MAX_INTEGER = 1.7976931348623157e+308;
-  /**
-   * Converts `value` to an integer.
-   *
-   * **Note:** This function is loosely based on [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to convert.
-   * @returns {number} Returns the converted integer.
-   * @example
-   *
-   * _.toInteger(3);
-   * // => 3
-   *
-   * _.toInteger(Number.MIN_VALUE);
-   * // => 0
-   *
-   * _.toInteger(Infinity);
-   * // => 1.7976931348623157e+308
-   *
-   * _.toInteger('3');
-   * // => 3
-   */
-  function toInteger(value) {
-    if (!value) {
-      return value === 0 ? value : 0;
-    }
-    value = toNumber(value);
-    if (value === INFINITY || value === -INFINITY) {
-      var sign = (value < 0 ? -1 : 1);
-      return sign * MAX_INTEGER;
-    }
-    var remainder = value % 1;
-    return value === value ? (remainder ? value - remainder : value) : 0;
-  }
-
-  /** Used as the `TypeError` message for "Functions" methods. */
-  var FUNC_ERROR_TEXT = 'Expected a function';
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeMax = Math.max;
-
-  /**
-   * Creates a function that invokes `func` with the `this` binding of the
-   * created function and arguments from `start` and beyond provided as an array.
-   *
-   * **Note:** This method is based on the [rest parameter](https://mdn.io/rest_parameters).
-   *
-   * @static
-   * @memberOf _
-   * @category Function
-   * @param {Function} func The function to apply a rest parameter to.
-   * @param {number} [start=func.length-1] The start position of the rest parameter.
-   * @returns {Function} Returns the new function.
-   * @example
-   *
-   * var say = _.rest(function(what, names) {
-   *   return what + ' ' + _.initial(names).join(', ') +
-   *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
-   * });
-   *
-   * say('hello', 'fred', 'barney', 'pebbles');
-   * // => 'hello fred, barney, & pebbles'
-   */
-  function rest(func, start) {
-    if (typeof func != 'function') {
-      throw new TypeError(FUNC_ERROR_TEXT);
-    }
-    start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0);
-    return function() {
-      var args = arguments,
-          index = -1,
-          length = nativeMax(args.length - start, 0),
-          array = Array(length);
-
-      while (++index < length) {
-        array[index] = args[start + index];
+    /**
+     * A faster alternative to `Function#apply`, this function invokes `func`
+     * with the `this` binding of `thisArg` and the arguments of `args`.
+     *
+     * @private
+     * @param {Function} func The function to invoke.
+     * @param {*} thisArg The `this` binding of `func`.
+     * @param {...*} args The arguments to invoke `func` with.
+     * @returns {*} Returns the result of `func`.
+     */
+    function apply(func, thisArg, args) {
+      var length = args.length;
+      switch (length) {
+        case 0: return func.call(thisArg);
+        case 1: return func.call(thisArg, args[0]);
+        case 2: return func.call(thisArg, args[0], args[1]);
+        case 3: return func.call(thisArg, args[0], args[1], args[2]);
       }
-      switch (start) {
-        case 0: return func.call(this, array);
-        case 1: return func.call(this, args[0], array);
-        case 2: return func.call(this, args[0], args[1], array);
+      return func.apply(thisArg, args);
+    }
+
+    /**
+     * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
+     * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an object, else `false`.
+     * @example
+     *
+     * _.isObject({});
+     * // => true
+     *
+     * _.isObject([1, 2, 3]);
+     * // => true
+     *
+     * _.isObject(_.noop);
+     * // => true
+     *
+     * _.isObject(null);
+     * // => false
+     */
+    function isObject(value) {
+      var type = typeof value;
+      return !!value && (type == 'object' || type == 'function');
+    }
+
+    var funcTag = '[object Function]';
+    var genTag = '[object GeneratorFunction]';
+    /** Used for built-in method references. */
+    var objectProto = Object.prototype;
+
+    /**
+     * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+     * of values.
+     */
+    var objectToString = objectProto.toString;
+
+    /**
+     * Checks if `value` is classified as a `Function` object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isFunction(_);
+     * // => true
+     *
+     * _.isFunction(/abc/);
+     * // => false
+     */
+    function isFunction(value) {
+      // The use of `Object#toString` avoids issues with the `typeof` operator
+      // in Safari 8 which returns 'object' for typed array and weak map constructors,
+      // and PhantomJS 1.9 which returns 'function' for `NodeList` instances.
+      var tag = isObject(value) ? objectToString.call(value) : '';
+      return tag == funcTag || tag == genTag;
+    }
+
+    /** Used as references for various `Number` constants. */
+    var NAN = 0 / 0;
+
+    /** Used to match leading and trailing whitespace. */
+    var reTrim = /^\s+|\s+$/g;
+
+    /** Used to detect bad signed hexadecimal string values. */
+    var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
+
+    /** Used to detect binary string values. */
+    var reIsBinary = /^0b[01]+$/i;
+
+    /** Used to detect octal string values. */
+    var reIsOctal = /^0o[0-7]+$/i;
+
+    /** Built-in method references without a dependency on `root`. */
+    var freeParseInt = parseInt;
+
+    /**
+     * Converts `value` to a number.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to process.
+     * @returns {number} Returns the number.
+     * @example
+     *
+     * _.toNumber(3);
+     * // => 3
+     *
+     * _.toNumber(Number.MIN_VALUE);
+     * // => 5e-324
+     *
+     * _.toNumber(Infinity);
+     * // => Infinity
+     *
+     * _.toNumber('3');
+     * // => 3
+     */
+    function toNumber(value) {
+      if (isObject(value)) {
+        var other = isFunction(value.valueOf) ? value.valueOf() : value;
+        value = isObject(other) ? (other + '') : other;
       }
-      var otherArgs = Array(start + 1);
-      index = -1;
-      while (++index < start) {
-        otherArgs[index] = args[index];
+      if (typeof value != 'string') {
+        return value === 0 ? value : +value;
       }
-      otherArgs[start] = array;
-      return apply$1(func, this, otherArgs);
-    };
-  }
-
-  function applyEach$1(eachfn) {
-      return rest(function (fns, args) {
-          var go = rest(function (args) {
-              var that = this;
-              var callback = args.pop();
-              return eachfn(fns, function (fn, _, cb) {
-                  fn.apply(that, args.concat([cb]));
-              }, callback);
-          });
-          if (args.length) {
-              return go.apply(this, args);
-          } else {
-              return go;
-          }
-      });
-  }
-
-  /** Used as the `TypeError` message for "Functions" methods. */
-  var FUNC_ERROR_TEXT$1 = 'Expected a function';
-
-  /**
-   * Creates a function that invokes `func`, with the `this` binding and arguments
-   * of the created function, while it's called less than `n` times. Subsequent
-   * calls to the created function return the result of the last `func` invocation.
-   *
-   * @static
-   * @memberOf _
-   * @category Function
-   * @param {number} n The number of calls at which `func` is no longer invoked.
-   * @param {Function} func The function to restrict.
-   * @returns {Function} Returns the new restricted function.
-   * @example
-   *
-   * jQuery(element).on('click', _.before(5, addContactToList));
-   * // => allows adding up to 4 contacts to the list
-   */
-  function before(n, func) {
-    var result;
-    if (typeof func != 'function') {
-      throw new TypeError(FUNC_ERROR_TEXT$1);
-    }
-    n = toInteger(n);
-    return function() {
-      if (--n > 0) {
-        result = func.apply(this, arguments);
+      value = value.replace(reTrim, '');
+      var isBinary = reIsBinary.test(value);
+      return (isBinary || reIsOctal.test(value))
+        ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
+        : (reIsBadHex.test(value) ? NAN : +value);
+    }
+
+    var INFINITY = 1 / 0;
+    var MAX_INTEGER = 1.7976931348623157e+308;
+    /**
+     * Converts `value` to an integer.
+     *
+     * **Note:** This function is loosely based on [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to convert.
+     * @returns {number} Returns the converted integer.
+     * @example
+     *
+     * _.toInteger(3);
+     * // => 3
+     *
+     * _.toInteger(Number.MIN_VALUE);
+     * // => 0
+     *
+     * _.toInteger(Infinity);
+     * // => 1.7976931348623157e+308
+     *
+     * _.toInteger('3');
+     * // => 3
+     */
+    function toInteger(value) {
+      if (!value) {
+        return value === 0 ? value : 0;
       }
-      if (n <= 1) {
-        func = undefined;
+      value = toNumber(value);
+      if (value === INFINITY || value === -INFINITY) {
+        var sign = (value < 0 ? -1 : 1);
+        return sign * MAX_INTEGER;
       }
-      return result;
-    };
-  }
-
-  /**
-   * Creates a function that is restricted to invoking `func` once. Repeat calls
-   * to the function return the value of the first invocation. The `func` is
-   * invoked with the `this` binding and arguments of the created function.
-   *
-   * @static
-   * @memberOf _
-   * @category Function
-   * @param {Function} func The function to restrict.
-   * @returns {Function} Returns the new restricted function.
-   * @example
-   *
-   * var initialize = _.once(createApplication);
-   * initialize();
-   * initialize();
-   * // `initialize` invokes `createApplication` once
-   */
-  function once(func) {
-    return before(2, func);
-  }
-
-  /**
-   * A no-operation function that returns `undefined` regardless of the
-   * arguments it receives.
-   *
-   * @static
-   * @memberOf _
-   * @category Util
-   * @example
-   *
-   * var object = { 'user': 'fred' };
-   *
-   * _.noop(object) === undefined;
-   * // => true
-   */
-  function noop() {
-    // No operation performed.
-  }
-
-  /**
-   * The base implementation of `_.property` without support for deep paths.
-   *
-   * @private
-   * @param {string} key The key of the property to get.
-   * @returns {Function} Returns the new function.
-   */
-  function baseProperty(key) {
-    return function(object) {
-      return object == null ? undefined : object[key];
-    };
-  }
-
-  /**
-   * Gets the "length" property value of `object`.
-   *
-   * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
-   * that affects Safari on at least iOS 8.1-8.3 ARM64.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @returns {*} Returns the "length" value.
-   */
-  var getLength = baseProperty('length');
-
-  /** Used as references for various `Number` constants. */
-  var MAX_SAFE_INTEGER$1 = 9007199254740991;
-
-  /**
-   * Checks if `value` is a valid array-like length.
-   *
-   * **Note:** This function is loosely based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
-   * @example
-   *
-   * _.isLength(3);
-   * // => true
-   *
-   * _.isLength(Number.MIN_VALUE);
-   * // => false
-   *
-   * _.isLength(Infinity);
-   * // => false
-   *
-   * _.isLength('3');
-   * // => false
-   */
-  function isLength(value) {
-    return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER$1;
-  }
-
-  /**
-   * Checks if `value` is array-like. A value is considered array-like if it's
-   * not a function and has a `value.length` that's an integer greater than or
-   * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
-   *
-   * @static
-   * @memberOf _
-   * @type Function
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
-   * @example
-   *
-   * _.isArrayLike([1, 2, 3]);
-   * // => true
-   *
-   * _.isArrayLike(document.body.children);
-   * // => true
-   *
-   * _.isArrayLike('abc');
-   * // => true
-   *
-   * _.isArrayLike(_.noop);
-   * // => false
-   */
-  function isArrayLike(value) {
-    return value != null &&
-      !(typeof value == 'function' && isFunction(value)) && isLength(getLength(value));
-  }
-
-  /** Used for built-in method references. */
-  var objectProto = Object.prototype;
-
-  /** Used to check objects for own properties. */
-  var hasOwnProperty = objectProto.hasOwnProperty;
-
-  /** Built-in value references. */
-  var getPrototypeOf = Object.getPrototypeOf;
-
-  /**
-   * The base implementation of `_.has` without support for deep paths.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @param {Array|string} key The key to check.
-   * @returns {boolean} Returns `true` if `key` exists, else `false`.
-   */
-  function baseHas(object, key) {
-    // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
-    // that are composed entirely of index properties, return `false` for
-    // `hasOwnProperty` checks of them.
-    return hasOwnProperty.call(object, key) ||
-      (typeof object == 'object' && key in object && getPrototypeOf(object) === null);
-  }
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeKeys = Object.keys;
-
-  /**
-   * The base implementation of `_.keys` which doesn't skip the constructor
-   * property of prototypes or treat sparse arrays as dense.
-   *
-   * @private
-   * @type Function
-   * @param {Object} object The object to query.
-   * @returns {Array} Returns the array of property names.
-   */
-  function baseKeys(object) {
-    return nativeKeys(Object(object));
-  }
-
-  /**
-   * The base implementation of `_.times` without support for iteratee shorthands
-   * or max array length checks.
-   *
-   * @private
-   * @param {number} n The number of times to invoke `iteratee`.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Array} Returns the array of results.
-   */
-  function baseTimes(n, iteratee) {
-    var index = -1,
-        result = Array(n);
-
-    while (++index < n) {
-      result[index] = iteratee(index);
-    }
-    return result;
-  }
-
-  /**
-   * Checks if `value` is object-like. A value is object-like if it's not `null`
-   * and has a `typeof` result of "object".
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
-   * @example
-   *
-   * _.isObjectLike({});
-   * // => true
-   *
-   * _.isObjectLike([1, 2, 3]);
-   * // => true
-   *
-   * _.isObjectLike(_.noop);
-   * // => false
-   *
-   * _.isObjectLike(null);
-   * // => false
-   */
-  function isObjectLike(value) {
-    return !!value && typeof value == 'object';
-  }
-
-  /**
-   * This method is like `_.isArrayLike` except that it also checks if `value`
-   * is an object.
-   *
-   * @static
-   * @memberOf _
-   * @type Function
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`.
-   * @example
-   *
-   * _.isArrayLikeObject([1, 2, 3]);
-   * // => true
-   *
-   * _.isArrayLikeObject(document.body.children);
-   * // => true
-   *
-   * _.isArrayLikeObject('abc');
-   * // => false
-   *
-   * _.isArrayLikeObject(_.noop);
-   * // => false
-   */
-  function isArrayLikeObject(value) {
-    return isObjectLike(value) && isArrayLike(value);
-  }
-
-  /** `Object#toString` result references. */
-  var argsTag = '[object Arguments]';
-
-  /** Used for built-in method references. */
-  var objectProto$2 = Object.prototype;
-
-  /** Used to check objects for own properties. */
-  var hasOwnProperty$1 = objectProto$2.hasOwnProperty;
-
-  /**
-   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
-   * of values.
-   */
-  var objectToString = objectProto$2.toString;
-
-  /** Built-in value references. */
-  var propertyIsEnumerable = objectProto$2.propertyIsEnumerable;
-
-  /**
-   * Checks if `value` is likely an `arguments` object.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isArguments(function() { return arguments; }());
-   * // => true
-   *
-   * _.isArguments([1, 2, 3]);
-   * // => false
-   */
-  function isArguments(value) {
-    // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
-    return isArrayLikeObject(value) && hasOwnProperty$1.call(value, 'callee') &&
-      (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
-  }
-
-  /**
-   * Checks if `value` is classified as an `Array` object.
-   *
-   * @static
-   * @memberOf _
-   * @type Function
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isArray([1, 2, 3]);
-   * // => true
-   *
-   * _.isArray(document.body.children);
-   * // => false
-   *
-   * _.isArray('abc');
-   * // => false
-   *
-   * _.isArray(_.noop);
-   * // => false
-   */
-  var isArray = Array.isArray;
-
-  /** `Object#toString` result references. */
-  var stringTag = '[object String]';
-
-  /** Used for built-in method references. */
-  var objectProto$3 = Object.prototype;
-
-  /**
-   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
-   * of values.
-   */
-  var objectToString$1 = objectProto$3.toString;
-
-  /**
-   * Checks if `value` is classified as a `String` primitive or object.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isString('abc');
-   * // => true
-   *
-   * _.isString(1);
-   * // => false
-   */
-  function isString(value) {
-    return typeof value == 'string' ||
-      (!isArray(value) && isObjectLike(value) && objectToString$1.call(value) == stringTag);
-  }
-
-  /**
-   * Creates an array of index keys for `object` values of arrays,
-   * `arguments` objects, and strings, otherwise `null` is returned.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @returns {Array|null} Returns index keys, else `null`.
-   */
-  function indexKeys(object) {
-    var length = object ? object.length : undefined;
-    if (isLength(length) &&
-        (isArray(object) || isString(object) || isArguments(object))) {
-      return baseTimes(length, String);
-    }
-    return null;
-  }
-
-  /** Used as references for various `Number` constants. */
-  var MAX_SAFE_INTEGER = 9007199254740991;
-
-  /** Used to detect unsigned integer values. */
-  var reIsUint = /^(?:0|[1-9]\d*)$/;
-
-  /**
-   * Checks if `value` is a valid array-like index.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
-   * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
-   */
-  function isIndex(value, length) {
-    value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
-    length = length == null ? MAX_SAFE_INTEGER : length;
-    return value > -1 && value % 1 == 0 && value < length;
-  }
-
-  /** Used for built-in method references. */
-  var objectProto$1 = Object.prototype;
-
-  /**
-   * Checks if `value` is likely a prototype object.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
-   */
-  function isPrototype(value) {
-    var Ctor = value && value.constructor,
-        proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$1;
-
-    return value === proto;
-  }
-
-  /**
-   * Creates an array of the own enumerable property names of `object`.
-   *
-   * **Note:** Non-object values are coerced to objects. See the
-   * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
-   * for more details.
-   *
-   * @static
-   * @memberOf _
-   * @category Object
-   * @param {Object} object The object to query.
-   * @returns {Array} Returns the array of property names.
-   * @example
-   *
-   * function Foo() {
-   *   this.a = 1;
-   *   this.b = 2;
-   * }
-   *
-   * Foo.prototype.c = 3;
-   *
-   * _.keys(new Foo);
-   * // => ['a', 'b'] (iteration order is not guaranteed)
-   *
-   * _.keys('hi');
-   * // => ['0', '1']
-   */
-  function keys(object) {
-    var isProto = isPrototype(object);
-    if (!(isProto || isArrayLike(object))) {
-      return baseKeys(object);
-    }
-    var indexes = indexKeys(object),
-        skipIndexes = !!indexes,
-        result = indexes || [],
-        length = result.length;
-
-    for (var key in object) {
-      if (baseHas(object, key) &&
-          !(skipIndexes && (key == 'length' || isIndex(key, length))) &&
-          !(isProto && key == 'constructor')) {
-        result.push(key);
+      var remainder = value % 1;
+      return value === value ? (remainder ? value - remainder : value) : 0;
+    }
+
+    /** Used as the `TypeError` message for "Functions" methods. */
+    var FUNC_ERROR_TEXT = 'Expected a function';
+
+    /* Built-in method references for those with the same name as other `lodash` methods. */
+    var nativeMax = Math.max;
+
+    /**
+     * Creates a function that invokes `func` with the `this` binding of the
+     * created function and arguments from `start` and beyond provided as an array.
+     *
+     * **Note:** This method is based on the [rest parameter](https://mdn.io/rest_parameters).
+     *
+     * @static
+     * @memberOf _
+     * @category Function
+     * @param {Function} func The function to apply a rest parameter to.
+     * @param {number} [start=func.length-1] The start position of the rest parameter.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var say = _.rest(function(what, names) {
+     *   return what + ' ' + _.initial(names).join(', ') +
+     *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
+     * });
+     *
+     * say('hello', 'fred', 'barney', 'pebbles');
+     * // => 'hello fred, barney, & pebbles'
+     */
+    function rest(func, start) {
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
       }
+      start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0);
+      return function() {
+        var args = arguments,
+            index = -1,
+            length = nativeMax(args.length - start, 0),
+            array = Array(length);
+
+        while (++index < length) {
+          array[index] = args[start + index];
+        }
+        switch (start) {
+          case 0: return func.call(this, array);
+          case 1: return func.call(this, args[0], array);
+          case 2: return func.call(this, args[0], args[1], array);
+        }
+        var otherArgs = Array(start + 1);
+        index = -1;
+        while (++index < start) {
+          otherArgs[index] = args[index];
+        }
+        otherArgs[start] = array;
+        return apply(func, this, otherArgs);
+      };
     }
-    return result;
-  }
-
-  function keyIterator(coll) {
-      var i = -1;
-      var len;
-      if (isArrayLike(coll)) {
-          len = coll.length;
-          return function next() {
-              i++;
-              return i < len ? i : null;
-          };
-      } else {
-          var okeys = keys(coll);
-          len = okeys.length;
-          return function next() {
-              i++;
-              return i < len ? okeys[i] : null;
-          };
+
+    function applyEach$1(eachfn) {
+        return rest(function (fns, args) {
+            var go = rest(function (args) {
+                var that = this;
+                var callback = args.pop();
+                return eachfn(fns, function (fn, _, cb) {
+                    fn.apply(that, args.concat([cb]));
+                }, callback);
+            });
+            if (args.length) {
+                return go.apply(this, args);
+            } else {
+                return go;
+            }
+        });
+    }
+
+    /**
+     * A no-operation function that returns `undefined` regardless of the
+     * arguments it receives.
+     *
+     * @static
+     * @memberOf _
+     * @category Util
+     * @example
+     *
+     * var object = { 'user': 'fred' };
+     *
+     * _.noop(object) === undefined;
+     * // => true
+     */
+    function noop() {
+      // No operation performed.
+    }
+
+    /** Used as the `TypeError` message for "Functions" methods. */
+    var FUNC_ERROR_TEXT$1 = 'Expected a function';
+
+    /**
+     * Creates a function that invokes `func`, with the `this` binding and arguments
+     * of the created function, while it's called less than `n` times. Subsequent
+     * calls to the created function return the result of the last `func` invocation.
+     *
+     * @static
+     * @memberOf _
+     * @category Function
+     * @param {number} n The number of calls at which `func` is no longer invoked.
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new restricted function.
+     * @example
+     *
+     * jQuery(element).on('click', _.before(5, addContactToList));
+     * // => allows adding up to 4 contacts to the list
+     */
+    function before(n, func) {
+      var result;
+      if (typeof func != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT$1);
       }
-  }
+      n = toInteger(n);
+      return function() {
+        if (--n > 0) {
+          result = func.apply(this, arguments);
+        }
+        if (n <= 1) {
+          func = undefined;
+        }
+        return result;
+      };
+    }
+
+    /**
+     * Creates a function that is restricted to invoking `func` once. Repeat calls
+     * to the function return the value of the first invocation. The `func` is
+     * invoked with the `this` binding and arguments of the created function.
+     *
+     * @static
+     * @memberOf _
+     * @category Function
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new restricted function.
+     * @example
+     *
+     * var initialize = _.once(createApplication);
+     * initialize();
+     * initialize();
+     * // `initialize` invokes `createApplication` once
+     */
+    function once(func) {
+      return before(2, func);
+    }
 
