Vendor testify

Add testify as test helpers

48 files changed, 11112 insertions, 0 deletions

diff --git a/go/vendor/github.com/davecgh/go-spew/LICENSE b/go/vendor/github.com/davecgh/go-spew/LICENSE
new file mode 100644
index 0000000..bc52e96
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/LICENSE
@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2012-2016 Dave Collins <dave@davec.name>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/bypass.go b/go/vendor/github.com/davecgh/go-spew/spew/bypass.go
new file mode 100644
index 0000000..7929947
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/bypass.go
@@ -0,0 +1,145 @@
+// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when the code is not running on Google App Engine, compiled by GopherJS, and
+// "-tags safe" is not added to the go build command line.  The "disableunsafe"
+// tag is deprecated and thus should not be used.
+// Go versions prior to 1.4 are disabled because they use a different layout
+// for interfaces which make the implementation of unsafeReflectValue more complex.
+// +build !js,!appengine,!safe,!disableunsafe,go1.4
+
+package spew
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+const (
+	// UnsafeDisabled is a build-time constant which specifies whether or
+	// not access to the unsafe package is available.
+	UnsafeDisabled = false
+
+	// ptrSize is the size of a pointer on the current arch.
+	ptrSize = unsafe.Sizeof((*byte)(nil))
+)
+
+type flag uintptr
+
+var (
+	// flagRO indicates whether the value field of a reflect.Value
+	// is read-only.
+	flagRO flag
+
+	// flagAddr indicates whether the address of the reflect.Value's
+	// value may be taken.
+	flagAddr flag
+)
+
+// flagKindMask holds the bits that make up the kind
+// part of the flags field. In all the supported versions,
+// it is in the lower 5 bits.
+const flagKindMask = flag(0x1f)
+
+// Different versions of Go have used different
+// bit layouts for the flags type. This table
+// records the known combinations.
+var okFlags = []struct {
+	ro, addr flag
+}{{
+	// From Go 1.4 to 1.5
+	ro:   1 << 5,
+	addr: 1 << 7,
+}, {
+	// Up to Go tip.
+	ro:   1<<5 | 1<<6,
+	addr: 1 << 8,
+}}
+
+var flagValOffset = func() uintptr {
+	field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+	if !ok {
+		panic("reflect.Value has no flag field")
+	}
+	return field.Offset
+}()
+
+// flagField returns a pointer to the flag field of a reflect.Value.
+func flagField(v *reflect.Value) *flag {
+	return (*flag)(unsafe.Pointer(uintptr(unsafe.Pointer(v)) + flagValOffset))
+}
+
+// unsafeReflectValue converts the passed reflect.Value into a one that bypasses
+// the typical safety restrictions preventing access to unaddressable and
+// unexported data.  It works by digging the raw pointer to the underlying
+// value out of the protected value and generating a new unprotected (unsafe)
+// reflect.Value to it.
+//
+// This allows us to check for implementations of the Stringer and error
+// interfaces to be used for pretty printing ordinarily unaddressable and
+// inaccessible values such as unexported struct fields.
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+	if !v.IsValid() || (v.CanInterface() && v.CanAddr()) {
+		return v
+	}
+	flagFieldPtr := flagField(&v)
+	*flagFieldPtr &^= flagRO
+	*flagFieldPtr |= flagAddr
+	return v
+}
+
+// Sanity checks against future reflect package changes
+// to the type or semantics of the Value.flag field.
+func init() {
+	field, ok := reflect.TypeOf(reflect.Value{}).FieldByName("flag")
+	if !ok {
+		panic("reflect.Value has no flag field")
+	}
+	if field.Type.Kind() != reflect.TypeOf(flag(0)).Kind() {
+		panic("reflect.Value flag field has changed kind")
+	}
+	type t0 int
+	var t struct {
+		A t0
+		// t0 will have flagEmbedRO set.
+		t0
+		// a will have flagStickyRO set
+		a t0
+	}
+	vA := reflect.ValueOf(t).FieldByName("A")
+	va := reflect.ValueOf(t).FieldByName("a")
+	vt0 := reflect.ValueOf(t).FieldByName("t0")
+
+	// Infer flagRO from the difference between the flags
+	// for the (otherwise identical) fields in t.
+	flagPublic := *flagField(&vA)
+	flagWithRO := *flagField(&va) | *flagField(&vt0)
+	flagRO = flagPublic ^ flagWithRO
+
+	// Infer flagAddr from the difference between a value
+	// taken from a pointer and not.
+	vPtrA := reflect.ValueOf(&t).Elem().FieldByName("A")
+	flagNoPtr := *flagField(&vA)
+	flagPtr := *flagField(&vPtrA)
+	flagAddr = flagNoPtr ^ flagPtr
+
+	// Check that the inferred flags tally with one of the known versions.
+	for _, f := range okFlags {
+		if flagRO == f.ro && flagAddr == f.addr {
+			return
+		}
+	}
+	panic("reflect.Value read-only flag has changed semantics")
+}
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go b/go/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go
new file mode 100644
index 0000000..205c28d
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go
@@ -0,0 +1,38 @@
+// Copyright (c) 2015-2016 Dave Collins <dave@davec.name>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// NOTE: Due to the following build constraints, this file will only be compiled
+// when the code is running on Google App Engine, compiled by GopherJS, or
+// "-tags safe" is added to the go build command line.  The "disableunsafe"
+// tag is deprecated and thus should not be used.
+// +build js appengine safe disableunsafe !go1.4
+
+package spew
+
+import "reflect"
+
+const (
+	// UnsafeDisabled is a build-time constant which specifies whether or
+	// not access to the unsafe package is available.
+	UnsafeDisabled = true
+)
+
+// unsafeReflectValue typically converts the passed reflect.Value into a one
+// that bypasses the typical safety restrictions preventing access to
+// unaddressable and unexported data.  However, doing this relies on access to
+// the unsafe package.  This is a stub version which simply returns the passed
+// reflect.Value when the unsafe package is not available.
+func unsafeReflectValue(v reflect.Value) reflect.Value {
+	return v
+}
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/common.go b/go/vendor/github.com/davecgh/go-spew/spew/common.go
new file mode 100644
index 0000000..1be8ce9
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/common.go
@@ -0,0 +1,341 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"reflect"
+	"sort"
+	"strconv"
+)
+
+// Some constants in the form of bytes to avoid string overhead.  This mirrors
+// the technique used in the fmt package.
+var (
+	panicBytes            = []byte("(PANIC=")
+	plusBytes             = []byte("+")
+	iBytes                = []byte("i")
+	trueBytes             = []byte("true")
+	falseBytes            = []byte("false")
+	interfaceBytes        = []byte("(interface {})")
+	commaNewlineBytes     = []byte(",\n")
+	newlineBytes          = []byte("\n")
+	openBraceBytes        = []byte("{")
+	openBraceNewlineBytes = []byte("{\n")
+	closeBraceBytes       = []byte("}")
+	asteriskBytes         = []byte("*")
+	colonBytes            = []byte(":")
+	colonSpaceBytes       = []byte(": ")
+	openParenBytes        = []byte("(")
+	closeParenBytes       = []byte(")")
+	spaceBytes            = []byte(" ")
+	pointerChainBytes     = []byte("->")
+	nilAngleBytes         = []byte("<nil>")
+	maxNewlineBytes       = []byte("<max depth reached>\n")
+	maxShortBytes         = []byte("<max>")
+	circularBytes         = []byte("<already shown>")
+	circularShortBytes    = []byte("<shown>")
+	invalidAngleBytes     = []byte("<invalid>")
+	openBracketBytes      = []byte("[")
+	closeBracketBytes     = []byte("]")
+	percentBytes          = []byte("%")
+	precisionBytes        = []byte(".")
+	openAngleBytes        = []byte("<")
+	closeAngleBytes       = []byte(">")
+	openMapBytes          = []byte("map[")
+	closeMapBytes         = []byte("]")
+	lenEqualsBytes        = []byte("len=")
+	capEqualsBytes        = []byte("cap=")
+)
+
+// hexDigits is used to map a decimal value to a hex digit.
+var hexDigits = "0123456789abcdef"
+
+// catchPanic handles any panics that might occur during the handleMethods
+// calls.
+func catchPanic(w io.Writer, v reflect.Value) {
+	if err := recover(); err != nil {
+		w.Write(panicBytes)
+		fmt.Fprintf(w, "%v", err)
+		w.Write(closeParenBytes)
+	}
+}
+
+// handleMethods attempts to call the Error and String methods on the underlying
+// type the passed reflect.Value represents and outputes the result to Writer w.
+//
+// It handles panics in any called methods by catching and displaying the error
+// as the formatted value.
+func handleMethods(cs *ConfigState, w io.Writer, v reflect.Value) (handled bool) {
+	// We need an interface to check if the type implements the error or
+	// Stringer interface.  However, the reflect package won't give us an
+	// interface on certain things like unexported struct fields in order
+	// to enforce visibility rules.  We use unsafe, when it's available,
+	// to bypass these restrictions since this package does not mutate the
+	// values.