-  function onlyOnce(fn) {
-      return function () {
-          if (fn === null) throw new Error("Callback was already called.");
-          fn.apply(this, arguments);
-          fn = null;
+    /**
+     * The base implementation of `_.property` without support for deep paths.
+     *
+     * @private
+     * @param {string} key The key of the property to get.
+     * @returns {Function} Returns the new function.
+     */
+    function baseProperty(key) {
+      return function(object) {
+        return object == null ? undefined : object[key];
       };
-  }
+    }
 
-  function eachOf(object, iterator, callback) {
-      callback = once(callback || noop);
-      object = object || [];
+    /**
+     * Gets the "length" property value of `object`.
+     *
+     * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
+     * that affects Safari on at least iOS 8.1-8.3 ARM64.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {*} Returns the "length" value.
+     */
+    var getLength = baseProperty('length');
+
+    /** Used as references for various `Number` constants. */
+    var MAX_SAFE_INTEGER = 9007199254740991;
+
+    /**
+     * Checks if `value` is a valid array-like length.
+     *
+     * **Note:** This function is loosely based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+     * @example
+     *
+     * _.isLength(3);
+     * // => true
+     *
+     * _.isLength(Number.MIN_VALUE);
+     * // => false
+     *
+     * _.isLength(Infinity);
+     * // => false
+     *
+     * _.isLength('3');
+     * // => false
+     */
+    function isLength(value) {
+      return typeof value == 'number' &&
+        value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+    }
 
-      var iter = keyIterator(object);
-      var key,
-          completed = 0;
+    /**
+     * Checks if `value` is array-like. A value is considered array-like if it's
+     * not a function and has a `value.length` that's an integer greater than or
+     * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
+     * @example
+     *
+     * _.isArrayLike([1, 2, 3]);
+     * // => true
+     *
+     * _.isArrayLike(document.body.children);
+     * // => true
+     *
+     * _.isArrayLike('abc');
+     * // => true
+     *
+     * _.isArrayLike(_.noop);
+     * // => false
+     */
+    function isArrayLike(value) {
+      return value != null && isLength(getLength(value)) && !isFunction(value);
+    }
+
+    /** Used for built-in method references. */
+    var objectProto$1 = Object.prototype;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty = objectProto$1.hasOwnProperty;
+
+    /** Built-in value references. */
+    var getPrototypeOf = Object.getPrototypeOf;
+
+    /**
+     * The base implementation of `_.has` without support for deep paths.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array|string} key The key to check.
+     * @returns {boolean} Returns `true` if `key` exists, else `false`.
+     */
+    function baseHas(object, key) {
+      // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
+      // that are composed entirely of index properties, return `false` for
+      // `hasOwnProperty` checks of them.
+      return hasOwnProperty.call(object, key) ||
+        (typeof object == 'object' && key in object && getPrototypeOf(object) === null);
+    }
+
+    /* Built-in method references for those with the same name as other `lodash` methods. */
+    var nativeKeys = Object.keys;
+
+    /**
+     * The base implementation of `_.keys` which doesn't skip the constructor
+     * property of prototypes or treat sparse arrays as dense.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names.
+     */
+    function baseKeys(object) {
+      return nativeKeys(Object(object));
+    }
+
+    /**
+     * The base implementation of `_.times` without support for iteratee shorthands
+     * or max array length checks.
+     *
+     * @private
+     * @param {number} n The number of times to invoke `iteratee`.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Array} Returns the array of results.
+     */
+    function baseTimes(n, iteratee) {
+      var index = -1,
+          result = Array(n);
 
-      while ((key = iter()) != null) {
-          completed += 1;
-          iterator(object[key], key, onlyOnce(done));
+      while (++index < n) {
+        result[index] = iteratee(index);
       }
+      return result;
+    }
 
-      if (completed === 0) callback(null);
+    /**
+     * Checks if `value` is object-like. A value is object-like if it's not `null`
+     * and has a `typeof` result of "object".
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
+     * @example
+     *
+     * _.isObjectLike({});
+     * // => true
+     *
+     * _.isObjectLike([1, 2, 3]);
+     * // => true
+     *
+     * _.isObjectLike(_.noop);
+     * // => false
+     *
+     * _.isObjectLike(null);
+     * // => false
+     */
+    function isObjectLike(value) {
+      return !!value && typeof value == 'object';
+    }
 
-      function done(err) {
-          completed--;
-          if (err) {
-              callback(err);
-          }
-          // Check key is null in case iterator isn't exhausted
-          // and done resolved synchronously.
-          else if (key === null && completed <= 0) {
-                  callback(null);
-              }
+    /**
+     * This method is like `_.isArrayLike` except that it also checks if `value`
+     * is an object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`.
+     * @example
+     *
+     * _.isArrayLikeObject([1, 2, 3]);
+     * // => true
+     *
+     * _.isArrayLikeObject(document.body.children);
+     * // => true
+     *
+     * _.isArrayLikeObject('abc');
+     * // => false
+     *
+     * _.isArrayLikeObject(_.noop);
+     * // => false
+     */
+    function isArrayLikeObject(value) {
+      return isObjectLike(value) && isArrayLike(value);
+    }
+
+    /** `Object#toString` result references. */
+    var argsTag = '[object Arguments]';
+
+    /** Used for built-in method references. */
+    var objectProto$2 = Object.prototype;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty$1 = objectProto$2.hasOwnProperty;
+
+    /**
+     * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+     * of values.
+     */
+    var objectToString$1 = objectProto$2.toString;
+
+    /** Built-in value references. */
+    var propertyIsEnumerable = objectProto$2.propertyIsEnumerable;
+
+    /**
+     * Checks if `value` is likely an `arguments` object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isArguments(function() { return arguments; }());
+     * // => true
+     *
+     * _.isArguments([1, 2, 3]);
+     * // => false
+     */
+    function isArguments(value) {
+      // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
+      return isArrayLikeObject(value) && hasOwnProperty$1.call(value, 'callee') &&
+        (!propertyIsEnumerable.call(value, 'callee') || objectToString$1.call(value) == argsTag);
+    }
+
+    /**
+     * Checks if `value` is classified as an `Array` object.
+     *
+     * @static
+     * @memberOf _
+     * @type {Function}
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isArray([1, 2, 3]);
+     * // => true
+     *
+     * _.isArray(document.body.children);
+     * // => false
+     *
+     * _.isArray('abc');
+     * // => false
+     *
+     * _.isArray(_.noop);
+     * // => false
+     */
+    var isArray = Array.isArray;
+
+    /** `Object#toString` result references. */
+    var stringTag = '[object String]';
+
+    /** Used for built-in method references. */
+    var objectProto$3 = Object.prototype;
+
+    /**
+     * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+     * of values.
+     */
+    var objectToString$2 = objectProto$3.toString;
+
+    /**
+     * Checks if `value` is classified as a `String` primitive or object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isString('abc');
+     * // => true
+     *
+     * _.isString(1);
+     * // => false
+     */
+    function isString(value) {
+      return typeof value == 'string' ||
+        (!isArray(value) && isObjectLike(value) && objectToString$2.call(value) == stringTag);
+    }
+
+    /**
+     * Creates an array of index keys for `object` values of arrays,
+     * `arguments` objects, and strings, otherwise `null` is returned.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array|null} Returns index keys, else `null`.
+     */
+    function indexKeys(object) {
+      var length = object ? object.length : undefined;
+      if (isLength(length) &&
+          (isArray(object) || isString(object) || isArguments(object))) {
+        return baseTimes(length, String);
       }
-  }
+      return null;
+    }
 
-  var applyEach = applyEach$1(eachOf);
+    /** Used as references for various `Number` constants. */
+    var MAX_SAFE_INTEGER$1 = 9007199254740991;
+
+    /** Used to detect unsigned integer values. */
+    var reIsUint = /^(?:0|[1-9]\d*)$/;
+
+    /**
+     * Checks if `value` is a valid array-like index.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+     * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
+     */
+    function isIndex(value, length) {
+      value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
+      length = length == null ? MAX_SAFE_INTEGER$1 : length;
+      return value > -1 && value % 1 == 0 && value < length;
+    }
 
-  var _setImmediate = typeof setImmediate === 'function' && setImmediate;
+    /** Used for built-in method references. */
+    var objectProto$4 = Object.prototype;
+
+    /**
+     * Checks if `value` is likely a prototype object.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
+     */
+    function isPrototype(value) {
+      var Ctor = value && value.constructor,
+          proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$4;
+
+      return value === proto;
+    }
 
-  var _delay;
-  if (_setImmediate) {
-      _delay = function (fn) {
-          // not a direct alias for IE10 compatibility
-          _setImmediate(fn);
-      };
-  } else if (typeof process === 'object' && typeof process.nextTick === 'function') {
-      _delay = process.nextTick;
-  } else {
-      _delay = function (fn) {
-          setTimeout(fn, 0);
-      };
-  }
+    /**
+     * Creates an array of the own enumerable property names of `object`.
+     *
+     * **Note:** Non-object values are coerced to objects. See the
+     * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
+     * for more details.
+     *
+     * @static
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of property names.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.keys(new Foo);
+     * // => ['a', 'b'] (iteration order is not guaranteed)
+     *
+     * _.keys('hi');
+     * // => ['0', '1']
+     */
+    function keys(object) {
+      var isProto = isPrototype(object);
+      if (!(isProto || isArrayLike(object))) {
+        return baseKeys(object);
+      }
+      var indexes = indexKeys(object),
+          skipIndexes = !!indexes,
+          result = indexes || [],
+          length = result.length;
+
+      for (var key in object) {
+        if (baseHas(object, key) &&
+            !(skipIndexes && (key == 'length' || isIndex(key, length))) &&
+            !(isProto && key == 'constructor')) {
+          result.push(key);
+        }
+      }
+      return result;
+    }
 
-  var setImmediate$1 = _delay;
+    function keyIterator(coll) {
+        var i = -1;
+        var len;
+        if (isArrayLike(coll)) {
+            len = coll.length;
+            return function next() {
+                i++;
+                return i < len ? i : null;
+            };
+        } else {
+            var okeys = keys(coll);
+            len = okeys.length;
+            return function next() {
+                i++;
+                return i < len ? okeys[i] : null;
+            };
+        }
+    }
 
-  function eachOfSeries(obj, iterator, callback) {
-      callback = once(callback || noop);
-      obj = obj || [];
-      var nextKey = keyIterator(obj);
-      var key = nextKey();
+    function onlyOnce(fn) {
+        return function () {
+            if (fn === null) throw new Error("Callback was already called.");
+            fn.apply(this, arguments);
+            fn = null;
+        };
+    }
 
-      function iterate() {
-          var sync = true;
-          if (key === null) {
-              return callback(null);
-          }
-          iterator(obj[key], key, onlyOnce(function (err) {
-              if (err) {
-                  callback(err);
-              } else {
-                  key = nextKey();
-                  if (key === null) {
-                      return callback(null);
-                  } else {
-                      if (sync) {
-                          setImmediate$1(iterate);
-                      } else {
-                          iterate();
-                      }
-                  }
-              }
-          }));
-          sync = false;
+    function _eachOfLimit(limit) {
+        return function (obj, iterator, callback) {
+            callback = once(callback || noop);
+            obj = obj || [];
+            var nextKey = keyIterator(obj);
+            if (limit <= 0) {
+                return callback(null);
+            }
+            var done = false;
+            var running = 0;
+            var errored = false;
+
+            (function replenish() {
+                if (done && running <= 0) {
+                    return callback(null);
+                }
+
+                while (running < limit && !errored) {
+                    var key = nextKey();
+                    if (key === null) {
+                        done = true;
+                        if (running <= 0) {
+                            callback(null);
+                        }
+                        return;
+                    }
+                    running += 1;
+                    iterator(obj[key], key, onlyOnce(function (err) {
+                        running -= 1;
+                        if (err) {
+                            callback(err);
+                            errored = true;
+                        } else {
+                            replenish();
+                        }
+                    }));
+                }
+            })();
+        };
+    }
+
+    function eachOfLimit(obj, limit, iterator, cb) {
+        _eachOfLimit(limit)(obj, iterator, cb);
+    }
+
+    function doLimit(fn, limit) {
+        return function (iterable, iterator, callback) {
+            return fn(iterable, limit, iterator, callback);
+        };
+    }
+
+    var eachOf = doLimit(eachOfLimit, Infinity);
+
+    var applyEach = applyEach$1(eachOf);
+
+    var eachOfSeries = doLimit(eachOfLimit, 1);
+
+    var applyEachSeries = applyEach$1(eachOfSeries);
+
+    var apply$1 = rest(function (fn, args) {
+        return rest(function (callArgs) {
+            return fn.apply(null, args.concat(callArgs));
+        });
+    });
+
+    function asyncify(func) {
+        return rest(function (args) {
+            var callback = args.pop();
+            var result;
+            try {
+                result = func.apply(this, args);
+            } catch (e) {
+                return callback(e);
+            }
+            // if result is Promise object
+            if (isObject(result) && typeof result.then === 'function') {
+                result.then(function (value) {
+                    callback(null, value);
+                })['catch'](function (err) {
+                    callback(err.message ? err : new Error(err));
+                });
+            } else {
+                callback(null, result);
+            }
+        });
+    }
+
+    /**
+     * A specialized version of `_.forEach` for arrays without support for
+     * iteratee shorthands.
+     *
+     * @private
+     * @param {Array} array The array to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Array} Returns `array`.
+     */
+    function arrayEach(array, iteratee) {
+      var index = -1,
+          length = array.length;
+
+      while (++index < length) {
+        if (iteratee(array[index], index, array) === false) {
+          break;
+        }
       }
-      iterate();
-  }
+      return array;
+    }
 
-  var applyEachSeries = applyEach$1(eachOfSeries);
+    /**
+     * This method returns the first argument given to it.
+     *
+     * @static
+     * @memberOf _
+     * @category Util
+     * @param {*} value Any value.
+     * @returns {*} Returns `value`.
+     * @example
+     *
+     * var object = { 'user': 'fred' };
+     *
+     * _.identity(object) === object;
+     * // => true
+     */
+    function identity(value) {
+      return value;
+    }
 