+	if !v.CanInterface() {
+		if UnsafeDisabled {
+			return false
+		}
+
+		v = unsafeReflectValue(v)
+	}
+
+	// Choose whether or not to do error and Stringer interface lookups against
+	// the base type or a pointer to the base type depending on settings.
+	// Technically calling one of these methods with a pointer receiver can
+	// mutate the value, however, types which choose to satisify an error or
+	// Stringer interface with a pointer receiver should not be mutating their
+	// state inside these interface methods.
+	if !cs.DisablePointerMethods && !UnsafeDisabled && !v.CanAddr() {
+		v = unsafeReflectValue(v)
+	}
+	if v.CanAddr() {
+		v = v.Addr()
+	}
+
+	// Is it an error or Stringer?
+	switch iface := v.Interface().(type) {
+	case error:
+		defer catchPanic(w, v)
+		if cs.ContinueOnMethod {
+			w.Write(openParenBytes)
+			w.Write([]byte(iface.Error()))
+			w.Write(closeParenBytes)
+			w.Write(spaceBytes)
+			return false
+		}
+
+		w.Write([]byte(iface.Error()))
+		return true
+
+	case fmt.Stringer:
+		defer catchPanic(w, v)
+		if cs.ContinueOnMethod {
+			w.Write(openParenBytes)
+			w.Write([]byte(iface.String()))
+			w.Write(closeParenBytes)
+			w.Write(spaceBytes)
+			return false
+		}
+		w.Write([]byte(iface.String()))
+		return true
+	}
+	return false
+}
+
+// printBool outputs a boolean value as true or false to Writer w.
+func printBool(w io.Writer, val bool) {
+	if val {
+		w.Write(trueBytes)
+	} else {
+		w.Write(falseBytes)
+	}
+}
+
+// printInt outputs a signed integer value to Writer w.
+func printInt(w io.Writer, val int64, base int) {
+	w.Write([]byte(strconv.FormatInt(val, base)))
+}
+
+// printUint outputs an unsigned integer value to Writer w.
+func printUint(w io.Writer, val uint64, base int) {
+	w.Write([]byte(strconv.FormatUint(val, base)))
+}
+
+// printFloat outputs a floating point value using the specified precision,
+// which is expected to be 32 or 64bit, to Writer w.
+func printFloat(w io.Writer, val float64, precision int) {
+	w.Write([]byte(strconv.FormatFloat(val, 'g', -1, precision)))
+}
+
+// printComplex outputs a complex value using the specified float precision
+// for the real and imaginary parts to Writer w.
+func printComplex(w io.Writer, c complex128, floatPrecision int) {
+	r := real(c)
+	w.Write(openParenBytes)
+	w.Write([]byte(strconv.FormatFloat(r, 'g', -1, floatPrecision)))
+	i := imag(c)
+	if i >= 0 {
+		w.Write(plusBytes)
+	}
+	w.Write([]byte(strconv.FormatFloat(i, 'g', -1, floatPrecision)))
+	w.Write(iBytes)
+	w.Write(closeParenBytes)
+}
+
+// printHexPtr outputs a uintptr formatted as hexadecimal with a leading '0x'
+// prefix to Writer w.
+func printHexPtr(w io.Writer, p uintptr) {
+	// Null pointer.
+	num := uint64(p)
+	if num == 0 {
+		w.Write(nilAngleBytes)
+		return
+	}
+
+	// Max uint64 is 16 bytes in hex + 2 bytes for '0x' prefix
+	buf := make([]byte, 18)
+
+	// It's simpler to construct the hex string right to left.
+	base := uint64(16)
+	i := len(buf) - 1
+	for num >= base {
+		buf[i] = hexDigits[num%base]
+		num /= base
+		i--
+	}
+	buf[i] = hexDigits[num]
+
+	// Add '0x' prefix.
+	i--
+	buf[i] = 'x'
+	i--
+	buf[i] = '0'
+
+	// Strip unused leading bytes.
+	buf = buf[i:]
+	w.Write(buf)
+}
+
+// valuesSorter implements sort.Interface to allow a slice of reflect.Value
+// elements to be sorted.
+type valuesSorter struct {
+	values  []reflect.Value
+	strings []string // either nil or same len and values
+	cs      *ConfigState
+}
+
+// newValuesSorter initializes a valuesSorter instance, which holds a set of
+// surrogate keys on which the data should be sorted.  It uses flags in
+// ConfigState to decide if and how to populate those surrogate keys.
+func newValuesSorter(values []reflect.Value, cs *ConfigState) sort.Interface {
+	vs := &valuesSorter{values: values, cs: cs}
+	if canSortSimply(vs.values[0].Kind()) {
+		return vs
+	}
+	if !cs.DisableMethods {
+		vs.strings = make([]string, len(values))
+		for i := range vs.values {
+			b := bytes.Buffer{}
+			if !handleMethods(cs, &b, vs.values[i]) {
+				vs.strings = nil
+				break
+			}
+			vs.strings[i] = b.String()
+		}
+	}
+	if vs.strings == nil && cs.SpewKeys {
+		vs.strings = make([]string, len(values))
+		for i := range vs.values {
+			vs.strings[i] = Sprintf("%#v", vs.values[i].Interface())
+		}
+	}
+	return vs
+}
+
+// canSortSimply tests whether a reflect.Kind is a primitive that can be sorted
+// directly, or whether it should be considered for sorting by surrogate keys
+// (if the ConfigState allows it).
+func canSortSimply(kind reflect.Kind) bool {
+	// This switch parallels valueSortLess, except for the default case.
+	switch kind {
+	case reflect.Bool:
+		return true
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		return true
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		return true
+	case reflect.Float32, reflect.Float64:
+		return true
+	case reflect.String:
+		return true
+	case reflect.Uintptr:
+		return true
+	case reflect.Array:
+		return true
+	}
+	return false
+}
+
+// Len returns the number of values in the slice.  It is part of the
+// sort.Interface implementation.
+func (s *valuesSorter) Len() int {
+	return len(s.values)
+}
+
+// Swap swaps the values at the passed indices.  It is part of the
+// sort.Interface implementation.
+func (s *valuesSorter) Swap(i, j int) {
+	s.values[i], s.values[j] = s.values[j], s.values[i]
+	if s.strings != nil {
+		s.strings[i], s.strings[j] = s.strings[j], s.strings[i]
+	}
+}
+
+// valueSortLess returns whether the first value should sort before the second
+// value.  It is used by valueSorter.Less as part of the sort.Interface
+// implementation.
+func valueSortLess(a, b reflect.Value) bool {
+	switch a.Kind() {
+	case reflect.Bool:
+		return !a.Bool() && b.Bool()
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		return a.Int() < b.Int()
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		return a.Uint() < b.Uint()
+	case reflect.Float32, reflect.Float64:
+		return a.Float() < b.Float()
+	case reflect.String:
+		return a.String() < b.String()
+	case reflect.Uintptr:
+		return a.Uint() < b.Uint()
+	case reflect.Array:
+		// Compare the contents of both arrays.
+		l := a.Len()
+		for i := 0; i < l; i++ {
+			av := a.Index(i)
+			bv := b.Index(i)
+			if av.Interface() == bv.Interface() {
+				continue
+			}
+			return valueSortLess(av, bv)
+		}
+	}
+	return a.String() < b.String()
+}
+
+// Less returns whether the value at index i should sort before the
+// value at index j.  It is part of the sort.Interface implementation.
+func (s *valuesSorter) Less(i, j int) bool {
+	if s.strings == nil {
+		return valueSortLess(s.values[i], s.values[j])
+	}
+	return s.strings[i] < s.strings[j]
+}
+
+// sortValues is a sort function that handles both native types and any type that
+// can be converted to error or Stringer.  Other inputs are sorted according to
+// their Value.String() value to ensure display stability.
+func sortValues(values []reflect.Value, cs *ConfigState) {
+	if len(values) == 0 {
+		return
+	}
+	sort.Sort(newValuesSorter(values, cs))
+}
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/config.go b/go/vendor/github.com/davecgh/go-spew/spew/config.go
new file mode 100644
index 0000000..2e3d22f
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/config.go
@@ -0,0 +1,306 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+)
+
+// ConfigState houses the configuration options used by spew to format and
+// display values.  There is a global instance, Config, that is used to control
+// all top-level Formatter and Dump functionality.  Each ConfigState instance
+// provides methods equivalent to the top-level functions.
+//
+// The zero value for ConfigState provides no indentation.  You would typically
+// want to set it to a space or a tab.
+//
+// Alternatively, you can use NewDefaultConfig to get a ConfigState instance
+// with default settings.  See the documentation of NewDefaultConfig for default
+// values.
+type ConfigState struct {
+	// Indent specifies the string to use for each indentation level.  The
+	// global config instance that all top-level functions use set this to a
+	// single space by default.  If you would like more indentation, you might
+	// set this to a tab with "\t" or perhaps two spaces with "  ".
+	Indent string
+
+	// MaxDepth controls the maximum number of levels to descend into nested
+	// data structures.  The default, 0, means there is no limit.
+	//
+	// NOTE: Circular data structures are properly detected, so it is not
+	// necessary to set this value unless you specifically want to limit deeply
+	// nested data structures.