-  var apply = rest(function (fn, args) {
-      return rest(function (callArgs) {
-          return fn.apply(null, args.concat(callArgs));
-      });
-  });
-
-  function asyncify(func) {
-      return rest(function (args) {
-          var callback = args.pop();
-          var result;
-          try {
-              result = func.apply(this, args);
-          } catch (e) {
-              return callback(e);
-          }
-          // if result is Promise object
-          if (isObject(result) && typeof result.then === 'function') {
-              result.then(function (value) {
-                  callback(null, value);
-              })['catch'](function (err) {
-                  callback(err.message ? err : new Error(err));
-              });
-          } else {
-              callback(null, result);
+    /**
+     * Casts `value` to `identity` if it's not a function.
+     *
+     * @private
+     * @param {*} value The value to inspect.
+     * @returns {Array} Returns the array-like object.
+     */
+    function baseCastFunction(value) {
+      return typeof value == 'function' ? value : identity;
+    }
+
+    /**
+     * Creates a base function for methods like `_.forIn`.
+     *
+     * @private
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Function} Returns the new base function.
+     */
+    function createBaseFor(fromRight) {
+      return function(object, iteratee, keysFunc) {
+        var index = -1,
+            iterable = Object(object),
+            props = keysFunc(object),
+            length = props.length;
+
+        while (length--) {
+          var key = props[fromRight ? length : ++index];
+          if (iteratee(iterable[key], key, iterable) === false) {
+            break;
           }
-      });
-  }
-
-  /**
-   * A specialized version of `_.forEach` for arrays without support for
-   * iteratee shorthands.
-   *
-   * @private
-   * @param {Array} array The array to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Array} Returns `array`.
-   */
-  function arrayEach(array, iteratee) {
-    var index = -1,
-        length = array.length;
-
-    while (++index < length) {
-      if (iteratee(array[index], index, array) === false) {
-        break;
+        }
+        return object;
+      };
+    }
+
+    /**
+     * The base implementation of `baseForIn` and `baseForOwn` which iterates
+     * over `object` properties returned by `keysFunc` invoking `iteratee` for
+     * each property. Iteratee functions may exit iteration early by explicitly
+     * returning `false`.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @param {Function} keysFunc The function to get the keys of `object`.
+     * @returns {Object} Returns `object`.
+     */
+    var baseFor = createBaseFor();
+
+    /**
+     * The base implementation of `_.forOwn` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Object} object The object to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     */
+    function baseForOwn(object, iteratee) {
+      return object && baseFor(object, iteratee, keys);
+    }
+
+    /**
+     * Iterates over own enumerable properties of an object invoking `iteratee`
+     * for each property. The iteratee is invoked with three arguments:
+     * (value, key, object). Iteratee functions may exit iteration early by
+     * explicitly returning `false`.
+     *
+     * @static
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Object} Returns `object`.
+     * @example
+     *
+     * function Foo() {
+     *   this.a = 1;
+     *   this.b = 2;
+     * }
+     *
+     * Foo.prototype.c = 3;
+     *
+     * _.forOwn(new Foo, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => logs 'a' then 'b' (iteration order is not guaranteed)
+     */
+    function forOwn(object, iteratee) {
+      return object && baseForOwn(object, baseCastFunction(iteratee));
+    }
+
+    /**
+     * Gets the index at which the first occurrence of `NaN` is found in `array`.
+     *
+     * @private
+     * @param {Array} array The array to search.
+     * @param {number} fromIndex The index to search from.
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {number} Returns the index of the matched `NaN`, else `-1`.
+     */
+    function indexOfNaN(array, fromIndex, fromRight) {
+      var length = array.length,
+          index = fromIndex + (fromRight ? 0 : -1);
+
+      while ((fromRight ? index-- : ++index < length)) {
+        var other = array[index];
+        if (other !== other) {
+          return index;
+        }
       }
+      return -1;
     }
-    return array;
-  }
-
-  /**
-   * A specialized version of `_.every` for arrays without support for
-   * iteratee shorthands.
-   *
-   * @private
-   * @param {Array} array The array to iterate over.
-   * @param {Function} predicate The function invoked per iteration.
-   * @returns {boolean} Returns `true` if all elements pass the predicate check, else `false`.
-   */
-  function arrayEvery(array, predicate) {
-    var index = -1,
-        length = array.length;
-
-    while (++index < length) {
-      if (!predicate(array[index], index, array)) {
-        return false;
+
+    /**
+     * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
+     *
+     * @private
+     * @param {Array} array The array to search.
+     * @param {*} value The value to search for.
+     * @param {number} fromIndex The index to search from.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     */
+    function baseIndexOf(array, value, fromIndex) {
+      if (value !== value) {
+        return indexOfNaN(array, fromIndex);
       }
+      var index = fromIndex - 1,
+          length = array.length;
+
+      while (++index < length) {
+        if (array[index] === value) {
+          return index;
+        }
+      }
+      return -1;
+    }
+
+    /* Built-in method references for those with the same name as other `lodash` methods. */
+    var nativeMax$1 = Math.max;
+
+    /**
+     * Gets the index at which the first occurrence of `value` is found in `array`
+     * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * for equality comparisons. If `fromIndex` is negative, it's used as the offset
+     * from the end of `array`.
+     *
+     * @static
+     * @memberOf _
+     * @category Array
+     * @param {Array} array The array to search.
+     * @param {*} value The value to search for.
+     * @param {number} [fromIndex=0] The index to search from.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     * @example
+     *
+     * _.indexOf([1, 2, 1, 2], 2);
+     * // => 1
+     *
+     * // Search from the `fromIndex`.
+     * _.indexOf([1, 2, 1, 2], 2, 2);
+     * // => 3
+     */
+    function indexOf(array, value, fromIndex) {
+      var length = array ? array.length : 0;
+      if (!length) {
+        return -1;
+      }
+      fromIndex = toInteger(fromIndex);
+      if (fromIndex < 0) {
+        fromIndex = nativeMax$1(length + fromIndex, 0);
+      }
+      return baseIndexOf(array, value, fromIndex);
     }
-    return true;
-  }
-
-  /**
-   * Creates a base function for methods like `_.forIn`.
-   *
-   * @private
-   * @param {boolean} [fromRight] Specify iterating from right to left.
-   * @returns {Function} Returns the new base function.
-   */
-  function createBaseFor(fromRight) {
-    return function(object, iteratee, keysFunc) {
+
+    function auto (tasks, concurrency, callback) {
+        if (typeof concurrency === 'function') {
+            // concurrency is optional, shift the args.
+            callback = concurrency;
+            concurrency = null;
+        }
+        callback = once(callback || noop);
+        var keys$$ = keys(tasks);
+        var numTasks = keys$$.length;
+        if (!numTasks) {
+            return callback(null);
+        }
+        if (!concurrency) {
+            concurrency = numTasks;
+        }
+
+        var results = {};
+        var runningTasks = 0;
+        var hasError = false;
+
+        var listeners = {};
+
+        var readyTasks = [];
+
+        forOwn(tasks, function (task, key) {
+            if (!isArray(task)) {
+                // no dependencies
+                enqueueTask(key, [task]);
+                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) {
+                        throw new Error('async.auto task `' + key + '`Has cyclic dependencies');
+                    }
+                }
+            }
+
+            arrayEach(dependencies, function (dependencyName) {
+                addListener(dependencyName, function () {
+                    remainingDependencies--;
+                    if (remainingDependencies === 0) {
+                        enqueueTask(key, task);
+                    }
+                });
+            });
+        });
+
+        processQueue();
+
+        function enqueueTask(key, task) {
+            readyTasks.push(function () {
+                runTask(key, task);
+            });
+        }
+
+        function processQueue() {
+            if (readyTasks.length === 0 && runningTasks === 0) {
+                return callback(null, results);
+            }
+            while (readyTasks.length && runningTasks < concurrency) {
+                var run = readyTasks.shift();
+                run();
+            }
+        }
+
+        function addListener(taskName, fn) {
+            var taskListeners = listeners[taskName];
+            if (!taskListeners) {
+                taskListeners = listeners[taskName] = [];
+            }
+
+            taskListeners.push(fn);
+        }
+
+        function taskComplete(taskName) {
+            var taskListeners = listeners[taskName] || [];
+            arrayEach(taskListeners, function (fn) {
+                fn();
+            });
+            processQueue();
+        }
+
+        function runTask(key, task) {
+            if (hasError) return;
+
+            var taskCallback = onlyOnce(rest(function (err, args) {
+                runningTasks--;
+                if (args.length <= 1) {
+                    args = args[0];
+                }
+                if (err) {
+                    var safeResults = {};
+                    forOwn(results, function (val, rkey) {
+                        safeResults[rkey] = val;
+                    });
+                    safeResults[key] = args;
+                    hasError = true;
+                    listeners = [];
+
+                    callback(err, safeResults);
+                } else {
+                    results[key] = args;
+                    taskComplete(key);
+                }
+            }));
+
+            runningTasks++;
+            var taskFn = task[task.length - 1];
+            if (task.length > 1) {
+                taskFn(results, taskCallback);
+            } else {
+                taskFn(taskCallback);
+            }
+        }
+    }
+
+    /**
+     * A specialized version of `_.map` for arrays without support for iteratee
+     * shorthands.
+     *
+     * @private
+     * @param {Array} array The array to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Array} Returns the new mapped array.
+     */
+    function arrayMap(array, iteratee) {
       var index = -1,
-          iterable = Object(object),
-          props = keysFunc(object),
-          length = props.length;
+          length = array.length,
+          result = Array(length);
 
+      while (++index < length) {
+        result[index] = iteratee(array[index], index, array);
+      }
+      return result;
+    }
+
+    /**
+     * Removes all key-value entries from the stack.
+     *
+     * @private
+     * @name clear
+     * @memberOf Stack
+     */
+    function stackClear() {
+      this.__data__ = { 'array': [], 'map': null };
+    }
+
+    /**
+     * Performs a [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * comparison between two values to determine if they are equivalent.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to compare.
+     * @param {*} other The other value to compare.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+     * @example
+     *
+     * var object = { 'user': 'fred' };
+     * var other = { 'user': 'fred' };
+     *
+     * _.eq(object, object);
+     * // => true
+     *
+     * _.eq(object, other);
+     * // => false
+     *
+     * _.eq('a', 'a');
+     * // => true
+     *
+     * _.eq('a', Object('a'));
+     * // => false
+     *
+     * _.eq(NaN, NaN);
+     * // => true
+     */
+    function eq(value, other) {
+      return value === other || (value !== value && other !== other);
+    }
+
+    /**
+     * Gets the index at which the first occurrence of `key` is found in `array`
+     * of key-value pairs.
+     *
+     * @private
+     * @param {Array} array The array to search.
+     * @param {*} key The key to search for.
+     * @returns {number} Returns the index of the matched value, else `-1`.
+     */
+    function assocIndexOf(array, key) {
+      var length = array.length;
       while (length--) {
-        var key = props[fromRight ? length : ++index];
-        if (iteratee(iterable[key], key, iterable) === false) {
-          break;
+        if (eq(array[length][0], key)) {
+          return length;
         }
       }
-      return object;
-    };
-  }
-
-  /**
-   * The base implementation of `baseForIn` and `baseForOwn` which iterates
-   * over `object` properties returned by `keysFunc` invoking `iteratee` for
-   * each property. Iteratee functions may exit iteration early by explicitly
-   * returning `false`.
-   *
-   * @private
-   * @param {Object} object The object to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @param {Function} keysFunc The function to get the keys of `object`.
-   * @returns {Object} Returns `object`.
-   */
-  var baseFor = createBaseFor();
-
-  /**
-   * The base implementation of `_.forOwn` without support for iteratee shorthands.
-   *
-   * @private
-   * @param {Object} object The object to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Object} Returns `object`.
-   */
-  function baseForOwn(object, iteratee) {
-    return object && baseFor(object, iteratee, keys);
-  }
-
-  /**
-   * This method returns the first argument given to it.
-   *
-   * @static
-   * @memberOf _
-   * @category Util
-   * @param {*} value Any value.
-   * @returns {*} Returns `value`.
-   * @example
-   *
-   * var object = { 'user': 'fred' };
-   *
-   * _.identity(object) === object;
-   * // => true
-   */
-  function identity(value) {
-    return value;
-  }
-
-  /**
-   * Converts `value` to a function if it's not one.
-   *
-   * @private
-   * @param {*} value The value to process.
-   * @returns {Function} Returns the function.
-   */
-  function toFunction(value) {
-    return typeof value == 'function' ? value : identity;
-  }
-
-  /**
-   * Iterates over own enumerable properties of an object invoking `iteratee`
-   * for each property. The iteratee is invoked with three arguments:
-   * (value, key, object). Iteratee functions may exit iteration early by
-   * explicitly returning `false`.
-   *
-   * @static
-   * @memberOf _
-   * @category Object
-   * @param {Object} object The object to iterate over.
-   * @param {Function} [iteratee=_.identity] The function invoked per iteration.
-   * @returns {Object} Returns `object`.
-   * @example
-   *
-   * function Foo() {
-   *   this.a = 1;
-   *   this.b = 2;
-   * }
-   *
-   * Foo.prototype.c = 3;
-   *
-   * _.forOwn(new Foo, function(value, key) {
-   *   console.log(key);
-   * });
-   * // => logs 'a' then 'b' (iteration order is not guaranteed)
-   */
-  function forOwn(object, iteratee) {
-    return object && baseForOwn(object, toFunction(iteratee));
-  }
-
-  /**
-   * Gets the index at which the first occurrence of `NaN` is found in `array`.
-   *
-   * @private
-   * @param {Array} array The array to search.
-   * @param {number} fromIndex The index to search from.
-   * @param {boolean} [fromRight] Specify iterating from right to left.
-   * @returns {number} Returns the index of the matched `NaN`, else `-1`.
-   */
-  function indexOfNaN(array, fromIndex, fromRight) {
-    var length = array.length,
-        index = fromIndex + (fromRight ? 0 : -1);
-
-    while ((fromRight ? index-- : ++index < length)) {
-      var other = array[index];
-      if (other !== other) {
-        return index;
+      return -1;
+    }
+
+    /** Used for built-in method references. */
+    var arrayProto = Array.prototype;
+
+    /** Built-in value references. */
+    var splice = arrayProto.splice;
+
+    /**
+     * Removes `key` and its value from the associative array.
+     *
+     * @private
+     * @param {Array} array The array to query.
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function assocDelete(array, key) {
+      var index = assocIndexOf(array, key);
+      if (index < 0) {
+        return false;
+      }
+      var lastIndex = array.length - 1;
+      if (index == lastIndex) {
+        array.pop();
+      } else {
+        splice.call(array, index, 1);
       }
+      return true;
     }
-    return -1;
-  }
-
-  /**
-   * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
-   *
-   * @private
-   * @param {Array} array The array to search.
-   * @param {*} value The value to search for.
-   * @param {number} fromIndex The index to search from.
-   * @returns {number} Returns the index of the matched value, else `-1`.
-   */
-  function baseIndexOf(array, value, fromIndex) {
-    if (value !== value) {
-      return indexOfNaN(array, fromIndex);
-    }
-    var index = fromIndex - 1,
-        length = array.length;
-
-    while (++index < length) {
-      if (array[index] === value) {
-        return index;
+
+    /**
+     * Removes `key` and its value from the stack.
+     *
+     * @private
+     * @name delete
+     * @memberOf Stack
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function stackDelete(key) {
+      var data = this.__data__,
+          array = data.array;
+
+      return array ? assocDelete(array, key) : data.map['delete'](key);
+    }
+
+    /**
+     * Gets the associative array value for `key`.
+     *
+     * @private
+     * @param {Array} array The array to query.
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function assocGet(array, key) {
+      var index = assocIndexOf(array, key);
+      return index < 0 ? undefined : array[index][1];
+    }
+
+    /**
+     * Gets the stack value for `key`.
+     *
+     * @private
+     * @name get
+     * @memberOf Stack
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function stackGet(key) {
+      var data = this.__data__,
+          array = data.array;
+
+      return array ? assocGet(array, key) : data.map.get(key);
+    }
+
+    /**
+     * Checks if an associative array value for `key` exists.
+     *
+     * @private
+     * @param {Array} array The array to query.
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function assocHas(array, key) {
+      return assocIndexOf(array, key) > -1;
+    }
+
+    /**
+     * Checks if a stack value for `key` exists.
+     *
+     * @private
+     * @name has
+     * @memberOf Stack
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function stackHas(key) {
+      var data = this.__data__,
+          array = data.array;
+
+      return array ? assocHas(array, key) : data.map.has(key);
+    }
+
+    /**
+     * Checks if `value` is a host object in IE < 9.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
+     */
+    function isHostObject(value) {
+      // Many host objects are `Object` objects that can coerce to strings
+      // despite having improperly defined `toString` methods.
+      var result = false;
+      if (value != null && typeof value.toString != 'function') {
+        try {
+          result = !!(value + '');
+        } catch (e) {}
       }
+      return result;
     }
-    return -1;
-  }
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeMax$1 = Math.max;
-
-  /**
-   * Gets the index at which the first occurrence of `value` is found in `array`
-   * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
-   * for equality comparisons. If `fromIndex` is negative, it's used as the offset
-   * from the end of `array`.
-   *
-   * @static
-   * @memberOf _
-   * @category Array
-   * @param {Array} array The array to search.
-   * @param {*} value The value to search for.
-   * @param {number} [fromIndex=0] The index to search from.
-   * @returns {number} Returns the index of the matched value, else `-1`.
-   * @example
-   *
-   * _.indexOf([1, 2, 1, 2], 2);
-   * // => 1
-   *
-   * // Search from the `fromIndex`.
-   * _.indexOf([1, 2, 1, 2], 2, 2);
-   * // => 3
-   */
-  function indexOf(array, value, fromIndex) {
-    var length = array ? array.length : 0;
-    if (!length) {
-      return -1;
+
+    /** Used to match `RegExp` [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns). */
+    var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
+
+    /** Used to detect host constructors (Safari > 5). */
+    var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+    /** Used for built-in method references. */
+    var objectProto$6 = Object.prototype;
+
+    /** Used to resolve the decompiled source of functions. */
+    var funcToString = Function.prototype.toString;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty$2 = objectProto$6.hasOwnProperty;
+
+    /** Used to detect if a method is native. */
+    var reIsNative = RegExp('^' +
+      funcToString.call(hasOwnProperty$2).replace(reRegExpChar, '\\$&')
+      .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+    );
+
+    /**
+     * Checks if `value` is a native function.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+     * @example
+     *
+     * _.isNative(Array.prototype.push);
+     * // => true
+     *
+     * _.isNative(_);
+     * // => false
+     */
+    function isNative(value) {
+      if (value == null) {
+        return false;
+      }
+      if (isFunction(value)) {
+        return reIsNative.test(funcToString.call(value));
+      }
+      return isObjectLike(value) &&
+        (isHostObject(value) ? reIsNative : reIsHostCtor).test(value);
     }
-    fromIndex = toInteger(fromIndex);
-    if (fromIndex < 0) {
-      fromIndex = nativeMax$1(length + fromIndex, 0);
+
+    /**
+     * Gets the native function at `key` of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {string} key The key of the method to get.
+     * @returns {*} Returns the function if it's native, else `undefined`.
+     */
+    function getNative(object, key) {
+      var value = object[key];
+      return isNative(value) ? value : undefined;
+    }
+
+    /* Built-in method references that are verified to be native. */
+    var nativeCreate = getNative(Object, 'create');
+
+    /** Used for built-in method references. */
+    var objectProto$5 = Object.prototype;
+
+    /**
+     * Creates an hash object.
+     *
+     * @private
+     * @constructor
+     * @returns {Object} Returns the new hash object.
+     */
+    function Hash() {}
+
+    // Avoid inheriting from `Object.prototype` when possible.
+    Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto$5;
+
+    /**
+     * Checks if `value` is a global object.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {null|Object} Returns `value` if it's a global object, else `null`.
+     */
+    function checkGlobal(value) {
+      return (value && value.Object === Object) ? value : null;
+    }
+
+    /** Used to determine if values are of the language type `Object`. */
+    var objectTypes = {
+      'function': true,
+      'object': true
+    };
+
+    /** Detect free variable `exports`. */
+    var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)
+      ? exports
+      : undefined;
+
+    /** Detect free variable `module`. */
+    var freeModule = (objectTypes[typeof module] && module && !module.nodeType)
+      ? module
+      : undefined;
+
+    /** Detect free variable `global` from Node.js. */
+    var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);
+
+    /** Detect free variable `self`. */
+    var freeSelf = checkGlobal(objectTypes[typeof self] && self);
+
+    /** Detect free variable `window`. */
+    var freeWindow = checkGlobal(objectTypes[typeof window] && window);
+
+    /** Detect `this` as the global object. */
+    var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
+
+    /**
+     * Used as a reference to the global object.
+     *
+     * The `this` value is used if it's the global object to avoid Greasemonkey's
+     * restricted `window` object, otherwise the `window` object is used.
+     */
+    var root = freeGlobal ||
+      ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) ||
+        freeSelf || thisGlobal || Function('return this')();
+
+    /* Built-in method references that are verified to be native. */
+    var Map = getNative(root, 'Map');
+
+    /**
+     * Removes all key-value entries from the map.
+     *
+     * @private
+     * @name clear
+     * @memberOf MapCache
+     */
+    function mapClear() {
+      this.__data__ = {
+        'hash': new Hash,
+        'map': Map ? new Map : [],
+        'string': new Hash
+      };
     }
-    return baseIndexOf(array, value, fromIndex);
-  }
 
-  function auto (tasks, concurrency, callback) {
-      if (typeof arguments[1] === 'function') {
-          // concurrency is optional, shift the args.
-          callback = concurrency;
-          concurrency = null;
+    /** Used for built-in method references. */
+    var objectProto$7 = Object.prototype;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty$3 = objectProto$7.hasOwnProperty;
+
+    /**
+     * Checks if a hash value for `key` exists.
+     *
+     * @private
+     * @param {Object} hash The hash to query.
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function hashHas(hash, key) {
+      return nativeCreate ? hash[key] !== undefined : hasOwnProperty$3.call(hash, key);
+    }
+
+    /**
+     * Removes `key` and its value from the hash.
+     *
+     * @private
+     * @param {Object} hash The hash to modify.
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function hashDelete(hash, key) {
+      return hashHas(hash, key) && delete hash[key];
+    }
+
+    /**
+     * Checks if `value` is suitable for use as unique object key.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
+     */
+    function isKeyable(value) {
+      var type = typeof value;
+      return type == 'number' || type == 'boolean' ||
+        (type == 'string' && value != '__proto__') || value == null;
+    }
+
+    /**
+     * Removes `key` and its value from the map.
+     *
+     * @private
+     * @name delete
+     * @memberOf MapCache
+     * @param {string} key The key of the value to remove.
+     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+     */
+    function mapDelete(key) {
+      var data = this.__data__;
+      if (isKeyable(key)) {
+        return hashDelete(typeof key == 'string' ? data.string : data.hash, key);
       }
-      callback = once(callback || noop);
-      var keys$$ = keys(tasks);
-      var remainingTasks = keys$$.length;
-      if (!remainingTasks) {
-          return callback(null);
+      return Map ? data.map['delete'](key) : assocDelete(data.map, key);
+    }
+
+    /** Used to stand-in for `undefined` hash values. */
+    var HASH_UNDEFINED = '__lodash_hash_undefined__';
+
+    /** Used for built-in method references. */
+    var objectProto$8 = Object.prototype;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty$4 = objectProto$8.hasOwnProperty;
+
+    /**
+     * Gets the hash value for `key`.
+     *
+     * @private
+     * @param {Object} hash The hash to query.
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function hashGet(hash, key) {
+      if (nativeCreate) {
+        var result = hash[key];
+        return result === HASH_UNDEFINED ? undefined : result;
       }
-      if (!concurrency) {
-          concurrency = remainingTasks;
+      return hasOwnProperty$4.call(hash, key) ? hash[key] : undefined;
+    }
+
+    /**
+     * Gets the map value for `key`.
+     *
+     * @private
+     * @name get
+     * @memberOf MapCache
+     * @param {string} key The key of the value to get.
+     * @returns {*} Returns the entry value.
+     */
+    function mapGet(key) {
+      var data = this.__data__;
+      if (isKeyable(key)) {
+        return hashGet(typeof key == 'string' ? data.string : data.hash, key);
       }
+      return Map ? data.map.get(key) : assocGet(data.map, key);
+    }
 