+	MaxDepth int
+
+	// DisableMethods specifies whether or not error and Stringer interfaces are
+	// invoked for types that implement them.
+	DisableMethods bool
+
+	// DisablePointerMethods specifies whether or not to check for and invoke
+	// error and Stringer interfaces on types which only accept a pointer
+	// receiver when the current type is not a pointer.
+	//
+	// NOTE: This might be an unsafe action since calling one of these methods
+	// with a pointer receiver could technically mutate the value, however,
+	// in practice, types which choose to satisify an error or Stringer
+	// interface with a pointer receiver should not be mutating their state
+	// inside these interface methods.  As a result, this option relies on
+	// access to the unsafe package, so it will not have any effect when
+	// running in environments without access to the unsafe package such as
+	// Google App Engine or with the "safe" build tag specified.
+	DisablePointerMethods bool
+
+	// DisablePointerAddresses specifies whether to disable the printing of
+	// pointer addresses. This is useful when diffing data structures in tests.
+	DisablePointerAddresses bool
+
+	// DisableCapacities specifies whether to disable the printing of capacities
+	// for arrays, slices, maps and channels. This is useful when diffing
+	// data structures in tests.
+	DisableCapacities bool
+
+	// ContinueOnMethod specifies whether or not recursion should continue once
+	// a custom error or Stringer interface is invoked.  The default, false,
+	// means it will print the results of invoking the custom error or Stringer
+	// interface and return immediately instead of continuing to recurse into
+	// the internals of the data type.
+	//
+	// NOTE: This flag does not have any effect if method invocation is disabled
+	// via the DisableMethods or DisablePointerMethods options.
+	ContinueOnMethod bool
+
+	// SortKeys specifies map keys should be sorted before being printed. Use
+	// this to have a more deterministic, diffable output.  Note that only
+	// native types (bool, int, uint, floats, uintptr and string) and types
+	// that support the error or Stringer interfaces (if methods are
+	// enabled) are supported, with other types sorted according to the
+	// reflect.Value.String() output which guarantees display stability.
+	SortKeys bool
+
+	// SpewKeys specifies that, as a last resort attempt, map keys should
+	// be spewed to strings and sorted by those strings.  This is only
+	// considered if SortKeys is true.
+	SpewKeys bool
+}
+
+// Config is the active configuration of the top-level functions.
+// The configuration can be changed by modifying the contents of spew.Config.
+var Config = ConfigState{Indent: " "}
+
+// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the formatted string as a value that satisfies error.  See NewFormatter
+// for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Errorf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Errorf(format string, a ...interface{}) (err error) {
+	return fmt.Errorf(format, c.convertArgs(a)...)
+}
+
+// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprint(w, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprint(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprint(w, c.convertArgs(a)...)
+}
+
+// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintf(w, format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(w, format, c.convertArgs(a)...)
+}
+
+// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
+// passed with a Formatter interface returned by c.NewFormatter.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintln(w, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(w, c.convertArgs(a)...)
+}
+
+// Print is a wrapper for fmt.Print that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Print(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Print(a ...interface{}) (n int, err error) {
+	return fmt.Print(c.convertArgs(a)...)
+}
+
+// Printf is a wrapper for fmt.Printf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Printf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Printf(format, c.convertArgs(a)...)
+}
+
+// Println is a wrapper for fmt.Println that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Println(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Println(a ...interface{}) (n int, err error) {
+	return fmt.Println(c.convertArgs(a)...)
+}
+
+// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprint(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprint(a ...interface{}) string {
+	return fmt.Sprint(c.convertArgs(a)...)
+}
+
+// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
+// passed with a Formatter interface returned by c.NewFormatter.  It returns
+// the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintf(format, c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprintf(format string, a ...interface{}) string {
+	return fmt.Sprintf(format, c.convertArgs(a)...)
+}
+
+// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
+// were passed with a Formatter interface returned by c.NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintln(c.NewFormatter(a), c.NewFormatter(b))
+func (c *ConfigState) Sprintln(a ...interface{}) string {
+	return fmt.Sprintln(c.convertArgs(a)...)
+}
+
+/*
+NewFormatter returns a custom formatter that satisfies the fmt.Formatter
+interface.  As a result, it integrates cleanly with standard fmt package
+printing functions.  The formatter is useful for inline printing of smaller data
+types similar to the standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), and %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Typically this function shouldn't be called directly.  It is much easier to make
+use of the custom formatter by calling one of the convenience functions such as
+c.Printf, c.Println, or c.Printf.
+*/
+func (c *ConfigState) NewFormatter(v interface{}) fmt.Formatter {
+	return newFormatter(c, v)
+}
+
+// Fdump formats and displays the passed arguments to io.Writer w.  It formats
+// exactly the same as Dump.
+func (c *ConfigState) Fdump(w io.Writer, a ...interface{}) {
+	fdump(c, w, a...)
+}
+
+/*
+Dump displays the passed parameters to standard out with newlines, customizable
+indentation, and additional debug information such as complete types and all
+pointer addresses used to indirect to the final value.  It provides the
+following features over the built-in printing facilities provided by the fmt
+package:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output
+
+The configuration options are controlled by modifying the public members
+of c.  See ConfigState for options documentation.
+
+See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
+get the formatted result as a string.
+*/
+func (c *ConfigState) Dump(a ...interface{}) {
+	fdump(c, os.Stdout, a...)
+}
+
+// Sdump returns a string with the passed arguments formatted exactly the same
+// as Dump.
+func (c *ConfigState) Sdump(a ...interface{}) string {
+	var buf bytes.Buffer
+	fdump(c, &buf, a...)
+	return buf.String()
+}
+
+// convertArgs accepts a slice of arguments and returns a slice of the same
+// length with each argument converted to a spew Formatter interface using
+// the ConfigState associated with s.
+func (c *ConfigState) convertArgs(args []interface{}) (formatters []interface{}) {
+	formatters = make([]interface{}, len(args))
+	for index, arg := range args {
+		formatters[index] = newFormatter(c, arg)
+	}
+	return formatters
+}
+
+// NewDefaultConfig returns a ConfigState with the following default settings.
+//
+// 	Indent: " "
+// 	MaxDepth: 0
+// 	DisableMethods: false
+// 	DisablePointerMethods: false
+// 	ContinueOnMethod: false
+// 	SortKeys: false
+func NewDefaultConfig() *ConfigState {
+	return &ConfigState{Indent: " "}
+}
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/doc.go b/go/vendor/github.com/davecgh/go-spew/spew/doc.go
new file mode 100644
index 0000000..aacaac6
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/doc.go
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+Package spew implements a deep pretty printer for Go data structures to aid in
+debugging.
+
+A quick overview of the additional features spew provides over the built-in
+printing facilities for Go data types are as follows:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output (only when using
+	  Dump style)
+
+There are two different approaches spew allows for dumping Go data structures:
+
+	* Dump style which prints with newlines, customizable indentation,
+	  and additional debug information such as types and all pointer addresses
+	  used to indirect to the final value
+	* A custom Formatter interface that integrates cleanly with the standard fmt
+	  package and replaces %v, %+v, %#v, and %#+v to provide inline printing
+	  similar to the default %v while providing the additional functionality
+	  outlined above and passing unsupported format verbs such as %x and %q
+	  along to fmt
+
+Quick Start
+
+This section demonstrates how to quickly get started with spew.  See the
+sections below for further details on formatting and configuration options.
+
+To dump a variable with full newlines, indentation, type, and pointer
+information use Dump, Fdump, or Sdump:
+	spew.Dump(myVar1, myVar2, ...)
+	spew.Fdump(someWriter, myVar1, myVar2, ...)
+	str := spew.Sdump(myVar1, myVar2, ...)
+
+Alternatively, if you would prefer to use format strings with a compacted inline
+printing style, use the convenience wrappers Printf, Fprintf, etc with
+%v (most compact), %+v (adds pointer addresses), %#v (adds types), or
+%#+v (adds types and pointer addresses):
+	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+	spew.Fprintf(someWriter, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Fprintf(someWriter, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+
+Configuration Options
+
+Configuration of spew is handled by fields in the ConfigState type.  For
+convenience, all of the top-level functions use a global state available
+via the spew.Config global.
+
+It is also possible to create a ConfigState instance that provides methods
+equivalent to the top-level functions.  This allows concurrent configuration
+options.  See the ConfigState documentation for more details.
+
+The following configuration options are available:
+	* Indent
+		String to use for each indentation level for Dump functions.
+		It is a single space by default.  A popular alternative is "\t".
+
+	* MaxDepth
+		Maximum number of levels to descend into nested data structures.
+		There is no limit by default.
+
+	* DisableMethods
+		Disables invocation of error and Stringer interface methods.
+		Method invocation is enabled by default.
+
+	* DisablePointerMethods
+		Disables invocation of error and Stringer interface methods on types
+		which only accept pointer receivers from non-pointer variables.
+		Pointer method invocation is enabled by default.
+
+	* DisablePointerAddresses
+		DisablePointerAddresses specifies whether to disable the printing of
+		pointer addresses. This is useful when diffing data structures in tests.
+
+	* DisableCapacities
+		DisableCapacities specifies whether to disable the printing of
+		capacities for arrays, slices, maps and channels. This is useful when
+		diffing data structures in tests.
+
+	* ContinueOnMethod
+		Enables recursion into types after invoking error and Stringer interface
+		methods. Recursion after method invocation is disabled by default.
+
+	* SortKeys
+		Specifies map keys should be sorted before being printed. Use
+		this to have a more deterministic, diffable output.  Note that
+		only native types (bool, int, uint, floats, uintptr and string)
+		and types which implement error or Stringer interfaces are
+		supported with other types sorted according to the
+		reflect.Value.String() output which guarantees display
+		stability.  Natural map order is used by default.
+
+	* SpewKeys
+		Specifies that, as a last resort attempt, map keys should be
+		spewed to strings and sorted by those strings.  This is only
+		considered if SortKeys is true.
+
+Dump Usage
+
+Simply call spew.Dump with a list of variables you want to dump:
+
+	spew.Dump(myVar1, myVar2, ...)
+
+You may also call spew.Fdump if you would prefer to output to an arbitrary
+io.Writer.  For example, to dump to standard error:
+
+	spew.Fdump(os.Stderr, myVar1, myVar2, ...)
+
+A third option is to call spew.Sdump to get the formatted output as a string:
+
+	str := spew.Sdump(myVar1, myVar2, ...)
+
+Sample Dump Output
+
+See the Dump example for details on the setup of the types and variables being
+shown here.
+
+	(main.Foo) {
+	 unexportedField: (*main.Bar)(0xf84002e210)({
+	  flag: (main.Flag) flagTwo,
+	  data: (uintptr) <nil>
+	 }),
+	 ExportedField: (map[interface {}]interface {}) (len=1) {
+	  (string) (len=3) "one": (bool) true
+	 }
+	}
+
+Byte (and uint8) arrays and slices are displayed uniquely like the hexdump -C
+command as shown.
+	([]uint8) (len=32 cap=32) {
+	 00000000  11 12 13 14 15 16 17 18  19 1a 1b 1c 1d 1e 1f 20  |............... |
+	 00000010  21 22 23 24 25 26 27 28  29 2a 2b 2c 2d 2e 2f 30  |!"#$%&'()*+,-./0|
+	 00000020  31 32                                             |12|
+	}
+
+Custom Formatter
+
+Spew provides a custom formatter that implements the fmt.Formatter interface
+so that it integrates cleanly with standard fmt package printing functions. The
+formatter is useful for inline printing of smaller data types similar to the
+standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Custom Formatter Usage
+
+The simplest way to make use of the spew custom formatter is to call one of the
+convenience functions such as spew.Printf, spew.Println, or spew.Printf.  The
+functions have syntax you are most likely already familiar with:
+
+	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+	spew.Println(myVar, myVar2)
+	spew.Fprintf(os.Stderr, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
+	spew.Fprintf(os.Stderr, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
+
+See the Index for the full list convenience functions.
+
+Sample Formatter Output
+
+Double pointer to a uint8:
+	  %v: <**>5
+	 %+v: <**>(0xf8400420d0->0xf8400420c8)5
+	 %#v: (**uint8)5
+	%#+v: (**uint8)(0xf8400420d0->0xf8400420c8)5
+
+Pointer to circular struct with a uint8 field and a pointer to itself:
+	  %v: <*>{1 <*><shown>}
+	 %+v: <*>(0xf84003e260){ui8:1 c:<*>(0xf84003e260)<shown>}
+	 %#v: (*main.circular){ui8:(uint8)1 c:(*main.circular)<shown>}
+	%#+v: (*main.circular)(0xf84003e260){ui8:(uint8)1 c:(*main.circular)(0xf84003e260)<shown>}
+
+See the Printf example for details on the setup of variables being shown
+here.
+
+Errors
+
+Since it is possible for custom Stringer/error interfaces to panic, spew
+detects them and handles them internally by printing the panic information
+inline with the output.  Since spew is intended to provide deep pretty printing
+capabilities on structures, it intentionally does not return any errors.
+*/
+package spew
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/dump.go b/go/vendor/github.com/davecgh/go-spew/spew/dump.go
new file mode 100644
index 0000000..f78d89f
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/dump.go
@@ -0,0 +1,509 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+var (
+	// uint8Type is a reflect.Type representing a uint8.  It is used to
+	// convert cgo types to uint8 slices for hexdumping.
+	uint8Type = reflect.TypeOf(uint8(0))
+
+	// cCharRE is a regular expression that matches a cgo char.
+	// It is used to detect character arrays to hexdump them.
+	cCharRE = regexp.MustCompile(`^.*\._Ctype_char$`)
+
+	// cUnsignedCharRE is a regular expression that matches a cgo unsigned
+	// char.  It is used to detect unsigned character arrays to hexdump
+	// them.
+	cUnsignedCharRE = regexp.MustCompile(`^.*\._Ctype_unsignedchar$`)
+
+	// cUint8tCharRE is a regular expression that matches a cgo uint8_t.
+	// It is used to detect uint8_t arrays to hexdump them.
+	cUint8tCharRE = regexp.MustCompile(`^.*\._Ctype_uint8_t$`)
+)
+
+// dumpState contains information about the state of a dump operation.
+type dumpState struct {
+	w                io.Writer
+	depth            int
+	pointers         map[uintptr]int
+	ignoreNextType   bool
+	ignoreNextIndent bool
+	cs               *ConfigState
+}
+
+// indent performs indentation according to the depth level and cs.Indent
+// option.
+func (d *dumpState) indent() {
+	if d.ignoreNextIndent {
+		d.ignoreNextIndent = false
+		return
+	}
+	d.w.Write(bytes.Repeat([]byte(d.cs.Indent), d.depth))
+}
+
+// unpackValue returns values inside of non-nil interfaces when possible.
+// This is useful for data types like structs, arrays, slices, and maps which
+// can contain varying types packed inside an interface.
+func (d *dumpState) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface && !v.IsNil() {
+		v = v.Elem()
+	}
+	return v
+}
+
+// dumpPtr handles formatting of pointers by indirecting them as necessary.
+func (d *dumpState) dumpPtr(v reflect.Value) {
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range d.pointers {
+		if depth >= d.depth {
+			delete(d.pointers, k)
+		}
+	}
+
+	// Keep list of all dereferenced pointers to show later.
+	pointerChain := make([]uintptr, 0)
+
+	// Figure out how many levels of indirection there are by dereferencing
+	// pointers and unpacking interfaces down the chain while detecting circular
+	// references.
+	nilFound := false
+	cycleFound := false
+	indirects := 0
+	ve := v
+	for ve.Kind() == reflect.Ptr {
+		if ve.IsNil() {
+			nilFound = true
+			break
+		}
+		indirects++
+		addr := ve.Pointer()
+		pointerChain = append(pointerChain, addr)
+		if pd, ok := d.pointers[addr]; ok && pd < d.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		d.pointers[addr] = d.depth
+
+		ve = ve.Elem()
+		if ve.Kind() == reflect.Interface {
+			if ve.IsNil() {
+				nilFound = true
+				break
+			}
+			ve = ve.Elem()
+		}
+	}
+
+	// Display type information.
+	d.w.Write(openParenBytes)
+	d.w.Write(bytes.Repeat(asteriskBytes, indirects))
+	d.w.Write([]byte(ve.Type().String()))
+	d.w.Write(closeParenBytes)
+
+	// Display pointer information.
+	if !d.cs.DisablePointerAddresses && len(pointerChain) > 0 {
+		d.w.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				d.w.Write(pointerChainBytes)
+			}
+			printHexPtr(d.w, addr)
+		}
+		d.w.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	d.w.Write(openParenBytes)
+	switch {
+	case nilFound:
+		d.w.Write(nilAngleBytes)
+
+	case cycleFound:
+		d.w.Write(circularBytes)
+
+	default:
+		d.ignoreNextType = true
+		d.dump(ve)
+	}
+	d.w.Write(closeParenBytes)
+}
+
+// dumpSlice handles formatting of arrays and slices.  Byte (uint8 under
+// reflection) arrays and slices are dumped in hexdump -C fashion.
+func (d *dumpState) dumpSlice(v reflect.Value) {
+	// Determine whether this type should be hex dumped or not.  Also,
+	// for types which should be hexdumped, try to use the underlying data
+	// first, then fall back to trying to convert them to a uint8 slice.
+	var buf []uint8
+	doConvert := false
+	doHexDump := false
+	numEntries := v.Len()
+	if numEntries > 0 {
+		vt := v.Index(0).Type()
+		vts := vt.String()
+		switch {
+		// C types that need to be converted.
+		case cCharRE.MatchString(vts):
+			fallthrough
+		case cUnsignedCharRE.MatchString(vts):
+			fallthrough
+		case cUint8tCharRE.MatchString(vts):
+			doConvert = true
+
+		// Try to use existing uint8 slices and fall back to converting
+		// and copying if that fails.
+		case vt.Kind() == reflect.Uint8:
+			// We need an addressable interface to convert the type
+			// to a byte slice.  However, the reflect package won't
+			// give us an interface on certain things like
+			// unexported struct fields in order to enforce
+			// visibility rules.  We use unsafe, when available, to
+			// bypass these restrictions since this package does not
+			// mutate the values.