-      var results = {};
-      var runningTasks = 0;
-      var hasError = false;
+    /**
+     * Checks if a map value for `key` exists.
+     *
+     * @private
+     * @name has
+     * @memberOf MapCache
+     * @param {string} key The key of the entry to check.
+     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+     */
+    function mapHas(key) {
+      var data = this.__data__;
+      if (isKeyable(key)) {
+        return hashHas(typeof key == 'string' ? data.string : data.hash, key);
+      }
+      return Map ? data.map.has(key) : assocHas(data.map, key);
+    }
 
-      var listeners = [];
-      function addListener(fn) {
-          listeners.unshift(fn);
+    /**
+     * Sets the associative array `key` to `value`.
+     *
+     * @private
+     * @param {Array} array The array to modify.
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     */
+    function assocSet(array, key, value) {
+      var index = assocIndexOf(array, key);
+      if (index < 0) {
+        array.push([key, value]);
+      } else {
+        array[index][1] = value;
       }
-      function removeListener(fn) {
-          var idx = indexOf(listeners, fn);
-          if (idx >= 0) listeners.splice(idx, 1);
+    }
+
+    /** Used to stand-in for `undefined` hash values. */
+    var HASH_UNDEFINED$1 = '__lodash_hash_undefined__';
+
+    /**
+     * Sets the hash `key` to `value`.
+     *
+     * @private
+     * @param {Object} hash The hash to modify.
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     */
+    function hashSet(hash, key, value) {
+      hash[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED$1 : value;
+    }
+
+    /**
+     * Sets the map `key` to `value`.
+     *
+     * @private
+     * @name set
+     * @memberOf MapCache
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     * @returns {Object} Returns the map cache object.
+     */
+    function mapSet(key, value) {
+      var data = this.__data__;
+      if (isKeyable(key)) {
+        hashSet(typeof key == 'string' ? data.string : data.hash, key, value);
+      } else if (Map) {
+        data.map.set(key, value);
+      } else {
+        assocSet(data.map, key, value);
       }
-      function taskComplete() {
-          remainingTasks--;
-          arrayEach(listeners.slice(), function (fn) {
-              fn();
-          });
+      return this;
+    }
+
+    /**
+     * Creates a map cache object to store key-value pairs.
+     *
+     * @private
+     * @constructor
+     * @param {Array} [values] The values to cache.
+     */
+    function MapCache(values) {
+      var index = -1,
+          length = values ? values.length : 0;
+
+      this.clear();
+      while (++index < length) {
+        var entry = values[index];
+        this.set(entry[0], entry[1]);
       }
+    }
 
-      addListener(function () {
-          if (!remainingTasks) {
-              callback(null, results);
-          }
-      });
+    // Add functions to the `MapCache`.
+    MapCache.prototype.clear = mapClear;
+    MapCache.prototype['delete'] = mapDelete;
+    MapCache.prototype.get = mapGet;
+    MapCache.prototype.has = mapHas;
+    MapCache.prototype.set = mapSet;
+
+    /** Used as the size to enable large array optimizations. */
+    var LARGE_ARRAY_SIZE = 200;
+
+    /**
+     * Sets the stack `key` to `value`.
+     *
+     * @private
+     * @name set
+     * @memberOf Stack
+     * @param {string} key The key of the value to set.
+     * @param {*} value The value to set.
+     * @returns {Object} Returns the stack cache object.
+     */
+    function stackSet(key, value) {
+      var data = this.__data__,
+          array = data.array;
+
+      if (array) {
+        if (array.length < (LARGE_ARRAY_SIZE - 1)) {
+          assocSet(array, key, value);
+        } else {
+          data.array = null;
+          data.map = new MapCache(array);
+        }
+      }
+      var map = data.map;
+      if (map) {
+        map.set(key, value);
+      }
+      return this;
+    }
 
-      arrayEach(keys$$, function (k) {
-          if (hasError) return;
-          var task = isArray(tasks[k]) ? tasks[k] : [tasks[k]];
-          var taskCallback = rest(function (err, args) {
-              runningTasks--;
-              if (args.length <= 1) {
-                  args = args[0];
-              }
-              if (err) {
-                  var safeResults = {};
-                  forOwn(results, function (val, rkey) {
-                      safeResults[rkey] = val;
-                  });
-                  safeResults[k] = args;
-                  hasError = true;
-
-                  callback(err, safeResults);
-              } else {
-                  results[k] = args;
-                  setImmediate$1(taskComplete);
-              }
-          });
-          var requires = task.slice(0, task.length - 1);
-          // prevent dead-locks
-          var len = requires.length;
-          var dep;
-          while (len--) {
-              if (!(dep = tasks[requires[len]])) {
-                  throw new Error('Has non-existent dependency in ' + requires.join(', '));
-              }
-              if (isArray(dep) && indexOf(dep, k) >= 0) {
-                  throw new Error('Has cyclic dependencies');
-              }
-          }
-          function ready() {
-              return runningTasks < concurrency && !baseHas(results, k) && arrayEvery(requires, function (x) {
-                  return baseHas(results, x);
-              });
-          }
-          if (ready()) {
-              runningTasks++;
-              task[task.length - 1](taskCallback, results);
-          } else {
-              addListener(listener);
-          }
-          function listener() {
-              if (ready()) {
-                  runningTasks++;
-                  removeListener(listener);
-                  task[task.length - 1](taskCallback, results);
-              }
-          }
-      });
-  }
-
-  /**
-   * A specialized version of `_.map` for arrays without support for iteratee
-   * shorthands.
-   *
-   * @private
-   * @param {Array} array The array to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Array} Returns the new mapped array.
-   */
-  function arrayMap(array, iteratee) {
-    var index = -1,
-        length = array.length,
-        result = Array(length);
-
-    while (++index < length) {
-      result[index] = iteratee(array[index], index, array);
-    }
-    return result;
-  }
-
-  function queue$1(worker, concurrency, payload) {
-      if (concurrency == null) {
-          concurrency = 1;
-      } else if (concurrency === 0) {
-          throw new Error('Concurrency must not be zero');
+    /**
+     * Creates a stack cache object to store key-value pairs.
+     *
+     * @private
+     * @constructor
+     * @param {Array} [values] The values to cache.
+     */
+    function Stack(values) {
+      var index = -1,
+          length = values ? values.length : 0;
+
+      this.clear();
+      while (++index < length) {
+        var entry = values[index];
+        this.set(entry[0], entry[1]);
       }
-      function _insert(q, data, pos, callback) {
-          if (callback != null && typeof callback !== 'function') {
-              throw new Error('task callback must be a function');
-          }
-          q.started = true;
-          if (!isArray(data)) {
-              data = [data];
-          }
-          if (data.length === 0 && q.idle()) {
-              // call drain immediately if there are no tasks
-              return setImmediate$1(function () {
-                  q.drain();
-              });
-          }
-          arrayEach(data, function (task) {
-              var item = {
-                  data: task,
-                  callback: callback || noop
-              };
-
-              if (pos) {
-                  q.tasks.unshift(item);
-              } else {
-                  q.tasks.push(item);
-              }
-
-              if (q.tasks.length === q.concurrency) {
-                  q.saturated();
-              }
-          });
-          setImmediate$1(q.process);
+    }
+
+    // Add functions to the `Stack` cache.
+    Stack.prototype.clear = stackClear;
+    Stack.prototype['delete'] = stackDelete;
+    Stack.prototype.get = stackGet;
+    Stack.prototype.has = stackHas;
+    Stack.prototype.set = stackSet;
+
+    /** Used for built-in method references. */
+    var objectProto$9 = Object.prototype;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty$5 = objectProto$9.hasOwnProperty;
+
+    /**
+     * Assigns `value` to `key` of `object` if the existing value is not equivalent
+     * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * for equality comparisons.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {string} key The key of the property to assign.
+     * @param {*} value The value to assign.
+     */
+    function assignValue(object, key, value) {
+      var objValue = object[key];
+      if (!(hasOwnProperty$5.call(object, key) && eq(objValue, value)) ||
+          (value === undefined && !(key in object))) {
+        object[key] = value;
+      }
+    }
+
+    /**
+     * This function is like `copyObject` except that it accepts a function to
+     * customize copied values.
+     *
+     * @private
+     * @param {Object} source The object to copy properties from.
+     * @param {Array} props The property names to copy.
+     * @param {Object} [object={}] The object to copy properties to.
+     * @param {Function} [customizer] The function to customize copied values.
+     * @returns {Object} Returns `object`.
+     */
+    function copyObjectWith(source, props, object, customizer) {
+      object || (object = {});
+
+      var index = -1,
+          length = props.length;
+
+      while (++index < length) {
+        var key = props[index];
+
+        var newValue = customizer
+          ? customizer(object[key], source[key], key, object, source)
+          : source[key];
+
+        assignValue(object, key, newValue);
       }
-      function _next(q, tasks) {
-          return function () {
-              workers -= 1;
-
-              var removed = false;
-              var args = arguments;
-              arrayEach(tasks, function (task) {
-                  arrayEach(workersList, function (worker, index) {
-                      if (worker === task && !removed) {
-                          workersList.splice(index, 1);
-                          removed = true;
-                      }
-                  });
-
-                  task.callback.apply(task, args);
-              });
-              if (q.tasks.length + workers === 0) {
-                  q.drain();
-              }
-              q.process();
-          };
+      return object;
+    }
+
+    /**
+     * Copies properties of `source` to `object`.
+     *
+     * @private
+     * @param {Object} source The object to copy properties from.
+     * @param {Array} props The property names to copy.
+     * @param {Object} [object={}] The object to copy properties to.
+     * @returns {Object} Returns `object`.
+     */
+    function copyObject(source, props, object) {
+      return copyObjectWith(source, props, object);
+    }
+
+    /**
+     * The base implementation of `_.assign` without support for multiple sources
+     * or `customizer` functions.
+     *
+     * @private
+     * @param {Object} object The destination object.
+     * @param {Object} source The source object.
+     * @returns {Object} Returns `object`.
+     */
+    function baseAssign(object, source) {
+      return object && copyObject(source, keys(source), object);
+    }
+
+    /**
+     * Creates a clone of  `buffer`.
+     *
+     * @private
+     * @param {Buffer} buffer The buffer to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Buffer} Returns the cloned buffer.
+     */
+    function cloneBuffer(buffer, isDeep) {
+      if (isDeep) {
+        return buffer.slice();
       }
+      var result = new buffer.constructor(buffer.length);
+      buffer.copy(result);
+      return result;
+    }
+
+    /**
+     * Copies the values of `source` to `array`.
+     *
+     * @private
+     * @param {Array} source The array to copy values from.
+     * @param {Array} [array=[]] The array to copy values to.
+     * @returns {Array} Returns `array`.
+     */
+    function copyArray(source, array) {
+      var index = -1,
+          length = source.length;
 
-      var workers = 0;
-      var workersList = [];
-      var q = {
-          tasks: [],
-          concurrency: concurrency,
-          payload: payload,
-          saturated: noop,
-          empty: noop,
-          drain: noop,
-          started: false,
-          paused: false,
-          push: function (data, callback) {
-              _insert(q, data, false, callback);
-          },
-          kill: function () {
-              q.drain = noop;
-              q.tasks = [];
-          },
-          unshift: function (data, callback) {
-              _insert(q, data, true, callback);
-          },
-          process: function () {
-              while (!q.paused && workers < q.concurrency && q.tasks.length) {
-
-                  var tasks = q.payload ? q.tasks.splice(0, q.payload) : q.tasks.splice(0, q.tasks.length);
-
-                  var data = arrayMap(tasks, baseProperty('data'));
-
-                  if (q.tasks.length === 0) {
-                      q.empty();
-                  }
-                  workers += 1;
-                  workersList.push(tasks[0]);
-                  var cb = onlyOnce(_next(q, tasks));
-                  worker(data, cb);
-              }
-          },
-          length: function () {
-              return q.tasks.length;
-          },
-          running: function () {
-              return workers;
-          },
-          workersList: function () {
-              return workersList;
-          },
-          idle: function () {
-              return q.tasks.length + workers === 0;
-          },
-          pause: function () {
-              q.paused = true;
-          },
-          resume: function () {
-              if (q.paused === false) {
-                  return;
-              }
-              q.paused = false;
-              var resumeCount = Math.min(q.concurrency, q.tasks.length);
-              // Need to call q.process once per concurrent
-              // worker to preserve full concurrency after pause
-              for (var w = 1; w <= resumeCount; w++) {
-                  setImmediate$1(q.process);
-              }
+      array || (array = Array(length));
+      while (++index < length) {
+        array[index] = source[index];
+      }
+      return array;
+    }
+
+    /** Built-in value references. */
+    var getOwnPropertySymbols = Object.getOwnPropertySymbols;
+
+    /**
+     * Creates an array of the own symbol properties of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @returns {Array} Returns the array of symbols.
+     */
+    var getSymbols = getOwnPropertySymbols || function() {
+      return [];
+    };
+
+    /**
+     * Copies own symbol properties of `source` to `object`.
+     *
+     * @private
+     * @param {Object} source The object to copy symbols from.
+     * @param {Object} [object={}] The object to copy symbols to.
+     * @returns {Object} Returns `object`.
+     */
+    function copySymbols(source, object) {
+      return copyObject(source, getSymbols(source), object);
+    }
+
+    /* Built-in method references that are verified to be native. */
+    var Set = getNative(root, 'Set');
+
+    /* Built-in method references that are verified to be native. */
+    var WeakMap = getNative(root, 'WeakMap');
+
+    var mapTag$1 = '[object Map]';
+    var objectTag$1 = '[object Object]';
+    var setTag$1 = '[object Set]';
+    var weakMapTag$1 = '[object WeakMap]';
+    /** Used for built-in method references. */
+    var objectProto$10 = Object.prototype;
+
+    /** Used to resolve the decompiled source of functions. */
+    var funcToString$1 = Function.prototype.toString;
+
+    /**
+     * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+     * of values.
+     */
+    var objectToString$3 = objectProto$10.toString;
+
+    /** Used to detect maps, sets, and weakmaps. */
+    var mapCtorString = Map ? funcToString$1.call(Map) : '';
+    var setCtorString = Set ? funcToString$1.call(Set) : '';
+    var weakMapCtorString = WeakMap ? funcToString$1.call(WeakMap) : '';
+    /**
+     * Gets the `toStringTag` of `value`.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @returns {string} Returns the `toStringTag`.
+     */
+    function getTag(value) {
+      return objectToString$3.call(value);
+    }
+
+    // Fallback for IE 11 providing `toStringTag` values for maps, sets, and weakmaps.
+    if ((Map && getTag(new Map) != mapTag$1) ||
+        (Set && getTag(new Set) != setTag$1) ||
+        (WeakMap && getTag(new WeakMap) != weakMapTag$1)) {
+      getTag = function(value) {
+        var result = objectToString$3.call(value),
+            Ctor = result == objectTag$1 ? value.constructor : null,
+            ctorString = typeof Ctor == 'function' ? funcToString$1.call(Ctor) : '';
+
+        if (ctorString) {
+          switch (ctorString) {
+            case mapCtorString: return mapTag$1;
+            case setCtorString: return setTag$1;
+            case weakMapCtorString: return weakMapTag$1;
           }
+        }
+        return result;
       };
-      return q;
-  }
-
-  function cargo(worker, payload) {
-      return queue$1(worker, 1, payload);
-  }
-
-  function reduce(arr, memo, iterator, cb) {
-      eachOfSeries(arr, function (x, i, cb) {
-          iterator(memo, x, function (err, v) {
-              memo = v;
-              cb(err);
-          });
-      }, function (err) {
-          cb(err, memo);
-      });
-  }
-
-  function seq() /* functions... */{
-      var fns = arguments;
-      return rest(function (args) {
-          var that = this;
-
-          var cb = args[args.length - 1];
-          if (typeof cb == 'function') {
-              args.pop();
-          } else {
-              cb = noop;
-          }
+    }
 
-          reduce(fns, args, function (newargs, fn, cb) {
-              fn.apply(that, newargs.concat([rest(function (err, nextargs) {
-                  cb(err, nextargs);
-              })]));
-          }, function (err, results) {
-              cb.apply(that, [err].concat(results));
-          });
+    var getTag$1 = getTag;
+
+    /** Used for built-in method references. */
+    var objectProto$11 = Object.prototype;
+
+    /** Used to check objects for own properties. */
+    var hasOwnProperty$6 = objectProto$11.hasOwnProperty;
+
+    /**
+     * Initializes an array clone.
+     *
+     * @private
+     * @param {Array} array The array to clone.
+     * @returns {Array} Returns the initialized clone.
+     */
+    function initCloneArray(array) {
+      var length = array.length,
+          result = array.constructor(length);
+
+      // Add properties assigned by `RegExp#exec`.
+      if (length && typeof array[0] == 'string' && hasOwnProperty$6.call(array, 'index')) {
+        result.index = array.index;
+        result.input = array.input;
+      }
+      return result;
+    }
+
+    /** Built-in value references. */
+    var Uint8Array = root.Uint8Array;
+
+    /**
+     * Creates a clone of `arrayBuffer`.
+     *
+     * @private
+     * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
+     * @returns {ArrayBuffer} Returns the cloned array buffer.
+     */
+    function cloneArrayBuffer(arrayBuffer) {
+      var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
+      new Uint8Array(result).set(new Uint8Array(arrayBuffer));
+      return result;
+    }
+
+    /**
+     * Adds the key-value `pair` to `map`.
+     *
+     * @private
+     * @param {Object} map The map to modify.
+     * @param {Array} pair The key-value pair to add.
+     * @returns {Object} Returns `map`.
+     */
+    function addMapEntry(map, pair) {
+      // Don't return `Map#set` because it doesn't return the map instance in IE 11.
+      map.set(pair[0], pair[1]);
+      return map;
+    }
+
+    /**
+     * A specialized version of `_.reduce` for arrays without support for
+     * iteratee shorthands.
+     *
+     * @private
+     * @param {Array} array The array to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @param {*} [accumulator] The initial value.
+     * @param {boolean} [initAccum] Specify using the first element of `array` as the initial value.
+     * @returns {*} Returns the accumulated value.
+     */
+    function arrayReduce(array, iteratee, accumulator, initAccum) {
+      var index = -1,
+          length = array.length;
+
+      if (initAccum && length) {
+        accumulator = array[++index];
+      }
+      while (++index < length) {
+        accumulator = iteratee(accumulator, array[index], index, array);
+      }
+      return accumulator;
+    }
+
+    /**
+     * Converts `map` to an array.
+     *
+     * @private
+     * @param {Object} map The map to convert.
+     * @returns {Array} Returns the converted array.
+     */
+    function mapToArray(map) {
+      var index = -1,
+          result = Array(map.size);
+
+      map.forEach(function(value, key) {
+        result[++index] = [key, value];
       });
-  }
+      return result;
+    }
 
-  var reverse = Array.prototype.reverse;
+    /**
+     * Creates a clone of `map`.
+     *
+     * @private
+     * @param {Object} map The map to clone.
+     * @returns {Object} Returns the cloned map.
+     */
+    function cloneMap(map) {
+      return arrayReduce(mapToArray(map), addMapEntry, new map.constructor);
+    }
 
-  function compose() /* functions... */{
-      return seq.apply(null, reverse.call(arguments));
-  }
+    /** Used to match `RegExp` flags from their coerced string values. */
+    var reFlags = /\w*$/;
+
+    /**
+     * Creates a clone of `regexp`.
+     *
+     * @private
+     * @param {Object} regexp The regexp to clone.
+     * @returns {Object} Returns the cloned regexp.
+     */
+    function cloneRegExp(regexp) {
+      var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
+      result.lastIndex = regexp.lastIndex;
+      return result;
+    }
 