+			vs := v
+			if !vs.CanInterface() || !vs.CanAddr() {
+				vs = unsafeReflectValue(vs)
+			}
+			if !UnsafeDisabled {
+				vs = vs.Slice(0, numEntries)
+
+				// Use the existing uint8 slice if it can be
+				// type asserted.
+				iface := vs.Interface()
+				if slice, ok := iface.([]uint8); ok {
+					buf = slice
+					doHexDump = true
+					break
+				}
+			}
+
+			// The underlying data needs to be converted if it can't
+			// be type asserted to a uint8 slice.
+			doConvert = true
+		}
+
+		// Copy and convert the underlying type if needed.
+		if doConvert && vt.ConvertibleTo(uint8Type) {
+			// Convert and copy each element into a uint8 byte
+			// slice.
+			buf = make([]uint8, numEntries)
+			for i := 0; i < numEntries; i++ {
+				vv := v.Index(i)
+				buf[i] = uint8(vv.Convert(uint8Type).Uint())
+			}
+			doHexDump = true
+		}
+	}
+
+	// Hexdump the entire slice as needed.
+	if doHexDump {
+		indent := strings.Repeat(d.cs.Indent, d.depth)
+		str := indent + hex.Dump(buf)
+		str = strings.Replace(str, "\n", "\n"+indent, -1)
+		str = strings.TrimRight(str, d.cs.Indent)
+		d.w.Write([]byte(str))
+		return
+	}
+
+	// Recursively call dump for each item.
+	for i := 0; i < numEntries; i++ {
+		d.dump(d.unpackValue(v.Index(i)))
+		if i < (numEntries - 1) {
+			d.w.Write(commaNewlineBytes)
+		} else {
+			d.w.Write(newlineBytes)
+		}
+	}
+}
+
+// dump is the main workhorse for dumping a value.  It uses the passed reflect
+// value to figure out what kind of object we are dealing with and formats it
+// appropriately.  It is a recursive function, however circular data structures
+// are detected and handled properly.
+func (d *dumpState) dump(v reflect.Value) {
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		d.w.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		d.indent()
+		d.dumpPtr(v)
+		return
+	}
+
+	// Print type information unless already handled elsewhere.
+	if !d.ignoreNextType {
+		d.indent()
+		d.w.Write(openParenBytes)
+		d.w.Write([]byte(v.Type().String()))
+		d.w.Write(closeParenBytes)
+		d.w.Write(spaceBytes)
+	}
+	d.ignoreNextType = false
+
+	// Display length and capacity if the built-in len and cap functions
+	// work with the value's kind and the len/cap itself is non-zero.
+	valueLen, valueCap := 0, 0
+	switch v.Kind() {
+	case reflect.Array, reflect.Slice, reflect.Chan:
+		valueLen, valueCap = v.Len(), v.Cap()
+	case reflect.Map, reflect.String:
+		valueLen = v.Len()
+	}
+	if valueLen != 0 || !d.cs.DisableCapacities && valueCap != 0 {
+		d.w.Write(openParenBytes)
+		if valueLen != 0 {
+			d.w.Write(lenEqualsBytes)
+			printInt(d.w, int64(valueLen), 10)
+		}
+		if !d.cs.DisableCapacities && valueCap != 0 {
+			if valueLen != 0 {
+				d.w.Write(spaceBytes)
+			}
+			d.w.Write(capEqualsBytes)
+			printInt(d.w, int64(valueCap), 10)
+		}
+		d.w.Write(closeParenBytes)
+		d.w.Write(spaceBytes)
+	}
+
+	// Call Stringer/error interfaces if they exist and the handle methods flag
+	// is enabled
+	if !d.cs.DisableMethods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(d.cs, d.w, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		// Do nothing.  We should never get here since invalid has already
+		// been handled above.
+
+	case reflect.Bool:
+		printBool(d.w, v.Bool())
+
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		printInt(d.w, v.Int(), 10)
+
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		printUint(d.w, v.Uint(), 10)
+
+	case reflect.Float32:
+		printFloat(d.w, v.Float(), 32)
+
+	case reflect.Float64:
+		printFloat(d.w, v.Float(), 64)
+
+	case reflect.Complex64:
+		printComplex(d.w, v.Complex(), 32)
+
+	case reflect.Complex128:
+		printComplex(d.w, v.Complex(), 64)
+
+	case reflect.Slice:
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+
+	case reflect.Array:
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			d.dumpSlice(v)
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.String:
+		d.w.Write([]byte(strconv.Quote(v.String())))
+
+	case reflect.Interface:
+		// The only time we should get here is for nil interfaces due to
+		// unpackValue calls.
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+		}
+
+	case reflect.Ptr:
+		// Do nothing.  We should never get here since pointers have already
+		// been handled above.
+
+	case reflect.Map:
+		// nil maps should be indicated as different than empty maps
+		if v.IsNil() {
+			d.w.Write(nilAngleBytes)
+			break
+		}
+
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			numEntries := v.Len()
+			keys := v.MapKeys()
+			if d.cs.SortKeys {
+				sortValues(keys, d.cs)
+			}
+			for i, key := range keys {
+				d.dump(d.unpackValue(key))
+				d.w.Write(colonSpaceBytes)
+				d.ignoreNextIndent = true
+				d.dump(d.unpackValue(v.MapIndex(key)))
+				if i < (numEntries - 1) {
+					d.w.Write(commaNewlineBytes)
+				} else {
+					d.w.Write(newlineBytes)
+				}
+			}
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.Struct:
+		d.w.Write(openBraceNewlineBytes)
+		d.depth++
+		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
+			d.indent()
+			d.w.Write(maxNewlineBytes)
+		} else {
+			vt := v.Type()
+			numFields := v.NumField()
+			for i := 0; i < numFields; i++ {
+				d.indent()
+				vtf := vt.Field(i)
+				d.w.Write([]byte(vtf.Name))
+				d.w.Write(colonSpaceBytes)
+				d.ignoreNextIndent = true
+				d.dump(d.unpackValue(v.Field(i)))
+				if i < (numFields - 1) {
+					d.w.Write(commaNewlineBytes)
+				} else {
+					d.w.Write(newlineBytes)
+				}
+			}
+		}
+		d.depth--
+		d.indent()
+		d.w.Write(closeBraceBytes)
+
+	case reflect.Uintptr:
+		printHexPtr(d.w, uintptr(v.Uint()))
+
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		printHexPtr(d.w, v.Pointer())
+
+	// There were not any other types at the time this code was written, but
+	// fall back to letting the default fmt package handle it in case any new
+	// types are added.
+	default:
+		if v.CanInterface() {
+			fmt.Fprintf(d.w, "%v", v.Interface())
+		} else {
+			fmt.Fprintf(d.w, "%v", v.String())
+		}
+	}
+}
+
+// fdump is a helper function to consolidate the logic from the various public
+// methods which take varying writers and config states.
+func fdump(cs *ConfigState, w io.Writer, a ...interface{}) {
+	for _, arg := range a {
+		if arg == nil {
+			w.Write(interfaceBytes)
+			w.Write(spaceBytes)
+			w.Write(nilAngleBytes)
+			w.Write(newlineBytes)
+			continue
+		}
+
+		d := dumpState{w: w, cs: cs}
+		d.pointers = make(map[uintptr]int)
+		d.dump(reflect.ValueOf(arg))
+		d.w.Write(newlineBytes)
+	}
+}
+
+// Fdump formats and displays the passed arguments to io.Writer w.  It formats
+// exactly the same as Dump.
+func Fdump(w io.Writer, a ...interface{}) {
+	fdump(&Config, w, a...)
+}
+
+// Sdump returns a string with the passed arguments formatted exactly the same
+// as Dump.
+func Sdump(a ...interface{}) string {
+	var buf bytes.Buffer
+	fdump(&Config, &buf, a...)
+	return buf.String()
+}
+
+/*
+Dump displays the passed parameters to standard out with newlines, customizable
+indentation, and additional debug information such as complete types and all
+pointer addresses used to indirect to the final value.  It provides the
+following features over the built-in printing facilities provided by the fmt
+package:
+
+	* Pointers are dereferenced and followed
+	* Circular data structures are detected and handled properly
+	* Custom Stringer/error interfaces are optionally invoked, including
+	  on unexported types
+	* Custom types which only implement the Stringer/error interfaces via
+	  a pointer receiver are optionally invoked when passing non-pointer
+	  variables
+	* Byte arrays and slices are dumped like the hexdump -C command which
+	  includes offsets, byte values in hex, and ASCII output
+
+The configuration options are controlled by an exported package global,
+spew.Config.  See ConfigState for options documentation.
+
+See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
+get the formatted result as a string.
+*/
+func Dump(a ...interface{}) {
+	fdump(&Config, os.Stdout, a...)
+}
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/format.go b/go/vendor/github.com/davecgh/go-spew/spew/format.go
new file mode 100644
index 0000000..b04edb7
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/format.go
@@ -0,0 +1,419 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// supportedFlags is a list of all the character flags supported by fmt package.