-  function concat$1(eachfn, arr, fn, callback) {
-      var result = [];
-      eachfn(arr, function (x, index, cb) {
-          fn(x, function (err, y) {
-              result = result.concat(y || []);
-              cb(err);
-          });
-      }, function (err) {
-          callback(err, result);
+    /**
+     * Adds `value` to `set`.
+     *
+     * @private
+     * @param {Object} set The set to modify.
+     * @param {*} value The value to add.
+     * @returns {Object} Returns `set`.
+     */
+    function addSetEntry(set, value) {
+      set.add(value);
+      return set;
+    }
+
+    /**
+     * Converts `set` to an array.
+     *
+     * @private
+     * @param {Object} set The set to convert.
+     * @returns {Array} Returns the converted array.
+     */
+    function setToArray(set) {
+      var index = -1,
+          result = Array(set.size);
+
+      set.forEach(function(value) {
+        result[++index] = value;
       });
-  }
+      return result;
+    }
 
-  function doParallel(fn) {
-      return function (obj, iterator, callback) {
-          return fn(eachOf, obj, iterator, callback);
-      };
-  }
+    /**
+     * Creates a clone of `set`.
+     *
+     * @private
+     * @param {Object} set The set to clone.
+     * @returns {Object} Returns the cloned set.
+     */
+    function cloneSet(set) {
+      return arrayReduce(setToArray(set), addSetEntry, new set.constructor);
+    }
 
-  var concat = doParallel(concat$1);
+    /** Built-in value references. */
+    var Symbol = root.Symbol;
+
+    var symbolProto = Symbol ? Symbol.prototype : undefined;
+    var symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;
+    /**
+     * Creates a clone of the `symbol` object.
+     *
+     * @private
+     * @param {Object} symbol The symbol object to clone.
+     * @returns {Object} Returns the cloned symbol object.
+     */
+    function cloneSymbol(symbol) {
+      return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
+    }
 
-  function doSeries(fn) {
-      return function (obj, iterator, callback) {
-          return fn(eachOfSeries, obj, iterator, callback);
-      };
-  }
+    /**
+     * Creates a clone of `typedArray`.
+     *
+     * @private
+     * @param {Object} typedArray The typed array to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Object} Returns the cloned typed array.
+     */
+    function cloneTypedArray(typedArray, isDeep) {
+      var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
+      return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
+    }
 
-  var concatSeries = doSeries(concat$1);
+    var boolTag$1 = '[object Boolean]';
+    var dateTag$1 = '[object Date]';
+    var mapTag$2 = '[object Map]';
+    var numberTag$1 = '[object Number]';
+    var regexpTag$1 = '[object RegExp]';
+    var setTag$2 = '[object Set]';
+    var stringTag$2 = '[object String]';
+    var symbolTag$1 = '[object Symbol]';
+    var arrayBufferTag$1 = '[object ArrayBuffer]';
+    var float32Tag$1 = '[object Float32Array]';
+    var float64Tag$1 = '[object Float64Array]';
+    var int8Tag$1 = '[object Int8Array]';
+    var int16Tag$1 = '[object Int16Array]';
+    var int32Tag$1 = '[object Int32Array]';
+    var uint8Tag$1 = '[object Uint8Array]';
+    var uint8ClampedTag$1 = '[object Uint8ClampedArray]';
+    var uint16Tag$1 = '[object Uint16Array]';
+    var uint32Tag$1 = '[object Uint32Array]';
+    /**
+     * Initializes an object clone based on its `toStringTag`.
+     *
+     * **Note:** This function only supports cloning values with tags of
+     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
+     *
+     * @private
+     * @param {Object} object The object to clone.
+     * @param {string} tag The `toStringTag` of the object to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Object} Returns the initialized clone.
+     */
+    function initCloneByTag(object, tag, isDeep) {
+      var Ctor = object.constructor;
+      switch (tag) {
+        case arrayBufferTag$1:
+          return cloneArrayBuffer(object);
+
+        case boolTag$1:
+        case dateTag$1:
+          return new Ctor(+object);
+
+        case float32Tag$1: case float64Tag$1:
+        case int8Tag$1: case int16Tag$1: case int32Tag$1:
+        case uint8Tag$1: case uint8ClampedTag$1: case uint16Tag$1: case uint32Tag$1:
+          return cloneTypedArray(object, isDeep);
+
+        case mapTag$2:
+          return cloneMap(object);
+
+        case numberTag$1:
+        case stringTag$2:
+          return new Ctor(object);
+
+        case regexpTag$1:
+          return cloneRegExp(object);
+
+        case setTag$2:
+          return cloneSet(object);
+
+        case symbolTag$1:
+          return cloneSymbol(object);
+      }
+    }
 
-  var constant = rest(function (values) {
-      var args = [null].concat(values);
-      return function (cb) {
-          return cb.apply(this, args);
+    /** Built-in value references. */
+    var objectCreate = Object.create;
+
+    /**
+     * The base implementation of `_.create` without support for assigning
+     * properties to the created object.
+     *
+     * @private
+     * @param {Object} prototype The object to inherit from.
+     * @returns {Object} Returns the new object.
+     */
+    function baseCreate(proto) {
+      return isObject(proto) ? objectCreate(proto) : {};
+    }
+
+    /** Built-in value references. */
+    var getPrototypeOf$1 = Object.getPrototypeOf;
+
+    /**
+     * Initializes an object clone.
+     *
+     * @private
+     * @param {Object} object The object to clone.
+     * @returns {Object} Returns the initialized clone.
+     */
+    function initCloneObject(object) {
+      return (typeof object.constructor == 'function' && !isPrototype(object))
+        ? baseCreate(getPrototypeOf$1(object))
+        : {};
+    }
+
+    /**
+     * Creates a function that returns `value`.
+     *
+     * @static
+     * @memberOf _
+     * @category Util
+     * @param {*} value The value to return from the new function.
+     * @returns {Function} Returns the new function.
+     * @example
+     *
+     * var object = { 'user': 'fred' };
+     * var getter = _.constant(object);
+     *
+     * getter() === object;
+     * // => true
+     */
+    function constant(value) {
+      return function() {
+        return value;
       };
-  });
-
-  function _createTester(eachfn, check, getResult) {
-      return function (arr, limit, iterator, cb) {
-          function done(err) {
-              if (cb) {
-                  if (err) {
-                      cb(err);
-                  } else {
-                      cb(null, getResult(false, void 0));
-                  }
-              }
+    }
+
+    /** Used to determine if values are of the language type `Object`. */
+    var objectTypes$1 = {
+      'function': true,
+      'object': true
+    };
+
+    /** Detect free variable `exports`. */
+    var freeExports$1 = (objectTypes$1[typeof exports] && exports && !exports.nodeType)
+      ? exports
+      : undefined;
+
+    /** Detect free variable `module`. */
+    var freeModule$1 = (objectTypes$1[typeof module] && module && !module.nodeType)
+      ? module
+      : undefined;
+
+    /** Detect the popular CommonJS extension `module.exports`. */
+    var moduleExports = (freeModule$1 && freeModule$1.exports === freeExports$1)
+      ? freeExports$1
+      : undefined;
+
+    /** Built-in value references. */
+    var Buffer = moduleExports ? root.Buffer : undefined;
+
+    /**
+     * Checks if `value` is a buffer.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
+     * @example
+     *
+     * _.isBuffer(new Buffer(2));
+     * // => true
+     *
+     * _.isBuffer(new Uint8Array(2));
+     * // => false
+     */
+    var isBuffer = !Buffer ? constant(false) : function(value) {
+      return value instanceof Buffer;
+    };
+
+    var argsTag$1 = '[object Arguments]';
+    var arrayTag = '[object Array]';
+    var boolTag = '[object Boolean]';
+    var dateTag = '[object Date]';
+    var errorTag = '[object Error]';
+    var funcTag$1 = '[object Function]';
+    var genTag$1 = '[object GeneratorFunction]';
+    var mapTag = '[object Map]';
+    var numberTag = '[object Number]';
+    var objectTag = '[object Object]';
+    var regexpTag = '[object RegExp]';
+    var setTag = '[object Set]';
+    var stringTag$1 = '[object String]';
+    var symbolTag = '[object Symbol]';
+    var weakMapTag = '[object WeakMap]';
+    var arrayBufferTag = '[object ArrayBuffer]';
+    var float32Tag = '[object Float32Array]';
+    var float64Tag = '[object Float64Array]';
+    var int8Tag = '[object Int8Array]';
+    var int16Tag = '[object Int16Array]';
+    var int32Tag = '[object Int32Array]';
+    var uint8Tag = '[object Uint8Array]';
+    var uint8ClampedTag = '[object Uint8ClampedArray]';
+    var uint16Tag = '[object Uint16Array]';
+    var uint32Tag = '[object Uint32Array]';
+    /** Used to identify `toStringTag` values supported by `_.clone`. */
+    var cloneableTags = {};
+    cloneableTags[argsTag$1] = cloneableTags[arrayTag] =
+    cloneableTags[arrayBufferTag] = cloneableTags[boolTag] =
+    cloneableTags[dateTag] = cloneableTags[float32Tag] =
+    cloneableTags[float64Tag] = cloneableTags[int8Tag] =
+    cloneableTags[int16Tag] = cloneableTags[int32Tag] =
+    cloneableTags[mapTag] = cloneableTags[numberTag] =
+    cloneableTags[objectTag] = cloneableTags[regexpTag] =
+    cloneableTags[setTag] = cloneableTags[stringTag$1] =
+    cloneableTags[symbolTag] = cloneableTags[uint8Tag] =
+    cloneableTags[uint8ClampedTag] = cloneableTags[uint16Tag] =
+    cloneableTags[uint32Tag] = true;
+    cloneableTags[errorTag] = cloneableTags[funcTag$1] =
+    cloneableTags[weakMapTag] = false;
+
+    /**
+     * The base implementation of `_.clone` and `_.cloneDeep` which tracks
+     * traversed objects.
+     *
+     * @private
+     * @param {*} value The value to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @param {boolean} [isFull] Specify a clone including symbols.
+     * @param {Function} [customizer] The function to customize cloning.
+     * @param {string} [key] The key of `value`.
+     * @param {Object} [object] The parent object of `value`.
+     * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
+     * @returns {*} Returns the cloned value.
+     */
+    function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
+      var result;
+      if (customizer) {
+        result = object ? customizer(value, key, object, stack) : customizer(value);
+      }
+      if (result !== undefined) {
+        return result;
+      }
+      if (!isObject(value)) {
+        return value;
+      }
+      var isArr = isArray(value);
+      if (isArr) {
+        result = initCloneArray(value);
+        if (!isDeep) {
+          return copyArray(value, result);
+        }
+      } else {
+        var tag = getTag$1(value),
+            isFunc = tag == funcTag$1 || tag == genTag$1;
+
+        if (isBuffer(value)) {
+          return cloneBuffer(value, isDeep);
+        }
+        if (tag == objectTag || tag == argsTag$1 || (isFunc && !object)) {
+          if (isHostObject(value)) {
+            return object ? value : {};
           }
-          function iteratee(x, _, callback) {
-              if (!cb) return callback();
-              iterator(x, function (err, v) {
-                  if (cb) {
-                      if (err) {
-                          cb(err);
-                          cb = iterator = false;
-                      } else if (check(v)) {
-                          cb(null, getResult(true, x));
-                          cb = iterator = false;
-                      }
-                  }
-                  callback();
-              });
+          result = initCloneObject(isFunc ? {} : value);
+          if (!isDeep) {
+            result = baseAssign(result, value);
+            return isFull ? copySymbols(value, result) : result;
           }
-          if (arguments.length > 3) {
-              eachfn(arr, limit, iteratee, done);
-          } else {
-              cb = iterator;
-              iterator = limit;
-              eachfn(arr, iteratee, done);
+        } else {
+          if (!cloneableTags[tag]) {
+            return object ? value : {};
           }
-      };
-  }
+          result = initCloneByTag(value, tag, isDeep);
+        }
+      }
+      // Check for circular references and return its corresponding clone.
+      stack || (stack = new Stack);
+      var stacked = stack.get(value);
+      if (stacked) {
+        return stacked;
+      }
+      stack.set(value, result);
 
-  function _findGetResult(v, x) {
-      return x;
-  }
+      // Recursively populate clone (susceptible to call stack limits).
+      (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) {
+        assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack));
+      });
+      return (isFull && !isArr) ? copySymbols(value, result) : result;
+    }
 
-  var detect = _createTester(eachOf, identity, _findGetResult);
+    var argsRegex = /^function\s*[^\(]*\(\s*([^\)]*)\)/m;
 
-  function _eachOfLimit(limit) {
-      return function (obj, iterator, callback) {
-          callback = once(callback || noop);
-          obj = obj || [];
-          var nextKey = keyIterator(obj);
-          if (limit <= 0) {
-              return callback(null);
-          }
-          var done = false;
-          var running = 0;
-          var errored = false;
-
-          (function replenish() {
-              if (done && running <= 0) {
-                  return callback(null);
-              }
-
-              while (running < limit && !errored) {
-                  var key = nextKey();
-                  if (key === null) {
-                      done = true;
-                      if (running <= 0) {
-                          callback(null);
-                      }
-                      return;
-                  }
-                  running += 1;
-                  iterator(obj[key], key, onlyOnce(function (err) {
-                      running -= 1;
-                      if (err) {
-                          callback(err);
-                          errored = true;
-                      } else {
-                          replenish();
-                      }
-                  }));
-              }
-          })();
-      };
-  }
-
-  function eachOfLimit(obj, limit, iterator, cb) {
-      _eachOfLimit(limit)(obj, iterator, cb);
-  }
-
-  var detectLimit = _createTester(eachOfLimit, identity, _findGetResult);
-
-  var detectSeries = _createTester(eachOfSeries, identity, _findGetResult);
-
-  function consoleFunc(name) {
-      return rest(function (fn, args) {
-          fn.apply(null, args.concat([rest(function (err, args) {
-              if (typeof console === 'object') {
-                  if (err) {
-                      if (console.error) {
-                          console.error(err);
-                      }
-                  } else if (console[name]) {
-                      arrayEach(args, function (x) {
-                          console[name](x);
-                      });
-                  }
-              }
-          })]));
-      });
-  }
+    function parseParams(func) {
+        return func.toString().match(argsRegex)[1].split(/\s*\,\s*/);
+    }
 
-  var dir = consoleFunc('dir');
+    function autoInject(tasks, callback) {
+        var newTasks = {};
+
+        forOwn(tasks, function (taskFn, key) {
+            var params;
+
+            if (isArray(taskFn)) {
+                params = baseClone(taskFn);
+                taskFn = params.pop();
+
+                newTasks[key] = params.concat(newTask);
+            } else if (taskFn.length === 0) {
+                throw new Error("autoInject task functions require explicit parameters.");
+            } else if (taskFn.length === 1) {
+                // no dependencies, use the function as-is
+                newTasks[key] = taskFn;
+            } else {
+                params = parseParams(taskFn);
+                params.pop();
+
+                newTasks[key] = params.concat(newTask);
+            }
+
+            function newTask(results, taskCb) {
+                var newArgs = arrayMap(params, function (name) {
+                    return results[name];
+                });
+                newArgs.push(taskCb);
+                taskFn.apply(null, newArgs);
+            }
+        });
+
+        auto(newTasks, callback);
+    }
 
-  function during(test, iterator, cb) {
-      cb = cb || noop;
+    var _setImmediate = typeof setImmediate === 'function' && setImmediate;
+
+    var _defer;
+    if (_setImmediate) {
+        _defer = _setImmediate;
+    } else if (typeof process === 'object' && typeof process.nextTick === 'function') {
+        _defer = process.nextTick;
+    } else {
+        _defer = function (fn) {
+            setTimeout(fn, 0);
+        };
+    }
 
-      var next = rest(function (err, args) {
-          if (err) {
-              cb(err);
-          } else {
-              args.push(check);
-              test.apply(this, args);
-          }
-      });
+    var setImmediate$1 = rest(function (fn, args) {
+        _defer(function () {
+            fn.apply(null, args);
+        });
+    });
 
-      var check = function (err, truth) {
-          if (err) return cb(err);
-          if (!truth) return cb(null);
-          iterator(next);
-      };
+    function queue(worker, concurrency, payload) {
+        if (concurrency == null) {
+            concurrency = 1;
+        } else if (concurrency === 0) {
+            throw new Error('Concurrency must not be zero');
+        }
+        function _insert(q, data, pos, callback) {
+            if (callback != null && typeof callback !== 'function') {
+                throw new Error('task callback must be a function');
+            }
+            q.started = true;
+            if (!isArray(data)) {
+                data = [data];
+            }
+            if (data.length === 0 && q.idle()) {
+                // call drain immediately if there are no tasks
+                return setImmediate$1(function () {
+                    q.drain();
+                });
+            }
+            arrayEach(data, function (task) {
+                var item = {
+                    data: task,
+                    callback: callback || noop
+                };
+
+                if (pos) {
+                    q.tasks.unshift(item);
+                } else {
+                    q.tasks.push(item);
+                }
+
+                if (q.tasks.length === q.concurrency) {
+                    q.saturated();
+                }
+                if (q.tasks.length <= q.concurrency - q.buffer) {
+                    q.unsaturated();
+                }
+            });
+            setImmediate$1(q.process);
+        }
+        function _next(q, tasks) {
+            return function () {
+                workers -= 1;
+
+                var removed = false;
+                var args = arguments;
+                arrayEach(tasks, function (task) {
+                    arrayEach(workersList, function (worker, index) {
+                        if (worker === task && !removed) {
+                            workersList.splice(index, 1);
+                            removed = true;
+                        }
+                    });
+
+                    task.callback.apply(task, args);
+                });
+                if (q.tasks.length + workers === 0) {
+                    q.drain();
+                }
+                q.process();
+            };
+        }
 