+const supportedFlags = "0-+# "
+
+// formatState implements the fmt.Formatter interface and contains information
+// about the state of a formatting operation.  The NewFormatter function can
+// be used to get a new Formatter which can be used directly as arguments
+// in standard fmt package printing calls.
+type formatState struct {
+	value          interface{}
+	fs             fmt.State
+	depth          int
+	pointers       map[uintptr]int
+	ignoreNextType bool
+	cs             *ConfigState
+}
+
+// buildDefaultFormat recreates the original format string without precision
+// and width information to pass in to fmt.Sprintf in the case of an
+// unrecognized type.  Unless new types are added to the language, this
+// function won't ever be called.
+func (f *formatState) buildDefaultFormat() (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range supportedFlags {
+		if f.fs.Flag(int(flag)) {
+			buf.WriteRune(flag)
+		}
+	}
+
+	buf.WriteRune('v')
+
+	format = buf.String()
+	return format
+}
+
+// constructOrigFormat recreates the original format string including precision
+// and width information to pass along to the standard fmt package.  This allows
+// automatic deferral of all format strings this package doesn't support.
+func (f *formatState) constructOrigFormat(verb rune) (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range supportedFlags {
+		if f.fs.Flag(int(flag)) {
+			buf.WriteRune(flag)
+		}
+	}
+
+	if width, ok := f.fs.Width(); ok {
+		buf.WriteString(strconv.Itoa(width))
+	}
+
+	if precision, ok := f.fs.Precision(); ok {
+		buf.Write(precisionBytes)
+		buf.WriteString(strconv.Itoa(precision))
+	}
+
+	buf.WriteRune(verb)
+
+	format = buf.String()
+	return format
+}
+
+// unpackValue returns values inside of non-nil interfaces when possible and
+// ensures that types for values which have been unpacked from an interface
+// are displayed when the show types flag is also set.
+// This is useful for data types like structs, arrays, slices, and maps which
+// can contain varying types packed inside an interface.
+func (f *formatState) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface {
+		f.ignoreNextType = false
+		if !v.IsNil() {
+			v = v.Elem()
+		}
+	}
+	return v
+}
+
+// formatPtr handles formatting of pointers by indirecting them as necessary.
+func (f *formatState) formatPtr(v reflect.Value) {
+	// Display nil if top level pointer is nil.
+	showTypes := f.fs.Flag('#')
+	if v.IsNil() && (!showTypes || f.ignoreNextType) {
+		f.fs.Write(nilAngleBytes)
+		return
+	}
+
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range f.pointers {
+		if depth >= f.depth {
+			delete(f.pointers, k)
+		}
+	}
+
+	// Keep list of all dereferenced pointers to possibly show later.
+	pointerChain := make([]uintptr, 0)
+
+	// Figure out how many levels of indirection there are by derferencing
+	// pointers and unpacking interfaces down the chain while detecting circular
+	// references.
+	nilFound := false
+	cycleFound := false
+	indirects := 0
+	ve := v
+	for ve.Kind() == reflect.Ptr {
+		if ve.IsNil() {
+			nilFound = true
+			break
+		}
+		indirects++
+		addr := ve.Pointer()
+		pointerChain = append(pointerChain, addr)
+		if pd, ok := f.pointers[addr]; ok && pd < f.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		f.pointers[addr] = f.depth
+
+		ve = ve.Elem()
+		if ve.Kind() == reflect.Interface {
+			if ve.IsNil() {
+				nilFound = true
+				break
+			}
+			ve = ve.Elem()
+		}
+	}
+
+	// Display type or indirection level depending on flags.
+	if showTypes && !f.ignoreNextType {
+		f.fs.Write(openParenBytes)
+		f.fs.Write(bytes.Repeat(asteriskBytes, indirects))
+		f.fs.Write([]byte(ve.Type().String()))
+		f.fs.Write(closeParenBytes)
+	} else {
+		if nilFound || cycleFound {
+			indirects += strings.Count(ve.Type().String(), "*")
+		}
+		f.fs.Write(openAngleBytes)
+		f.fs.Write([]byte(strings.Repeat("*", indirects)))
+		f.fs.Write(closeAngleBytes)
+	}
+
+	// Display pointer information depending on flags.
+	if f.fs.Flag('+') && (len(pointerChain) > 0) {
+		f.fs.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				f.fs.Write(pointerChainBytes)
+			}
+			printHexPtr(f.fs, addr)
+		}
+		f.fs.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	switch {
+	case nilFound:
+		f.fs.Write(nilAngleBytes)
+
+	case cycleFound:
+		f.fs.Write(circularShortBytes)
+
+	default:
+		f.ignoreNextType = true
+		f.format(ve)
+	}
+}
+
+// format is the main workhorse for providing the Formatter interface.  It
+// uses the passed reflect value to figure out what kind of object we are
+// dealing with and formats it appropriately.  It is a recursive function,
+// however circular data structures are detected and handled properly.
+func (f *formatState) format(v reflect.Value) {
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		f.fs.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		f.formatPtr(v)
+		return
+	}
+
+	// Print type information unless already handled elsewhere.
+	if !f.ignoreNextType && f.fs.Flag('#') {
+		f.fs.Write(openParenBytes)
+		f.fs.Write([]byte(v.Type().String()))
+		f.fs.Write(closeParenBytes)
+	}
+	f.ignoreNextType = false
+
+	// Call Stringer/error interfaces if they exist and the handle methods
+	// flag is enabled.
+	if !f.cs.DisableMethods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(f.cs, f.fs, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		// Do nothing.  We should never get here since invalid has already
+		// been handled above.
+
+	case reflect.Bool:
+		printBool(f.fs, v.Bool())
+
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		printInt(f.fs, v.Int(), 10)
+
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		printUint(f.fs, v.Uint(), 10)
+
+	case reflect.Float32:
+		printFloat(f.fs, v.Float(), 32)
+
+	case reflect.Float64:
+		printFloat(f.fs, v.Float(), 64)
+
+	case reflect.Complex64:
+		printComplex(f.fs, v.Complex(), 32)
+
+	case reflect.Complex128:
+		printComplex(f.fs, v.Complex(), 64)
+
+	case reflect.Slice:
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+
+	case reflect.Array:
+		f.fs.Write(openBracketBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			numEntries := v.Len()
+			for i := 0; i < numEntries; i++ {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				f.ignoreNextType = true
+				f.format(f.unpackValue(v.Index(i)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeBracketBytes)
+
+	case reflect.String:
+		f.fs.Write([]byte(v.String()))
+
+	case reflect.Interface:
+		// The only time we should get here is for nil interfaces due to
+		// unpackValue calls.
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+		}
+
+	case reflect.Ptr:
+		// Do nothing.  We should never get here since pointers have already
+		// been handled above.
+
+	case reflect.Map:
+		// nil maps should be indicated as different than empty maps
+		if v.IsNil() {
+			f.fs.Write(nilAngleBytes)
+			break
+		}
+
+		f.fs.Write(openMapBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			keys := v.MapKeys()
+			if f.cs.SortKeys {
+				sortValues(keys, f.cs)
+			}
+			for i, key := range keys {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				f.ignoreNextType = true
+				f.format(f.unpackValue(key))
+				f.fs.Write(colonBytes)
+				f.ignoreNextType = true
+				f.format(f.unpackValue(v.MapIndex(key)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeMapBytes)
+
+	case reflect.Struct:
+		numFields := v.NumField()
+		f.fs.Write(openBraceBytes)
+		f.depth++
+		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
+			f.fs.Write(maxShortBytes)
+		} else {
+			vt := v.Type()
+			for i := 0; i < numFields; i++ {
+				if i > 0 {
+					f.fs.Write(spaceBytes)
+				}
+				vtf := vt.Field(i)
+				if f.fs.Flag('+') || f.fs.Flag('#') {
+					f.fs.Write([]byte(vtf.Name))
+					f.fs.Write(colonBytes)
+				}
+				f.format(f.unpackValue(v.Field(i)))
+			}
+		}
+		f.depth--
+		f.fs.Write(closeBraceBytes)
+
+	case reflect.Uintptr:
+		printHexPtr(f.fs, uintptr(v.Uint()))
+
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		printHexPtr(f.fs, v.Pointer())
+
+	// There were not any other types at the time this code was written, but
+	// fall back to letting the default fmt package handle it if any get added.
+	default:
+		format := f.buildDefaultFormat()
+		if v.CanInterface() {
+			fmt.Fprintf(f.fs, format, v.Interface())
+		} else {
+			fmt.Fprintf(f.fs, format, v.String())
+		}
+	}
+}
+
+// Format satisfies the fmt.Formatter interface. See NewFormatter for usage
+// details.
+func (f *formatState) Format(fs fmt.State, verb rune) {
+	f.fs = fs
+
+	// Use standard formatting for verbs that are not v.
+	if verb != 'v' {
+		format := f.constructOrigFormat(verb)
+		fmt.Fprintf(fs, format, f.value)
+		return
+	}
+
+	if f.value == nil {
+		if fs.Flag('#') {
+			fs.Write(interfaceBytes)
+		}
+		fs.Write(nilAngleBytes)
+		return
+	}
+
+	f.format(reflect.ValueOf(f.value))
+}
+
+// newFormatter is a helper function to consolidate the logic from the various
+// public methods which take varying config states.