-      test(check);
-  }
-
-  function doDuring(iterator, test, cb) {
-      var calls = 0;
-
-      during(function (next) {
-          if (calls++ < 1) return next(null, true);
-          test.apply(this, arguments);
-      }, iterator, cb);
-  }
-
-  function whilst(test, iterator, cb) {
-      cb = cb || noop;
-      if (!test()) return cb(null);
-      var next = rest(function (err, args) {
-          if (err) return cb(err);
-          if (test.apply(this, args)) return iterator(next);
-          cb.apply(null, [null].concat(args));
-      });
-      iterator(next);
-  }
-
-  function doWhilst(iterator, test, cb) {
-      var calls = 0;
-      return whilst(function () {
-          return ++calls <= 1 || test.apply(this, arguments);
-      }, iterator, cb);
-  }
-
-  function doUntil(iterator, test, cb) {
-      return doWhilst(iterator, function () {
-          return !test.apply(this, arguments);
-      }, cb);
-  }
-
-  function _withoutIndex(iterator) {
-      return function (value, index, callback) {
-          return iterator(value, callback);
-      };
-  }
-
-  function each(arr, iterator, cb) {
-      return eachOf(arr, _withoutIndex(iterator), cb);
-  }
-
-  function eachLimit(arr, limit, iterator, cb) {
-      return _eachOfLimit(limit)(arr, _withoutIndex(iterator), cb);
-  }
-
-  function eachSeries(arr, iterator, cb) {
-      return eachOfSeries(arr, _withoutIndex(iterator), cb);
-  }
-
-  function ensureAsync(fn) {
-      return rest(function (args) {
-          var callback = args.pop();
-          var sync = true;
-          args.push(function () {
-              var innerArgs = arguments;
-              if (sync) {
-                  setImmediate$1(function () {
-                      callback.apply(null, innerArgs);
-                  });
-              } else {
-                  callback.apply(null, innerArgs);
-              }
-          });
-          fn.apply(this, args);
-          sync = false;
-      });
-  }
-
-  function notId(v) {
-      return !v;
-  }
-
-  var every = _createTester(eachOf, notId, notId);
-
-  var everyLimit = _createTester(eachOfLimit, notId, notId);
-
-  function _filter(eachfn, arr, iterator, callback) {
-      var results = [];
-      eachfn(arr, function (x, index, callback) {
-          iterator(x, function (err, v) {
-              if (err) {
-                  callback(err);
-              } else {
-                  if (v) {
-                      results.push({ index: index, value: x });
-                  }
-                  callback();
-              }
-          });
-      }, function (err) {
-          if (err) {
-              callback(err);
-          } else {
-              callback(null, arrayMap(results.sort(function (a, b) {
-                  return a.index - b.index;
-              }), baseProperty('value')));
-          }
-      });
-  }
+        var workers = 0;
+        var workersList = [];
+        var q = {
+            tasks: [],
+            concurrency: concurrency,
+            payload: payload,
+            saturated: noop,
+            unsaturated: noop,
+            buffer: concurrency / 4,
+            empty: noop,
+            drain: noop,
+            started: false,
+            paused: false,
+            push: function (data, callback) {
+                _insert(q, data, false, callback);
+            },
+            kill: function () {
+                q.drain = noop;
+                q.tasks = [];
+            },
+            unshift: function (data, callback) {
+                _insert(q, data, true, callback);
+            },
+            process: function () {
+                while (!q.paused && workers < q.concurrency && q.tasks.length) {
+
+                    var tasks = q.payload ? q.tasks.splice(0, q.payload) : q.tasks.splice(0, q.tasks.length);
+
+                    var data = arrayMap(tasks, baseProperty('data'));
+
+                    if (q.tasks.length === 0) {
+                        q.empty();
+                    }
+                    workers += 1;
+                    workersList.push(tasks[0]);
+                    var cb = onlyOnce(_next(q, tasks));
+                    worker(data, cb);
+                }
+            },
+            length: function () {
+                return q.tasks.length;
+            },
+            running: function () {
+                return workers;
+            },
+            workersList: function () {
+                return workersList;
+            },
+            idle: function () {
+                return q.tasks.length + workers === 0;
+            },
+            pause: function () {
+                q.paused = true;
+            },
+            resume: function () {
+                if (q.paused === false) {
+                    return;
+                }
+                q.paused = false;
+                var resumeCount = Math.min(q.concurrency, q.tasks.length);
+                // Need to call q.process once per concurrent
+                // worker to preserve full concurrency after pause
+                for (var w = 1; w <= resumeCount; w++) {
+                    setImmediate$1(q.process);
+                }
+            }
+        };
+        return q;
+    }
 
-  var filter = doParallel(_filter);
+    function cargo(worker, payload) {
+        return queue(worker, 1, payload);
+    }
 
-  function doParallelLimit(fn) {
-      return function (obj, limit, iterator, callback) {
-          return fn(_eachOfLimit(limit), obj, iterator, callback);
-      };
-  }
+    function reduce(arr, memo, iterator, cb) {
+        eachOfSeries(arr, function (x, i, cb) {
+            iterator(memo, x, function (err, v) {
+                memo = v;
+                cb(err);
+            });
+        }, function (err) {
+            cb(err, memo);
+        });
+    }
+
+    function seq() /* functions... */{
+        var fns = arguments;
+        return rest(function (args) {
+            var that = this;
+
+            var cb = args[args.length - 1];
+            if (typeof cb == 'function') {
+                args.pop();
+            } else {
+                cb = noop;
+            }
+
+            reduce(fns, args, function (newargs, fn, cb) {
+                fn.apply(that, newargs.concat([rest(function (err, nextargs) {
+                    cb(err, nextargs);
+                })]));
+            }, function (err, results) {
+                cb.apply(that, [err].concat(results));
+            });
+        });
+    }
+
+    var reverse = Array.prototype.reverse;
+
+    function compose() /* functions... */{
+        return seq.apply(null, reverse.call(arguments));
+    }
+
+    function concat$1(eachfn, arr, fn, callback) {
+        var result = [];
+        eachfn(arr, function (x, index, cb) {
+            fn(x, function (err, y) {
+                result = result.concat(y || []);
+                cb(err);
+            });
+        }, function (err) {
+            callback(err, result);
+        });
+    }
+
+    function doParallel(fn) {
+        return function (obj, iterator, callback) {
+            return fn(eachOf, obj, iterator, callback);
+        };
+    }
+
+    var concat = doParallel(concat$1);
+
+    function doSeries(fn) {
+        return function (obj, iterator, callback) {
+            return fn(eachOfSeries, obj, iterator, callback);
+        };
+    }
+
+    var concatSeries = doSeries(concat$1);
+
+    var constant$1 = rest(function (values) {
+        var args = [null].concat(values);
+        return function () {
+            var callback = [].slice.call(arguments).pop();
+            return callback.apply(this, args);
+        };
+    });
+
+    function _createTester(eachfn, check, getResult) {
+        return function (arr, limit, iterator, cb) {
+            function done(err) {
+                if (cb) {
+                    if (err) {
+                        cb(err);
+                    } else {
+                        cb(null, getResult(false));
+                    }
+                }
+            }
+            function iteratee(x, _, callback) {
+                if (!cb) return callback();
+                iterator(x, function (err, v) {
+                    if (cb) {
+                        if (err) {
+                            cb(err);
+                            cb = iterator = false;
+                        } else if (check(v)) {
+                            cb(null, getResult(true, x));
+                            cb = iterator = false;
+                        }
+                    }
+                    callback();
+                });
+            }
+            if (arguments.length > 3) {
+                eachfn(arr, limit, iteratee, done);
+            } else {
+                cb = iterator;
+                iterator = limit;
+                eachfn(arr, iteratee, done);
+            }
+        };
+    }
+
+    function _findGetResult(v, x) {
+        return x;
+    }
+
+    var detect = _createTester(eachOf, identity, _findGetResult);
+
+    var detectLimit = _createTester(eachOfLimit, identity, _findGetResult);
+
+    var detectSeries = _createTester(eachOfSeries, identity, _findGetResult);
+
+    function consoleFunc(name) {
+        return rest(function (fn, args) {
+            fn.apply(null, args.concat([rest(function (err, args) {
+                if (typeof console === 'object') {
+                    if (err) {
+                        if (console.error) {
+                            console.error(err);
+                        }
+                    } else if (console[name]) {
+                        arrayEach(args, function (x) {
+                            console[name](x);
+                        });
+                    }
+                }
+            })]));
+        });
+    }
 
-  var filterLimit = doParallelLimit(_filter);
+    var dir = consoleFunc('dir');
 
-  var filterSeries = doSeries(_filter);
+    function during(test, iterator, cb) {
+        cb = cb || noop;
 
-  function forever(fn, cb) {
-      var done = onlyOnce(cb || noop);
-      var task = ensureAsync(fn);
+        var next = rest(function (err, args) {
+            if (err) {
+                cb(err);
+            } else {
+                args.push(check);
+                test.apply(this, args);
+            }
+        });
 
-      function next(err) {
-          if (err) return done(err);
-          task(next);
+        var check = function (err, truth) {
+            if (err) return cb(err);
+            if (!truth) return cb(null);
+            iterator(next);
+        };
+
+        test(check);
+    }
+
+    function doDuring(iterator, test, cb) {
+        var calls = 0;
+
+        during(function (next) {
+            if (calls++ < 1) return next(null, true);
+            test.apply(this, arguments);
+        }, iterator, cb);
+    }
+
+    function whilst(test, iterator, cb) {
+        cb = cb || noop;
+        if (!test()) return cb(null);
+        var next = rest(function (err, args) {
+            if (err) return cb(err);
+            if (test.apply(this, args)) return iterator(next);
+            cb.apply(null, [null].concat(args));
+        });
+        iterator(next);
+    }
+
+    function doWhilst(iterator, test, cb) {
+        var calls = 0;
+        return whilst(function () {
+            return ++calls <= 1 || test.apply(this, arguments);
+        }, iterator, cb);
+    }
+
+    function doUntil(iterator, test, cb) {
+        return doWhilst(iterator, function () {
+            return !test.apply(this, arguments);
+        }, cb);
+    }
+
+    function _withoutIndex(iterator) {
+        return function (value, index, callback) {
+            return iterator(value, callback);
+        };
+    }
+
+    function eachLimit(arr, limit, iterator, cb) {
+        return _eachOfLimit(limit)(arr, _withoutIndex(iterator), cb);
+    }
+
+    var each = doLimit(eachLimit, Infinity);
+
+    var eachSeries = doLimit(eachLimit, 1);
+
+    function ensureAsync(fn) {
+        return rest(function (args) {
+            var callback = args.pop();
+            var sync = true;
+            args.push(function () {
+                var innerArgs = arguments;
+                if (sync) {
+                    setImmediate$1(function () {
+                        callback.apply(null, innerArgs);
+                    });
+                } else {
+                    callback.apply(null, innerArgs);
+                }
+            });
+            fn.apply(this, args);
+            sync = false;
+        });
+    }
+
+    function notId(v) {
+        return !v;
+    }
+
+    var everyLimit = _createTester(eachOfLimit, notId, notId);
+
+    var every = doLimit(everyLimit, Infinity);
+
+    var everySeries = doLimit(everyLimit, 1);
+
+    function _filter(eachfn, arr, iterator, callback) {
+        var results = [];
+        eachfn(arr, function (x, index, callback) {
+            iterator(x, function (err, v) {
+                if (err) {
+                    callback(err);
+                } else {
+                    if (v) {
+                        results.push({ index: index, value: x });
+                    }
+                    callback();
+                }
+            });
+        }, function (err) {
+            if (err) {
+                callback(err);
+            } else {
+                callback(null, arrayMap(results.sort(function (a, b) {
+                    return a.index - b.index;
+                }), baseProperty('value')));
+            }
+        });
+    }
+
+    function doParallelLimit(fn) {
+        return function (obj, limit, iterator, callback) {
+            return fn(_eachOfLimit(limit), obj, iterator, callback);
+        };
+    }
+
+    var filterLimit = doParallelLimit(_filter);
+
+    var filter = doLimit(filterLimit, Infinity);
+
+    var filterSeries = doLimit(filterLimit, 1);
+
+    function forever(fn, cb) {
+        var done = onlyOnce(cb || noop);
+        var task = ensureAsync(fn);
+
+        function next(err) {
+            if (err) return done(err);
+            task(next);
+        }
+        next();
+    }
+
+    function iterator (tasks) {
+        function makeCallback(index) {
+            function fn() {
+                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);
+    }
+
+    var log = consoleFunc('log');
+
+    function _asyncMap(eachfn, arr, iterator, callback) {
+        callback = once(callback || noop);
+        arr = arr || [];
+        var results = isArrayLike(arr) ? [] : {};
+        eachfn(arr, function (value, index, callback) {
+            iterator(value, function (err, v) {
+                results[index] = v;
+                callback(err);
+            });
+        }, function (err) {
+            callback(err, results);
+        });
+    }
+
+    var mapLimit = doParallelLimit(_asyncMap);
+
+    var map = doLimit(mapLimit, Infinity);
+
+    var mapSeries = doLimit(mapLimit, 1);
+
+    /** `Object#toString` result references. */
+    var symbolTag$2 = '[object Symbol]';
+
+    /** Used for built-in method references. */
+    var objectProto$12 = Object.prototype;
+
+    /**
+     * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+     * of values.
+     */
+    var objectToString$4 = objectProto$12.toString;
+
+    /**
+     * Checks if `value` is classified as a `Symbol` primitive or object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isSymbol(Symbol.iterator);
+     * // => true
+     *
+     * _.isSymbol('abc');
+     * // => false
+     */
+    function isSymbol(value) {
+      return typeof value == 'symbol' ||
+        (isObjectLike(value) && objectToString$4.call(value) == symbolTag$2);
+    }
+
+    /** Used as references for various `Number` constants. */
+    var INFINITY$1 = 1 / 0;
+
+    /** Used to convert symbols to primitives and strings. */
+    var symbolProto$1 = Symbol ? Symbol.prototype : undefined;
+    var symbolToString = symbolProto$1 ? symbolProto$1.toString : undefined;
+    /**
+     * Converts `value` to a string if it's not one. An empty string is returned
+     * for `null` and `undefined` values. The sign of `-0` is preserved.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to process.
+     * @returns {string} Returns the string.
+     * @example
+     *
+     * _.toString(null);
+     * // => ''
+     *
+     * _.toString(-0);
+     * // => '-0'
+     *
+     * _.toString([1, 2, 3]);
+     * // => '1,2,3'
+     */
+    function toString(value) {
+      // Exit early for strings to avoid a performance hit in some environments.
+      if (typeof value == 'string') {
+        return value;
       }
-      next();
-  }
-
-  function iterator (tasks) {
-      function makeCallback(index) {
-          function fn() {
-              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;
+      if (value == null) {
+        return '';
+      }
+      if (isSymbol(value)) {
+        return symbolToString ? symbolToString.call(value) : '';
       }
-      return makeCallback(0);
-  }
-
-  var log = consoleFunc('log');
-
-  function _asyncMap(eachfn, arr, iterator, callback) {
-      callback = once(callback || noop);
-      arr = arr || [];
-      var results = isArrayLike(arr) ? [] : {};
-      eachfn(arr, function (value, index, callback) {
-          iterator(value, function (err, v) {
-              results[index] = v;
-              callback(err);
-          });
-      }, function (err) {
-          callback(err, results);
+      var result = (value + '');
+      return (result == '0' && (1 / value) == -INFINITY$1) ? '-0' : result;
+    }
+
+    /** Used to match property names within property paths. */
+    var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]/g;
+
+    /** Used to match backslashes in property paths. */
+    var reEscapeChar = /\\(\\)?/g;
+
+    /**
+     * Converts `string` to a property path array.
+     *
+     * @private
+     * @param {string} string The string to convert.
+     * @returns {Array} Returns the property path array.
+     */
+    function stringToPath(string) {
+      var result = [];
+      toString(string).replace(rePropName, function(match, number, quote, string) {
+        result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
       });
-  }
-
-  var map = doParallel(_asyncMap);
-
-  var mapLimit = doParallelLimit(_asyncMap);
-
-  var mapSeries = doSeries(_asyncMap);
-
-  /**
-   * Checks if `value` is a global object.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {null|Object} Returns `value` if it's a global object, else `null`.
-   */
-  function checkGlobal(value) {
-    return (value && value.Object === Object) ? value : null;
-  }
-
-  /** Used to determine if values are of the language type `Object`. */
-  var objectTypes = {
-    'function': true,
-    'object': true
-  };
-
-  /** Detect free variable `exports`. */
-  var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) ? exports : null;
-
-  /** Detect free variable `module`. */
-  var freeModule = (objectTypes[typeof module] && module && !module.nodeType) ? module : null;
-
-  /** Detect free variable `global` from Node.js. */
-  var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);
-
-  /** Detect free variable `self`. */
-  var freeSelf = checkGlobal(objectTypes[typeof self] && self);
-
-  /** Detect free variable `window`. */
-  var freeWindow = checkGlobal(objectTypes[typeof window] && window);
-
-  /** Detect `this` as the global object. */
-  var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
-
-  /**
-   * Used as a reference to the global object.
-   *
-   * The `this` value is used if it's the global object to avoid Greasemonkey's
-   * restricted `window` object, otherwise the `window` object is used.
-   */
-  var root = freeGlobal || ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) || freeSelf || thisGlobal || Function('return this')();
-
-  /** Built-in value references. */
-  var Symbol = root.Symbol;
-
-  /** `Object#toString` result references. */
-  var symbolTag = '[object Symbol]';
-
-  /** Used for built-in method references. */
-  var objectProto$5 = Object.prototype;
-
-  /**
-   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
-   * of values.
-   */
-  var objectToString$3 = objectProto$5.toString;
-
-  /**
-   * Checks if `value` is classified as a `Symbol` primitive or object.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isSymbol(Symbol.iterator);
-   * // => true
-   *
-   * _.isSymbol('abc');
-   * // => false
-   */
-  function isSymbol(value) {
-    return typeof value == 'symbol' ||
-      (isObjectLike(value) && objectToString$3.call(value) == symbolTag);
-  }
-
-  /** Used as references for various `Number` constants. */
-  var INFINITY$1 = 1 / 0;
-
-  /** Used to convert symbols to primitives and strings. */
-  var symbolProto = Symbol ? Symbol.prototype : undefined;
-  var symbolToString = Symbol ? symbolProto.toString : undefined;
-  /**
-   * Converts `value` to a string if it's not one. An empty string is returned
-   * for `null` and `undefined` values. The sign of `-0` is preserved.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to process.
-   * @returns {string} Returns the string.
-   * @example
-   *
-   * _.toString(null);
-   * // => ''
-   *
-   * _.toString(-0);
-   * // => '-0'
-   *
-   * _.toString([1, 2, 3]);
-   * // => '1,2,3'
-   */
-  function toString(value) {
-    // Exit early for strings to avoid a performance hit in some environments.
-    if (typeof value == 'string') {
-      return value;
+      return result;
     }
-    if (value == null) {
-      return '';
-    }
-    if (isSymbol(value)) {
-      return Symbol ? symbolToString.call(value) : '';
-    }
-    var result = (value + '');
-    return (result == '0' && (1 / value) == -INFINITY$1) ? '-0' : result;
-  }
-
-  /** Used to match property names within property paths. */
-  var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]/g;
-
-  /** Used to match backslashes in property paths. */
-  var reEscapeChar = /\\(\\)?/g;
-
-  /**
-   * Converts `string` to a property path array.
-   *
-   * @private
-   * @param {string} string The string to convert.
-   * @returns {Array} Returns the property path array.
-   */
-  function stringToPath(string) {
-    var result = [];
-    toString(string).replace(rePropName, function(match, number, quote, string) {
-      result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
-    });
-    return result;
-  }
-
-  /**
-   * The base implementation of `_.toPath` which only converts `value` to a
-   * path if it's not one.
-   *
-   * @private
-   * @param {*} value The value to process.
-   * @returns {Array} Returns the property path array.
-   */
-  function baseToPath(value) {
-    return isArray(value) ? value : stringToPath(value);
-  }
-
-  var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/;
-  var reIsPlainProp = /^\w*$/;
-  /**
-   * Checks if `value` is a property name and not a property path.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @param {Object} [object] The object to query keys on.
-   * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
-   */
-  function isKey(value, object) {
-    if (typeof value == 'number') {
-      return true;
+
+    /**
+     * Casts `value` to a path array if it's not one.
+     *
+     * @private
+     * @param {*} value The value to inspect.
+     * @returns {Array} Returns the cast property path array.
+     */
+    function baseCastPath(value) {
+      return isArray(value) ? value : stringToPath(value);
     }
-    return !isArray(value) &&
-      (reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
-        (object != null && value in Object(object)));
-  }
-
-  /**
-   * Gets the last element of `array`.
-   *
-   * @static
-   * @memberOf _
-   * @category Array
-   * @param {Array} array The array to query.
-   * @returns {*} Returns the last element of `array`.
-   * @example
-   *
-   * _.last([1, 2, 3]);
-   * // => 3
-   */
-  function last(array) {
-    var length = array ? array.length : 0;
-    return length ? array[length - 1] : undefined;
-  }
-
-  /**
-   * The base implementation of `_.slice` without an iteratee call guard.
-   *
-   * @private
-   * @param {Array} array The array to slice.
-   * @param {number} [start=0] The start position.
-   * @param {number} [end=array.length] The end position.
-   * @returns {Array} Returns the slice of `array`.
-   */
-  function baseSlice(array, start, end) {
-    var index = -1,
-        length = array.length;
-
-    if (start < 0) {
-      start = -start > length ? 0 : (length + start);
-    }
-    end = end > length ? length : end;
-    if (end < 0) {
-      end += length;
-    }
-    length = start > end ? 0 : ((end - start) >>> 0);
-    start >>>= 0;
-
-    var result = Array(length);
-    while (++index < length) {
-      result[index] = array[index + start];
-    }
-    return result;
-  }
-
-  /**
-   * The base implementation of `_.get` without support for default values.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @param {Array|string} path The path of the property to get.
-   * @returns {*} Returns the resolved value.
-   */
-  function baseGet(object, path) {
-    path = isKey(path, object) ? [path + ''] : baseToPath(path);
-
-    var index = 0,
-        length = path.length;
-
-    while (object != null && index < length) {
-      object = object[path[index++]];
-    }
-    return (index && index == length) ? object : undefined;
-  }
-
-  /**
-   * Gets the value at `path` of `object`. If the resolved value is
-   * `undefined` the `defaultValue` is used in its place.
-   *
-   * @static
-   * @memberOf _
-   * @category Object
-   * @param {Object} object The object to query.
-   * @param {Array|string} path The path of the property to get.
-   * @param {*} [defaultValue] The value returned if the resolved value is `undefined`.
-   * @returns {*} Returns the resolved value.
-   * @example
-   *
-   * var object = { 'a': [{ 'b': { 'c': 3 } }] };
-   *
-   * _.get(object, 'a[0].b.c');
-   * // => 3
-   *
-   * _.get(object, ['a', '0', 'b', 'c']);
-   * // => 3
-   *
-   * _.get(object, 'a.b.c', 'default');
-   * // => 'default'
-   */
-  function get(object, path, defaultValue) {
-    var result = object == null ? undefined : baseGet(object, path);
-    return result === undefined ? defaultValue : result;
-  }
-
-  /**
-   * Gets the parent value at `path` of `object`.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @param {Array} path The path to get the parent value of.
-   * @returns {*} Returns the parent value.
-   */
-  function parent(object, path) {
-    return path.length == 1 ? object : get(object, baseSlice(path, 0, -1));
-  }
-
-  /**
-   * Checks if `path` exists on `object`.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @param {Array|string} path The path to check.
-   * @param {Function} hasFunc The function to check properties.
-   * @returns {boolean} Returns `true` if `path` exists, else `false`.
-   */
-  function hasPath(object, path, hasFunc) {
-    if (object == null) {
-      return false;
-    }
-    var result = hasFunc(object, path);
-    if (!result && !isKey(path)) {
-      path = baseToPath(path);
-      object = parent(object, path);
-      if (object != null) {
-        path = last(path);
-        result = hasFunc(object, path);
+
+    var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/;
+    var reIsPlainProp = /^\w*$/;
+    /**
+     * Checks if `value` is a property name and not a property path.
+     *
+     * @private
+     * @param {*} value The value to check.
+     * @param {Object} [object] The object to query keys on.
+     * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
+     */
+    function isKey(value, object) {
+      if (typeof value == 'number') {
+        return true;
       }
+      return !isArray(value) &&
+        (reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
+          (object != null && value in Object(object)));
     }
-    var length = object ? object.length : undefined;
-    return result || (
-      !!length && isLength(length) && isIndex(path, length) &&
-      (isArray(object) || isString(object) || isArguments(object))
-    );
-  }
-
-  /**
-   * Checks if `path` is a direct property of `object`.
-   *
-   * @static
-   * @memberOf _
-   * @category Object
-   * @param {Object} object The object to query.
-   * @param {Array|string} path The path to check.
-   * @returns {boolean} Returns `true` if `path` exists, else `false`.
-   * @example
-   *
-   * var object = { 'a': { 'b': { 'c': 3 } } };
-   * var other = _.create({ 'a': _.create({ 'b': _.create({ 'c': 3 }) }) });
-   *
-   * _.has(object, 'a');
-   * // => true
-   *
-   * _.has(object, 'a.b.c');
-   * // => true
-   *
-   * _.has(object, ['a', 'b', 'c']);
-   * // => true
-   *
-   * _.has(other, 'a');
-   * // => false
-   */
-  function has(object, path) {
-    return hasPath(object, path, baseHas);
-  }
-
-  function memoize(fn, hasher) {
-      var memo = Object.create(null);
-      var queues = Object.create(null);
-      hasher = hasher || identity;
-      var memoized = rest(function memoized(args) {
-          var callback = args.pop();
-          var key = hasher.apply(null, args);
-          if (has(memo, key)) {
-              setImmediate$1(function () {
-                  callback.apply(null, memo[key]);
-              });
-          } else if (has(queues, key)) {
-              queues[key].push(callback);
-          } else {
-              queues[key] = [callback];
-              fn.apply(null, args.concat([rest(function (args) {
-                  memo[key] = args;
-                  var q = queues[key];
-                  delete queues[key];
-                  for (var i = 0, l = q.length; i < l; i++) {
-                      q[i].apply(null, args);
-                  }
-              })]));
-          }
-      });
-      memoized.memo = memo;
-      memoized.unmemoized = fn;
-      return memoized;
-  }
-
-  var nexTick = typeof process === 'object' && typeof process.nextTick === 'function' ? process.nextTick : setImmediate$1;
-
-  function _parallel(eachfn, tasks, callback) {
-      callback = callback || noop;
-      var results = isArrayLike(tasks) ? [] : {};
-
-      eachfn(tasks, function (task, key, callback) {
-          task(rest(function (err, args) {
-              if (args.length <= 1) {
-                  args = args[0];
-              }
-              results[key] = args;
-              callback(err);
-          }));
-      }, function (err) {
-          callback(err, results);
-      });
-  }
 