+func newFormatter(cs *ConfigState, v interface{}) fmt.Formatter {
+	fs := &formatState{value: v, cs: cs}
+	fs.pointers = make(map[uintptr]int)
+	return fs
+}
+
+/*
+NewFormatter returns a custom formatter that satisfies the fmt.Formatter
+interface.  As a result, it integrates cleanly with standard fmt package
+printing functions.  The formatter is useful for inline printing of smaller data
+types similar to the standard %v format specifier.
+
+The custom formatter only responds to the %v (most compact), %+v (adds pointer
+addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
+combinations.  Any other verbs such as %x and %q will be sent to the the
+standard fmt package for formatting.  In addition, the custom formatter ignores
+the width and precision arguments (however they will still work on the format
+specifiers not handled by the custom formatter).
+
+Typically this function shouldn't be called directly.  It is much easier to make
+use of the custom formatter by calling one of the convenience functions such as
+Printf, Println, or Fprintf.
+*/
+func NewFormatter(v interface{}) fmt.Formatter {
+	return newFormatter(&Config, v)
+}
diff --git a/go/vendor/github.com/davecgh/go-spew/spew/spew.go b/go/vendor/github.com/davecgh/go-spew/spew/spew.go
new file mode 100644
index 0000000..32c0e33
--- /dev/null
+++ b/go/vendor/github.com/davecgh/go-spew/spew/spew.go
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+package spew
+
+import (
+	"fmt"
+	"io"
+)
+
+// Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the formatted string as a value that satisfies error.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Errorf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Errorf(format string, a ...interface{}) (err error) {
+	return fmt.Errorf(format, convertArgs(a)...)
+}
+
+// Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprint(w, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprint(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprint(w, convertArgs(a)...)
+}
+
+// Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintf(w, format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(w, format, convertArgs(a)...)
+}
+
+// Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
+// passed with a default Formatter interface returned by NewFormatter.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Fprintln(w, spew.NewFormatter(a), spew.NewFormatter(b))
+func Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(w, convertArgs(a)...)
+}
+
+// Print is a wrapper for fmt.Print that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Print(spew.NewFormatter(a), spew.NewFormatter(b))
+func Print(a ...interface{}) (n int, err error) {
+	return fmt.Print(convertArgs(a)...)
+}
+
+// Printf is a wrapper for fmt.Printf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Printf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Printf(format, convertArgs(a)...)
+}
+
+// Println is a wrapper for fmt.Println that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the number of bytes written and any write error encountered.  See
+// NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Println(spew.NewFormatter(a), spew.NewFormatter(b))
+func Println(a ...interface{}) (n int, err error) {
+	return fmt.Println(convertArgs(a)...)
+}
+
+// Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprint(spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprint(a ...interface{}) string {
+	return fmt.Sprint(convertArgs(a)...)
+}
+
+// Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
+// passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintf(format, spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprintf(format string, a ...interface{}) string {
+	return fmt.Sprintf(format, convertArgs(a)...)
+}
+
+// Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
+// were passed with a default Formatter interface returned by NewFormatter.  It
+// returns the resulting string.  See NewFormatter for formatting details.
+//
+// This function is shorthand for the following syntax:
+//
+//	fmt.Sprintln(spew.NewFormatter(a), spew.NewFormatter(b))
+func Sprintln(a ...interface{}) string {
+	return fmt.Sprintln(convertArgs(a)...)
+}
+
+// convertArgs accepts a slice of arguments and returns a slice of the same
+// length with each argument converted to a default spew Formatter interface.
+func convertArgs(args []interface{}) (formatters []interface{}) {
+	formatters = make([]interface{}, len(args))
+	for index, arg := range args {
+		formatters[index] = NewFormatter(arg)
+	}
+	return formatters
+}
diff --git a/go/vendor/github.com/pmezard/go-difflib/LICENSE b/go/vendor/github.com/pmezard/go-difflib/LICENSE
new file mode 100644
index 0000000..c67dad6
--- /dev/null
+++ b/go/vendor/github.com/pmezard/go-difflib/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2013, Patrick Mezard
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+    Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+    The names of its contributors may not be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/go/vendor/github.com/pmezard/go-difflib/difflib/difflib.go b/go/vendor/github.com/pmezard/go-difflib/difflib/difflib.go
new file mode 100644
index 0000000..003e99f
--- /dev/null
+++ b/go/vendor/github.com/pmezard/go-difflib/difflib/difflib.go
@@ -0,0 +1,772 @@
+// Package difflib is a partial port of Python difflib module.
+//
+// It provides tools to compare sequences of strings and generate textual diffs.
+//
+// The following class and functions have been ported:
+//
+// - SequenceMatcher
+//
+// - unified_diff
+//
+// - context_diff
+//
+// Getting unified diffs was the main goal of the port. Keep in mind this code
+// is mostly suitable to output text differences in a human friendly way, there
+// are no guarantees generated diffs are consumable by patch(1).
+package difflib
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+)
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func calculateRatio(matches, length int) float64 {
+	if length > 0 {
+		return 2.0 * float64(matches) / float64(length)
+	}
+	return 1.0
+}
+
+type Match struct {
+	A    int
+	B    int
+	Size int
+}
+
+type OpCode struct {
+	Tag byte
+	I1  int
+	I2  int
+	J1  int
+	J2  int
+}
+
+// SequenceMatcher compares sequence of strings. The basic
+// algorithm predates, and is a little fancier than, an algorithm
+// published in the late 1980's by Ratcliff and Obershelp under the
+// hyperbolic name "gestalt pattern matching".  The basic idea is to find
+// the longest contiguous matching subsequence that contains no "junk"
+// elements (R-O doesn't address junk).  The same idea is then applied
+// recursively to the pieces of the sequences to the left and to the right
+// of the matching subsequence.  This does not yield minimal edit
+// sequences, but does tend to yield matches that "look right" to people.
+//
+// SequenceMatcher tries to compute a "human-friendly diff" between two
+// sequences.  Unlike e.g. UNIX(tm) diff, the fundamental notion is the
+// longest *contiguous* & junk-free matching subsequence.  That's what
+// catches peoples' eyes.  The Windows(tm) windiff has another interesting
+// notion, pairing up elements that appear uniquely in each sequence.
+// That, and the method here, appear to yield more intuitive difference
+// reports than does diff.  This method appears to be the least vulnerable
+// to synching up on blocks of "junk lines", though (like blank lines in
+// ordinary text files, or maybe "<P>" lines in HTML files).  That may be
+// because this is the only method of the 3 that has a *concept* of
+// "junk" <wink>.
+//
+// Timing:  Basic R-O is cubic time worst case and quadratic time expected
+// case.  SequenceMatcher is quadratic time for the worst case and has
+// expected-case behavior dependent in a complicated way on how many
+// elements the sequences have in common; best case time is linear.
+type SequenceMatcher struct {
+	a              []string
+	b              []string
+	b2j            map[string][]int
+	IsJunk         func(string) bool
+	autoJunk       bool
+	bJunk          map[string]struct{}
+	matchingBlocks []Match
+	fullBCount     map[string]int
+	bPopular       map[string]struct{}
+	opCodes        []OpCode
+}
+
+func NewMatcher(a, b []string) *SequenceMatcher {
+	m := SequenceMatcher{autoJunk: true}
+	m.SetSeqs(a, b)
+	return &m
+}
+
+func NewMatcherWithJunk(a, b []string, autoJunk bool,
+	isJunk func(string) bool) *SequenceMatcher {
+
+	m := SequenceMatcher{IsJunk: isJunk, autoJunk: autoJunk}
+	m.SetSeqs(a, b)
+	return &m
+}
+
+// Set two sequences to be compared.
+func (m *SequenceMatcher) SetSeqs(a, b []string) {
+	m.SetSeq1(a)
+	m.SetSeq2(b)
+}
+
+// Set the first sequence to be compared. The second sequence to be compared is
+// not changed.
+//
+// SequenceMatcher computes and caches detailed information about the second
+// sequence, so if you want to compare one sequence S against many sequences,
+// use .SetSeq2(s) once and call .SetSeq1(x) repeatedly for each of the other
+// sequences.
+//
+// See also SetSeqs() and SetSeq2().
+func (m *SequenceMatcher) SetSeq1(a []string) {
+	if &a == &m.a {
+		return
+	}
+	m.a = a
+	m.matchingBlocks = nil
+	m.opCodes = nil
+}
+
+// Set the second sequence to be compared. The first sequence to be compared is
+// not changed.