-  function parallel(tasks, cb) {
-      return _parallel(eachOf, tasks, cb);
-  }
+    /**
+     * Gets the last element of `array`.
+     *
+     * @static
+     * @memberOf _
+     * @category Array
+     * @param {Array} array The array to query.
+     * @returns {*} Returns the last element of `array`.
+     * @example
+     *
+     * _.last([1, 2, 3]);
+     * // => 3
+     */
+    function last(array) {
+      var length = array ? array.length : 0;
+      return length ? array[length - 1] : undefined;
+    }
 
-  function parallelLimit(tasks, limit, cb) {
-      return _parallel(_eachOfLimit(limit), tasks, cb);
-  }
+    /**
+     * The base implementation of `_.slice` without an iteratee call guard.
+     *
+     * @private
+     * @param {Array} array The array to slice.
+     * @param {number} [start=0] The start position.
+     * @param {number} [end=array.length] The end position.
+     * @returns {Array} Returns the slice of `array`.
+     */
+    function baseSlice(array, start, end) {
+      var index = -1,
+          length = array.length;
 
-  function queue (worker, concurrency) {
-      return queue$1(function (items, cb) {
-          worker(items[0], cb);
-      }, concurrency, 1);
-  }
+      if (start < 0) {
+        start = -start > length ? 0 : (length + start);
+      }
+      end = end > length ? length : end;
+      if (end < 0) {
+        end += length;
+      }
+      length = start > end ? 0 : ((end - start) >>> 0);
+      start >>>= 0;
 
-  function priorityQueue (worker, concurrency) {
-      function _compareTasks(a, b) {
-          return a.priority - b.priority;
+      var result = Array(length);
+      while (++index < length) {
+        result[index] = array[index + start];
       }
+      return result;
+    }
 
-      function _binarySearch(sequence, item, compare) {
-          var beg = -1,
-              end = sequence.length - 1;
-          while (beg < end) {
-              var mid = beg + (end - beg + 1 >>> 1);
-              if (compare(item, sequence[mid]) >= 0) {
-                  beg = mid;
-              } else {
-                  end = mid - 1;
-              }
-          }
-          return beg;
+    /**
+     * The base implementation of `_.get` without support for default values.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path of the property to get.
+     * @returns {*} Returns the resolved value.
+     */
+    function baseGet(object, path) {
+      path = isKey(path, object) ? [path + ''] : baseCastPath(path);
+
+      var index = 0,
+          length = path.length;
+
+      while (object != null && index < length) {
+        object = object[path[index++]];
       }
+      return (index && index == length) ? object : undefined;
+    }
 
-      function _insert(q, data, priority, callback) {
-          if (callback != null && typeof callback !== 'function') {
-              throw new Error('task callback must be a function');
-          }
-          q.started = true;
-          if (!isArray(data)) {
-              data = [data];
-          }
-          if (data.length === 0) {
-              // call drain immediately if there are no tasks
-              return setImmediate$1(function () {
-                  q.drain();
-              });
-          }
-          arrayEach(data, function (task) {
-              var item = {
-                  data: task,
-                  priority: priority,
-                  callback: typeof callback === 'function' ? callback : noop
-              };
-
-              q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
-
-              if (q.tasks.length === q.concurrency) {
-                  q.saturated();
-              }
-              setImmediate$1(q.process);
-          });
+    /**
+     * Gets the value at `path` of `object`. If the resolved value is
+     * `undefined` the `defaultValue` is used in its place.
+     *
+     * @static
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path of the property to get.
+     * @param {*} [defaultValue] The value returned if the resolved value is `undefined`.
+     * @returns {*} Returns the resolved value.
+     * @example
+     *
+     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+     *
+     * _.get(object, 'a[0].b.c');
+     * // => 3
+     *
+     * _.get(object, ['a', '0', 'b', 'c']);
+     * // => 3
+     *
+     * _.get(object, 'a.b.c', 'default');
+     * // => 'default'
+     */
+    function get(object, path, defaultValue) {
+      var result = object == null ? undefined : baseGet(object, path);
+      return result === undefined ? defaultValue : result;
+    }
+
+    /**
+     * Gets the parent value at `path` of `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array} path The path to get the parent value of.
+     * @returns {*} Returns the parent value.
+     */
+    function parent(object, path) {
+      return path.length == 1 ? object : get(object, baseSlice(path, 0, -1));
+    }
+
+    /**
+     * Checks if `path` exists on `object`.
+     *
+     * @private
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path to check.
+     * @param {Function} hasFunc The function to check properties.
+     * @returns {boolean} Returns `true` if `path` exists, else `false`.
+     */
+    function hasPath(object, path, hasFunc) {
+      if (object == null) {
+        return false;
+      }
+      var result = hasFunc(object, path);
+      if (!result && !isKey(path)) {
+        path = baseCastPath(path);
+        object = parent(object, path);
+        if (object != null) {
+          path = last(path);
+          result = hasFunc(object, path);
+        }
       }
+      var length = object ? object.length : undefined;
+      return result || (
+        !!length && isLength(length) && isIndex(path, length) &&
+        (isArray(object) || isString(object) || isArguments(object))
+      );
+    }
 
-      // Start with a normal queue
-      var q = queue(worker, concurrency);
+    /**
+     * Checks if `path` is a direct property of `object`.
+     *
+     * @static
+     * @memberOf _
+     * @category Object
+     * @param {Object} object The object to query.
+     * @param {Array|string} path The path to check.
+     * @returns {boolean} Returns `true` if `path` exists, else `false`.
+     * @example
+     *
+     * var object = { 'a': { 'b': { 'c': 3 } } };
+     * var other = _.create({ 'a': _.create({ 'b': _.create({ 'c': 3 }) }) });
+     *
+     * _.has(object, 'a');
+     * // => true
+     *
+     * _.has(object, 'a.b.c');
+     * // => true
+     *
+     * _.has(object, ['a', 'b', 'c']);
+     * // => true
+     *
+     * _.has(other, 'a');
+     * // => false
+     */
+    function has(object, path) {
+      return hasPath(object, path, baseHas);
+    }
 
-      // Override push to accept second parameter representing priority
-      q.push = function (data, priority, callback) {
-          _insert(q, data, priority, callback);
-      };
+    function memoize(fn, hasher) {
+        var memo = Object.create(null);
+        var queues = Object.create(null);
+        hasher = hasher || identity;
+        var memoized = rest(function memoized(args) {
+            var callback = args.pop();
+            var key = hasher.apply(null, args);
+            if (has(memo, key)) {
+                setImmediate$1(function () {
+                    callback.apply(null, memo[key]);
+                });
+            } else if (has(queues, key)) {
+                queues[key].push(callback);
+            } else {
+                queues[key] = [callback];
+                fn.apply(null, args.concat([rest(function (args) {
+                    memo[key] = args;
+                    var q = queues[key];
+                    delete queues[key];
+                    for (var i = 0, l = q.length; i < l; i++) {
+                        q[i].apply(null, args);
+                    }
+                })]));
+            }
+        });
+        memoized.memo = memo;
+        memoized.unmemoized = fn;
+        return memoized;
+    }
 
-      // Remove unshift function
-      delete q.unshift;
+    function _parallel(eachfn, tasks, callback) {
+        callback = callback || noop;
+        var results = isArrayLike(tasks) ? [] : {};
+
+        eachfn(tasks, function (task, key, callback) {
+            task(rest(function (err, args) {
+                if (args.length <= 1) {
+                    args = args[0];
+                }
+                results[key] = args;
+                callback(err);
+            }));
+        }, function (err) {
+            callback(err, results);
+        });
+    }
 
-      return q;
-  }
+    function parallelLimit(tasks, limit, cb) {
+        return _parallel(_eachOfLimit(limit), tasks, cb);
+    }
 
-  var slice = Array.prototype.slice;
+    var parallel = doLimit(parallelLimit, Infinity);
 
-  function reduceRight(arr, memo, iterator, cb) {
-      var reversed = slice.call(arr).reverse();
-      reduce(reversed, memo, iterator, cb);
-  }
+    function queue$1 (worker, concurrency) {
+        return queue(function (items, cb) {
+            worker(items[0], cb);
+        }, concurrency, 1);
+    }
 
-  function reject$1(eachfn, arr, iterator, callback) {
-      _filter(eachfn, arr, function (value, cb) {
-          iterator(value, function (err, v) {
-              if (err) {
-                  cb(err);
-              } else {
-                  cb(null, !v);
-              }
-          });
-      }, callback);
-  }
+    function priorityQueue (worker, concurrency) {
+        function _compareTasks(a, b) {
+            return a.priority - b.priority;
+        }
 
-  var reject = doParallel(reject$1);
+        function _binarySearch(sequence, item, compare) {
+            var beg = -1,
+                end = sequence.length - 1;
+            while (beg < end) {
+                var mid = beg + (end - beg + 1 >>> 1);
+                if (compare(item, sequence[mid]) >= 0) {
+                    beg = mid;
+                } else {
+                    end = mid - 1;
+                }
+            }
+            return beg;
+        }
 
-  var rejectLimit = doParallelLimit(reject$1);
+        function _insert(q, data, priority, callback) {
+            if (callback != null && typeof callback !== 'function') {
+                throw new Error('task callback must be a function');
+            }
+            q.started = true;
+            if (!isArray(data)) {
+                data = [data];
+            }
+            if (data.length === 0) {
+                // call drain immediately if there are no tasks
+                return setImmediate$1(function () {
+                    q.drain();
+                });
+            }
+            arrayEach(data, function (task) {
+                var item = {
+                    data: task,
+                    priority: priority,
+                    callback: typeof callback === 'function' ? callback : noop
+                };
+
+                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);
+            });
+        }
 
-  var rejectSeries = doSeries(reject$1);
+        // Start with a normal queue
+        var q = queue$1(worker, concurrency);
 
-  function series(tasks, cb) {
-      return _parallel(eachOfSeries, tasks, cb);
-  }
+        // Override push to accept second parameter representing priority
+        q.push = function (data, priority, callback) {
+            _insert(q, data, priority, callback);
+        };
 
-  function retry(times, task, callback) {
-      var DEFAULT_TIMES = 5;
-      var DEFAULT_INTERVAL = 0;
+        // Remove unshift function
+        delete q.unshift;
 
-      var attempts = [];
+        return q;
+    }
 
-      var opts = {
-          times: DEFAULT_TIMES,
-          interval: DEFAULT_INTERVAL
-      };
+    /**
+     * Creates a `baseEach` or `baseEachRight` function.
+     *
+     * @private
+     * @param {Function} eachFunc The function to iterate over a collection.
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Function} Returns the new base function.
+     */
+    function createBaseEach(eachFunc, fromRight) {
+      return function(collection, iteratee) {
+        if (collection == null) {
+          return collection;
+        }
+        if (!isArrayLike(collection)) {
+          return eachFunc(collection, iteratee);
+        }
+        var length = collection.length,
+            index = fromRight ? length : -1,
+            iterable = Object(collection);
 
-      function parseTimes(acc, t) {
-          if (typeof t === 'number') {
-              acc.times = parseInt(t, 10) || DEFAULT_TIMES;
-          } else if (typeof t === 'object') {
-              acc.times = parseInt(t.times, 10) || DEFAULT_TIMES;
-              acc.interval = parseInt(t.interval, 10) || DEFAULT_INTERVAL;
-          } else {
-              throw new Error('Unsupported argument type for \'times\': ' + typeof t);
+        while ((fromRight ? index-- : ++index < length)) {
+          if (iteratee(iterable[index], index, iterable) === false) {
+            break;
           }
-      }
+        }
+        return collection;
+      };
+    }
 
-      var length = arguments.length;
-      if (length < 1 || length > 3) {
-          throw new Error('Invalid arguments - must be either (task), (task, callback), (times, task) or (times, task, callback)');
-      } else if (length <= 2 && typeof times === 'function') {
-          callback = task;
-          task = times;
-      }
-      if (typeof times !== 'function') {
-          parseTimes(opts, times);
-      }
-      opts.callback = callback;
-      opts.task = task;
-
-      function wrappedTask(wrappedCallback, wrappedResults) {
-          function retryAttempt(task, finalAttempt) {
-              return function (seriesCallback) {
-                  task(function (err, result) {
-                      seriesCallback(!err || finalAttempt, {
-                          err: err,
-                          result: result
-                      });
-                  }, wrappedResults);
-              };
-          }
+    /**
+     * The base implementation of `_.forEach` without support for iteratee shorthands.
+     *
+     * @private
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} iteratee The function invoked per iteration.
+     * @returns {Array|Object} Returns `collection`.
+     */
+    var baseEach = createBaseEach(baseForOwn);
+
+    /**
+     * Iterates over elements of `collection` invoking `iteratee` for each element.
+     * The iteratee is invoked with three arguments: (value, index|key, collection).
+     * Iteratee functions may exit iteration early by explicitly returning `false`.
+     *
+     * **Note:** As with other "Collections" methods, objects with a "length" property
+     * are iterated like arrays. To avoid this behavior use `_.forIn` or `_.forOwn`
+     * for object iteration.
+     *
+     * @static
+     * @memberOf _
+     * @alias each
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array|Object} Returns `collection`.
+     * @example
+     *
+     * _([1, 2]).forEach(function(value) {
+     *   console.log(value);
+     * });
+     * // => logs `1` then `2`
+     *
+     * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
+     *   console.log(key);
+     * });
+     * // => logs 'a' then 'b' (iteration order is not guaranteed)
+     */
+    function forEach(collection, iteratee) {
+      return (typeof iteratee == 'function' && isArray(collection))
+        ? arrayEach(collection, iteratee)
+        : baseEach(collection, baseCastFunction(iteratee));
+    }
 
-          function retryInterval(interval) {
-              return function (seriesCallback) {
-                  setTimeout(function () {
-                      seriesCallback(null);
-                  }, interval);
-              };
-          }
+    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'));
+        if (!tasks.length) return cb();
+        forEach(tasks, function (task) {
+            task(cb);
+        });
+    }
 
-          while (opts.times) {
+    var slice = Array.prototype.slice;
 
-              var finalAttempt = !(opts.times -= 1);
-              attempts.push(retryAttempt(opts.task, finalAttempt));
-              if (!finalAttempt && opts.interval > 0) {
-                  attempts.push(retryInterval(opts.interval));
-              }
-          }
+    function reduceRight(arr, memo, iterator, cb) {
+        var reversed = slice.call(arr).reverse();
+        reduce(reversed, memo, iterator, cb);
+    }
 
-          series(attempts, function (done, data) {
-              data = data[data.length - 1];
-              (wrappedCallback || opts.callback)(data.err, data.result);
-          });
-      }
+    function reject$1(eachfn, arr, iterator, callback) {
+        _filter(eachfn, arr, function (value, cb) {
+            iterator(value, function (err, v) {
+                if (err) {
+                    cb(err);
+                } else {
+                    cb(null, !v);
+                }
+            });
+        }, callback);
+    }
 
-      // If a callback is passed, run this as a controll flow
-      return opts.callback ? wrappedTask() : wrappedTask;
-  }
+    var rejectLimit = doParallelLimit(reject$1);
 
-  var some = _createTester(eachOf, Boolean, identity);
+    var reject = doLimit(rejectLimit, Infinity);
 
-  var someLimit = _createTester(eachOfLimit, Boolean, identity);
+    var rejectSeries = doLimit(rejectLimit, 1);
 
-  function sortBy(arr, iterator, cb) {
-      map(arr, function (x, cb) {
-          iterator(x, function (err, criteria) {
-              if (err) return cb(err);
-              cb(null, { value: x, criteria: criteria });
-          });
-      }, function (err, results) {
-          if (err) return cb(err);
-          cb(null, arrayMap(results.sort(comparator), baseProperty('value')));
-      });
+    function series(tasks, cb) {
+        return _parallel(eachOfSeries, tasks, cb);
+    }
 
-      function comparator(left, right) {
-          var a = left.criteria,
-              b = right.criteria;
-          return a < b ? -1 : a > b ? 1 : 0;
-      }
-  }
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeCeil = Math.ceil;
-  var nativeMax$2 = Math.max;
-  /**
-   * The base implementation of `_.range` and `_.rangeRight` which doesn't
-   * coerce arguments to numbers.
-   *
-   * @private
-   * @param {number} start The start of the range.
-   * @param {number} end The end of the range.
-   * @param {number} step The value to increment or decrement by.
-   * @param {boolean} [fromRight] Specify iterating from right to left.
-   * @returns {Array} Returns the new array of numbers.
-   */
-  function baseRange(start, end, step, fromRight) {
-    var index = -1,
-        length = nativeMax$2(nativeCeil((end - start) / (step || 1)), 0),
-        result = Array(length);
-
-    while (length--) {
-      result[fromRight ? length : ++index] = start;
-      start += step;
-    }
-    return result;
-  }
-
-  function times (count, iterator, callback) {
-      map(baseRange(0, count, 1), iterator, callback);
-  }
-
-  function timeLimit(count, limit, iterator, cb) {
-      return mapLimit(baseRange(0, count, 1), limit, iterator, cb);
-  }
-
-  function timesSeries (count, iterator, callback) {
-      mapSeries(baseRange(0, count, 1), iterator, callback);
-  }
-
-  function transform(arr, memo, iterator, callback) {
-      if (arguments.length === 3) {
-          callback = iterator;
-          iterator = memo;
-          memo = isArray(arr) ? [] : {};
-      }
+    function retry(times, task, callback) {
+        var DEFAULT_TIMES = 5;
+        var DEFAULT_INTERVAL = 0;
+
+        var opts = {
+            times: DEFAULT_TIMES,
+            interval: DEFAULT_INTERVAL
+        };
+
+        function parseTimes(acc, t) {
+            if (typeof t === 'object') {
+                acc.times = +t.times || DEFAULT_TIMES;
+                acc.interval = +t.interval || DEFAULT_INTERVAL;
+            } else if (typeof t === 'number' || typeof t === 'string') {
+                acc.times = +t || DEFAULT_TIMES;
+            } else {
+                throw new Error("Invalid arguments for async.retry");
+            }
+        }
 
-      eachOf(arr, function (v, k, cb) {
-          iterator(memo, v, k, cb);
-      }, function (err) {
-          callback(err, memo);
-      });
-  }
+        if (arguments.length < 3 && typeof times === 'function') {
+            callback = task || noop;
+            task = times;
+        } else {
+            parseTimes(opts, times);
+            callback = callback || noop;
+        }
 
-  function unmemoize(fn) {
-      return function () {
-          return (fn.unmemoized || fn).apply(null, arguments);
-      };
-  }
-
-  function until(test, iterator, cb) {
-      return whilst(function () {
-          return !test.apply(this, arguments);
-      }, iterator, cb);
-  }
-
-  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'));
-      if (!tasks.length) return cb();
-
-      function wrapIterator(iterator) {
-          return rest(function (err, args) {
-              if (err) {
-                  cb.apply(null, [err].concat(args));
-              } else {
-                  var next = iterator.next();
-                  if (next) {
-                      args.push(wrapIterator(next));
-                  } else {
-                      args.push(cb);
-                  }
-                  ensureAsync(iterator).apply(null, args);
-              }
-          });
+        if (typeof task !== 'function') {
+            throw new Error("Invalid arguments for async.retry");
+        }
+
+        var attempts = [];
+        while (opts.times) {
+            var isFinalAttempt = !(opts.times -= 1);
+            attempts.push(retryAttempt(isFinalAttempt));
+            if (!isFinalAttempt && opts.interval > 0) {
+                attempts.push(retryInterval(opts.interval));
+            }
+        }
+
+        series(attempts, function (done, data) {
+            data = data[data.length - 1];
+            callback(data.err, data.result);
+        });
+
+        function retryAttempt(isFinalAttempt) {
+            return function (seriesCallback) {
+                task(function (err, result) {
+                    seriesCallback(!err || isFinalAttempt, {
+                        err: err,
+                        result: result
+                    });
+                });
+            };
+        }
+
+        function retryInterval(interval) {
+            return function (seriesCallback) {
+                setTimeout(function () {
+                    seriesCallback(null);
+                }, interval);
+            };
+        }
+    }
+
+    var someLimit = _createTester(eachOfLimit, Boolean, identity);
+
+    var some = doLimit(someLimit, Infinity);
+
+    var someSeries = doLimit(someLimit, 1);
+
+    function sortBy(arr, iterator, cb) {
+        map(arr, function (x, cb) {
+            iterator(x, function (err, criteria) {
+                if (err) return cb(err);
+                cb(null, { value: x, criteria: criteria });
+            });
+        }, function (err, results) {
+            if (err) return cb(err);
+            cb(null, arrayMap(results.sort(comparator), baseProperty('value')));
+        });
+
+        function comparator(left, right) {
+            var a = left.criteria,
+                b = right.criteria;
+            return a < b ? -1 : a > b ? 1 : 0;
+        }
+    }
+
+    function timeout(asyncFn, miliseconds) {
+        var originalCallback, timer;
+        var timedOut = false;
+
+        function injectedCallback() {
+            if (!timedOut) {
+                originalCallback.apply(null, arguments);
+                clearTimeout(timer);
+            }
+        }
+
+        function timeoutCallback() {
+            var error = new Error('Callback function timed out.');
+            error.code = 'ETIMEDOUT';
+            timedOut = true;
+            originalCallback(error);
+        }
+
+        function injectCallback(asyncFnArgs) {
+            // replace callback in asyncFn args
+            var args = Array.prototype.slice.call(asyncFnArgs, 0);
+            originalCallback = args[args.length - 1];
+            args[args.length - 1] = injectedCallback;
+            return args;
+        }
+
+        function wrappedFn() {
+            // setup timer and call original function
+            timer = setTimeout(timeoutCallback, miliseconds);
+            asyncFn.apply(null, injectCallback(arguments));
+        }
+
+        return wrappedFn;
+    }
+
+    /* Built-in method references for those with the same name as other `lodash` methods. */
+    var nativeCeil = Math.ceil;
+    var nativeMax$2 = Math.max;
+    /**
+     * The base implementation of `_.range` and `_.rangeRight` which doesn't
+     * coerce arguments to numbers.
+     *
+     * @private
+     * @param {number} start The start of the range.
+     * @param {number} end The end of the range.
+     * @param {number} step The value to increment or decrement by.
+     * @param {boolean} [fromRight] Specify iterating from right to left.
+     * @returns {Array} Returns the new array of numbers.
+     */
+    function baseRange(start, end, step, fromRight) {
+      var index = -1,
+          length = nativeMax$2(nativeCeil((end - start) / (step || 1)), 0),
+          result = Array(length);
+
+      while (length--) {
+        result[fromRight ? length : ++index] = start;
+        start += step;
       }
-      wrapIterator(iterator(tasks))();
-  }
-
-  var index = {
-      applyEach: applyEach,
-      applyEachSeries: applyEachSeries,
-      apply: apply,
-      asyncify: asyncify,
-      auto: auto,
-      cargo: cargo,
-      compose: compose,
-      concat: concat,
-      concatSeries: concatSeries,
-      constant: constant,
-      detect: detect,
-      detectLimit: detectLimit,
-      detectSeries: detectSeries,
-      dir: dir,
-      doDuring: doDuring,
-      doUntil: doUntil,
-      doWhilst: doWhilst,
-      during: during,
-      each: each,
-      eachLimit: eachLimit,
-      eachOf: eachOf,
-      eachOfLimit: eachOfLimit,
-      eachOfSeries: eachOfSeries,
-      eachSeries: eachSeries,
-      ensureAsync: ensureAsync,
-      every: every,
-      everyLimit: everyLimit,
-      filter: filter,
-      filterLimit: filterLimit,
-      filterSeries: filterSeries,
-      forever: forever,
-      iterator: iterator,
-      log: log,
-      map: map,
-      mapLimit: mapLimit,
-      mapSeries: mapSeries,
-      memoize: memoize,
-      nextTick: nexTick,
-      parallel: parallel,
-      parallelLimit: parallelLimit,
-      priorityQueue: priorityQueue,
-      queue: queue,
-      reduce: reduce,
-      reduceRight: reduceRight,
-      reject: reject,
-      rejectLimit: rejectLimit,
-      rejectSeries: rejectSeries,
-      retry: retry,
-      seq: seq,
-      series: series,
-      setImmediate: setImmediate$1,
-      some: some,
-      someLimit: someLimit,
-      sortBy: sortBy,
-      times: times,
-      timesLimit: timeLimit,
-      timesSeries: timesSeries,
-      transform: transform,
-      unmemoize: unmemoize,
-      until: until,
-      waterfall: waterfall,
-      whilst: whilst,
-
-      // aliases
-      all: every,
-      any: some,
-      forEach: each,
-      forEachSeries: eachSeries,
-      forEachLimit: eachLimit,
-      forEachOf: eachOf,
-      forEachOfSeries: eachOfSeries,
-      forEachOfLimit: eachOfLimit,
-      inject: reduce,
-      foldl: reduce,
-      foldr: reduceRight,
-      select: filter,
-      selectLimit: filterLimit,
-      selectSeries: filterSeries,
-      wrapSync: asyncify
-  };
-
-  exports['default'] = index;
-  exports.applyEach = applyEach;
-  exports.applyEachSeries = applyEachSeries;
-  exports.apply = apply;
-  exports.asyncify = asyncify;
-  exports.auto = auto;
-  exports.cargo = cargo;
-  exports.compose = compose;
-  exports.concat = concat;
-  exports.concatSeries = concatSeries;
-  exports.constant = constant;
-  exports.detect = detect;
-  exports.detectLimit = detectLimit;
-  exports.detectSeries = detectSeries;
-  exports.dir = dir;
-  exports.doDuring = doDuring;
-  exports.doUntil = doUntil;
-  exports.doWhilst = doWhilst;
-  exports.during = during;
-  exports.each = each;
-  exports.eachLimit = eachLimit;
-  exports.eachOf = eachOf;
-  exports.eachOfLimit = eachOfLimit;
-  exports.eachOfSeries = eachOfSeries;
-  exports.eachSeries = eachSeries;
-  exports.ensureAsync = ensureAsync;
-  exports.every = every;
-  exports.everyLimit = everyLimit;
-  exports.filter = filter;
-  exports.filterLimit = filterLimit;
-  exports.filterSeries = filterSeries;
-  exports.forever = forever;
-  exports.iterator = iterator;
-  exports.log = log;
-  exports.map = map;
-  exports.mapLimit = mapLimit;
-  exports.mapSeries = mapSeries;
-  exports.memoize = memoize;
-  exports.nextTick = nexTick;
-  exports.parallel = parallel;
-  exports.parallelLimit = parallelLimit;
-  exports.priorityQueue = priorityQueue;
-  exports.queue = queue;
-  exports.reduce = reduce;
-  exports.reduceRight = reduceRight;
-  exports.reject = reject;
-  exports.rejectLimit = rejectLimit;
-  exports.rejectSeries = rejectSeries;
-  exports.retry = retry;
-  exports.seq = seq;
-  exports.series = series;
-  exports.setImmediate = setImmediate$1;
-  exports.some = some;
-  exports.someLimit = someLimit;
-  exports.sortBy = sortBy;
-  exports.times = times;
-  exports.timesLimit = timeLimit;
-  exports.timesSeries = timesSeries;
-  exports.transform = transform;
-  exports.unmemoize = unmemoize;
-  exports.until = until;
-  exports.waterfall = waterfall;
-  exports.whilst = whilst;
-  exports.all = every;
-  exports.any = some;
-  exports.forEach = each;
-  exports.forEachSeries = eachSeries;
-  exports.forEachLimit = eachLimit;
-  exports.forEachOf = eachOf;
-  exports.forEachOfSeries = eachOfSeries;
-  exports.forEachOfLimit = eachOfLimit;
-  exports.inject = reduce;
-  exports.foldl = reduce;
-  exports.foldr = reduceRight;
-  exports.select = filter;
-  exports.selectLimit = filterLimit;
-  exports.selectSeries = filterSeries;
-  exports.wrapSync = asyncify;
+      return result;
+    }
+
+    function timeLimit(count, limit, iterator, cb) {
+        return mapLimit(baseRange(0, count, 1), limit, iterator, cb);
+    }
+
+    var times = doLimit(timeLimit, Infinity);
+
+    var timesSeries = doLimit(timeLimit, 1);
+
+    function transform(arr, memo, iterator, callback) {
+        if (arguments.length === 3) {
+            callback = iterator;
+            iterator = memo;
+            memo = isArray(arr) ? [] : {};
+        }
+
+        eachOf(arr, function (v, k, cb) {
+            iterator(memo, v, k, cb);
+        }, function (err) {
+            callback(err, memo);
+        });
+    }
+
+    function unmemoize(fn) {
+        return function () {
+            return (fn.unmemoized || fn).apply(null, arguments);
+        };
+    }
+
+    function until(test, iterator, cb) {
+        return whilst(function () {
+            return !test.apply(this, arguments);
+        }, iterator, cb);
+    }
+
+    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'));
+        if (!tasks.length) return cb();
+        var taskIndex = 0;
+
+        function nextTask(args) {
+            if (taskIndex === tasks.length) {
+                return cb.apply(null, [null].concat(args));
+            }
+
+            var taskCallback = onlyOnce(rest(function (err, args) {
+                if (err) {
+                    return cb.apply(null, [err].concat(args));
+                }
+                nextTask(args);
+            }));
+
+            args.push(taskCallback);
+
+            var task = tasks[taskIndex++];
+            task.apply(null, args);
+        }
+
+        nextTask([]);
+    }
+
+    var index = {
+        applyEach: applyEach,
+        applyEachSeries: applyEachSeries,
+        apply: apply$1,
+        asyncify: asyncify,
+        auto: auto,
+        autoInject: autoInject,
+        cargo: cargo,
+        compose: compose,
+        concat: concat,
+        concatSeries: concatSeries,
+        constant: constant$1,
+        detect: detect,
+        detectLimit: detectLimit,
+        detectSeries: detectSeries,
+        dir: dir,
+        doDuring: doDuring,
+        doUntil: doUntil,
+        doWhilst: doWhilst,
+        during: during,
+        each: each,
+        eachLimit: eachLimit,
+        eachOf: eachOf,
+        eachOfLimit: eachOfLimit,
+        eachOfSeries: eachOfSeries,
+        eachSeries: eachSeries,
+        ensureAsync: ensureAsync,
+        every: every,
+        everyLimit: everyLimit,
+        everySeries: everySeries,
+        filter: filter,
+        filterLimit: filterLimit,
+        filterSeries: filterSeries,
+        forever: forever,
+        iterator: iterator,
+        log: log,
+        map: map,
+        mapLimit: mapLimit,
+        mapSeries: mapSeries,
+        memoize: memoize,
+        nextTick: setImmediate$1,
+        parallel: parallel,
+        parallelLimit: parallelLimit,
+        priorityQueue: priorityQueue,
+        queue: queue$1,
+        race: race,
+        reduce: reduce,
+        reduceRight: reduceRight,
+        reject: reject,
+        rejectLimit: rejectLimit,
+        rejectSeries: rejectSeries,
+        retry: retry,
+        seq: seq,
+        series: series,
+        setImmediate: setImmediate$1,
+        some: some,
+        someLimit: someLimit,
+        someSeries: someSeries,
+        sortBy: sortBy,
+        timeout: timeout,
+        times: times,
+        timesLimit: timeLimit,
+        timesSeries: timesSeries,
+        transform: transform,
+        unmemoize: unmemoize,
+        until: until,
+        waterfall: waterfall,
+        whilst: whilst,
+
+        // aliases
+        all: every,
+        any: some,
+        forEach: each,
+        forEachSeries: eachSeries,
+        forEachLimit: eachLimit,
+        forEachOf: eachOf,
+        forEachOfSeries: eachOfSeries,
+        forEachOfLimit: eachOfLimit,
+        inject: reduce,
+        foldl: reduce,
+        foldr: reduceRight,
+        select: filter,
+        selectLimit: filterLimit,
+        selectSeries: filterSeries,
+        wrapSync: asyncify
+    };
+
+    exports['default'] = index;
+    exports.applyEach = applyEach;
+    exports.applyEachSeries = applyEachSeries;
+    exports.apply = apply$1;
+    exports.asyncify = asyncify;
+    exports.auto = auto;
+    exports.autoInject = autoInject;
+    exports.cargo = cargo;
+    exports.compose = compose;
+    exports.concat = concat;
+    exports.concatSeries = concatSeries;
+    exports.constant = constant$1;
+    exports.detect = detect;
+    exports.detectLimit = detectLimit;
+    exports.detectSeries = detectSeries;
+    exports.dir = dir;
+    exports.doDuring = doDuring;
+    exports.doUntil = doUntil;
+    exports.doWhilst = doWhilst;
+    exports.during = during;
+    exports.each = each;
+    exports.eachLimit = eachLimit;
+    exports.eachOf = eachOf;
+    exports.eachOfLimit = eachOfLimit;
+    exports.eachOfSeries = eachOfSeries;
+    exports.eachSeries = eachSeries;
+    exports.ensureAsync = ensureAsync;
+    exports.every = every;
+    exports.everyLimit = everyLimit;
+    exports.everySeries = everySeries;
+    exports.filter = filter;
+    exports.filterLimit = filterLimit;
+    exports.filterSeries = filterSeries;
+    exports.forever = forever;
+    exports.iterator = iterator;
+    exports.log = log;
+    exports.map = map;
+    exports.mapLimit = mapLimit;
+    exports.mapSeries = mapSeries;
+    exports.memoize = memoize;
+    exports.nextTick = setImmediate$1;
+    exports.parallel = parallel;
+    exports.parallelLimit = parallelLimit;
+    exports.priorityQueue = priorityQueue;
+    exports.queue = queue$1;
+    exports.race = race;
+    exports.reduce = reduce;
+    exports.reduceRight = reduceRight;
+    exports.reject = reject;
+    exports.rejectLimit = rejectLimit;
+    exports.rejectSeries = rejectSeries;
+    exports.retry = retry;
+    exports.seq = seq;
+    exports.series = series;
+    exports.setImmediate = setImmediate$1;
+    exports.some = some;
+    exports.someLimit = someLimit;
+    exports.someSeries = someSeries;
+    exports.sortBy = sortBy;
+    exports.timeout = timeout;
+    exports.times = times;
+    exports.timesLimit = timeLimit;
+    exports.timesSeries = timesSeries;
+    exports.transform = transform;
+    exports.unmemoize = unmemoize;
+    exports.until = until;
+    exports.waterfall = waterfall;
+    exports.whilst = whilst;
+    exports.all = every;
+    exports.allLimit = everyLimit;
+    exports.allSeries = everySeries;
+    exports.any = some;
+    exports.anyLimit = someLimit;
+    exports.anySeries = someSeries;
+    exports.find = detect;
+    exports.findLimit = detectLimit;
+    exports.findSeries = detectSeries;
+    exports.forEach = each;
+    exports.forEachSeries = eachSeries;
+    exports.forEachLimit = eachLimit;
+    exports.forEachOf = eachOf;
+    exports.forEachOfSeries = eachOfSeries;
+    exports.forEachOfLimit = eachOfLimit;
+    exports.inject = reduce;
+    exports.foldl = reduce;
+    exports.foldr = reduceRight;
+    exports.select = filter;
+    exports.selectLimit = filterLimit;
+    exports.selectSeries = filterSeries;
+    exports.wrapSync = asyncify;
 
 }));
\ No newline at end of file
diff --git a/dist/async.min.js b/dist/async.min.js
index 2915a67..49eb539 100644
--- a/dist/async.min.js
+++ b/dist/async.min.js
@@ -1,2 +1,2 @@
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\ No newline at end of file
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