+func (m *SequenceMatcher) SetSeq2(b []string) {
+	if &b == &m.b {
+		return
+	}
+	m.b = b
+	m.matchingBlocks = nil
+	m.opCodes = nil
+	m.fullBCount = nil
+	m.chainB()
+}
+
+func (m *SequenceMatcher) chainB() {
+	// Populate line -> index mapping
+	b2j := map[string][]int{}
+	for i, s := range m.b {
+		indices := b2j[s]
+		indices = append(indices, i)
+		b2j[s] = indices
+	}
+
+	// Purge junk elements
+	m.bJunk = map[string]struct{}{}
+	if m.IsJunk != nil {
+		junk := m.bJunk
+		for s, _ := range b2j {
+			if m.IsJunk(s) {
+				junk[s] = struct{}{}
+			}
+		}
+		for s, _ := range junk {
+			delete(b2j, s)
+		}
+	}
+
+	// Purge remaining popular elements
+	popular := map[string]struct{}{}
+	n := len(m.b)
+	if m.autoJunk && n >= 200 {
+		ntest := n/100 + 1
+		for s, indices := range b2j {
+			if len(indices) > ntest {
+				popular[s] = struct{}{}
+			}
+		}
+		for s, _ := range popular {
+			delete(b2j, s)
+		}
+	}
+	m.bPopular = popular
+	m.b2j = b2j
+}
+
+func (m *SequenceMatcher) isBJunk(s string) bool {
+	_, ok := m.bJunk[s]
+	return ok
+}
+
+// Find longest matching block in a[alo:ahi] and b[blo:bhi].
+//
+// If IsJunk is not defined:
+//
+// Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
+//     alo <= i <= i+k <= ahi
+//     blo <= j <= j+k <= bhi
+// and for all (i',j',k') meeting those conditions,
+//     k >= k'
+//     i <= i'
+//     and if i == i', j <= j'
+//
+// In other words, of all maximal matching blocks, return one that
+// starts earliest in a, and of all those maximal matching blocks that
+// start earliest in a, return the one that starts earliest in b.
+//
+// If IsJunk is defined, first the longest matching block is
+// determined as above, but with the additional restriction that no
+// junk element appears in the block.  Then that block is extended as
+// far as possible by matching (only) junk elements on both sides.  So
+// the resulting block never matches on junk except as identical junk
+// happens to be adjacent to an "interesting" match.
+//
+// If no blocks match, return (alo, blo, 0).
+func (m *SequenceMatcher) findLongestMatch(alo, ahi, blo, bhi int) Match {
+	// CAUTION:  stripping common prefix or suffix would be incorrect.
+	// E.g.,
+	//    ab
+	//    acab
+	// Longest matching block is "ab", but if common prefix is
+	// stripped, it's "a" (tied with "b").  UNIX(tm) diff does so
+	// strip, so ends up claiming that ab is changed to acab by
+	// inserting "ca" in the middle.  That's minimal but unintuitive:
+	// "it's obvious" that someone inserted "ac" at the front.
+	// Windiff ends up at the same place as diff, but by pairing up
+	// the unique 'b's and then matching the first two 'a's.
+	besti, bestj, bestsize := alo, blo, 0
+
+	// find longest junk-free match
+	// during an iteration of the loop, j2len[j] = length of longest
+	// junk-free match ending with a[i-1] and b[j]
+	j2len := map[int]int{}
+	for i := alo; i != ahi; i++ {
+		// look at all instances of a[i] in b; note that because
+		// b2j has no junk keys, the loop is skipped if a[i] is junk
+		newj2len := map[int]int{}
+		for _, j := range m.b2j[m.a[i]] {
+			// a[i] matches b[j]
+			if j < blo {
+				continue
+			}
+			if j >= bhi {
+				break
+			}
+			k := j2len[j-1] + 1
+			newj2len[j] = k
+			if k > bestsize {
+				besti, bestj, bestsize = i-k+1, j-k+1, k
+			}
+		}
+		j2len = newj2len
+	}
+
+	// Extend the best by non-junk elements on each end.  In particular,
+	// "popular" non-junk elements aren't in b2j, which greatly speeds
+	// the inner loop above, but also means "the best" match so far
+	// doesn't contain any junk *or* popular non-junk elements.
+	for besti > alo && bestj > blo && !m.isBJunk(m.b[bestj-1]) &&
+		m.a[besti-1] == m.b[bestj-1] {
+		besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
+	}
+	for besti+bestsize < ahi && bestj+bestsize < bhi &&
+		!m.isBJunk(m.b[bestj+bestsize]) &&
+		m.a[besti+bestsize] == m.b[bestj+bestsize] {
+		bestsize += 1
+	}
+
+	// Now that we have a wholly interesting match (albeit possibly
+	// empty!), we may as well suck up the matching junk on each
+	// side of it too.  Can't think of a good reason not to, and it
+	// saves post-processing the (possibly considerable) expense of
+	// figuring out what to do with it.  In the case of an empty
+	// interesting match, this is clearly the right thing to do,
+	// because no other kind of match is possible in the regions.
+	for besti > alo && bestj > blo && m.isBJunk(m.b[bestj-1]) &&
+		m.a[besti-1] == m.b[bestj-1] {
+		besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
+	}
+	for besti+bestsize < ahi && bestj+bestsize < bhi &&
+		m.isBJunk(m.b[bestj+bestsize]) &&
+		m.a[besti+bestsize] == m.b[bestj+bestsize] {
+		bestsize += 1
+	}
+
+	return Match{A: besti, B: bestj, Size: bestsize}
+}
+
+// Return list of triples describing matching subsequences.
+//
+// Each triple is of the form (i, j, n), and means that
+// a[i:i+n] == b[j:j+n].  The triples are monotonically increasing in
+// i and in j. It's also guaranteed that if (i, j, n) and (i', j', n') are
+// adjacent triples in the list, and the second is not the last triple in the
+// list, then i+n != i' or j+n != j'. IOW, adjacent triples never describe
+// adjacent equal blocks.
+//
+// The last triple is a dummy, (len(a), len(b), 0), and is the only
+// triple with n==0.
+func (m *SequenceMatcher) GetMatchingBlocks() []Match {
+	if m.matchingBlocks != nil {
+		return m.matchingBlocks
+	}
+
+	var matchBlocks func(alo, ahi, blo, bhi int, matched []Match) []Match
+	matchBlocks = func(alo, ahi, blo, bhi int, matched []Match) []Match {
+		match := m.findLongestMatch(alo, ahi, blo, bhi)
+		i, j, k := match.A, match.B, match.Size
+		if match.Size > 0 {
+			if alo < i && blo < j {
+				matched = matchBlocks(alo, i, blo, j, matched)
+			}
+			matched = append(matched, match)
+			if i+k < ahi && j+k < bhi {
+				matched = matchBlocks(i+k, ahi, j+k, bhi, matched)
+			}
+		}
+		return matched
+	}
+	matched := matchBlocks(0, len(m.a), 0, len(m.b), nil)
+
+	// It's possible that we have adjacent equal blocks in the
+	// matching_blocks list now.
+	nonAdjacent := []Match{}
+	i1, j1, k1 := 0, 0, 0
+	for _, b := range matched {
+		// Is this block adjacent to i1, j1, k1?
+		i2, j2, k2 := b.A, b.B, b.Size
+		if i1+k1 == i2 && j1+k1 == j2 {
+			// Yes, so collapse them -- this just increases the length of
+			// the first block by the length of the second, and the first
+			// block so lengthened remains the block to compare against.
+			k1 += k2
+		} else {
+			// Not adjacent.  Remember the first block (k1==0 means it's
+			// the dummy we started with), and make the second block the
+			// new block to compare against.
+			if k1 > 0 {
+				nonAdjacent = append(nonAdjacent, Match{i1, j1, k1})
+			}
+			i1, j1, k1 = i2, j2, k2
+		}
+	}
+	if k1 > 0 {
+		nonAdjacent = append(nonAdjacent, Match{i1, j1, k1})
+	}
+
+	nonAdjacent = append(nonAdjacent, Match{len(m.a), len(m.b), 0})
+	m.matchingBlocks = nonAdjacent
+	return m.matchingBlocks
+}
+
+// Return list of 5-tuples describing how to turn a into b.
+//
+// Each tuple is of the form (tag, i1, i2, j1, j2).  The first tuple
+// has i1 == j1 == 0, and remaining tuples have i1 == the i2 from the
+// tuple preceding it, and likewise for j1 == the previous j2.
+//
+// The tags are characters, with these meanings:
+//
+// 'r' (replace):  a[i1:i2] should be replaced by b[j1:j2]
+//
+// 'd' (delete):   a[i1:i2] should be deleted, j1==j2 in this case.
+//
+// 'i' (insert):   b[j1:j2] should be inserted at a[i1:i1], i1==i2 in this case.
+//
+// 'e' (equal):    a[i1:i2] == b[j1:j2]
+func (m *SequenceMatcher) GetOpCodes() []OpCode {
+	if m.opCodes != nil {
+		return m.opCodes
+	}
+	i, j := 0, 0
+	matching := m.GetMatchingBlocks()
+	opCodes := make([]OpCode, 0, len(matching))
+	for _, m := range matching {
+		//  invariant:  we've pumped out correct diffs to change
+		//  a[:i] into b[:j], and the next matching block is
+		//  a[ai:ai+size] == b[bj:bj+size]. So we need to pump
+		//  out a diff to change a[i:ai] into b[j:bj], pump out
+		//  the matching block, and move (i,j) beyond the match
+		ai, bj, size := m.A, m.B, m.Size
+		tag := byte(0)
+		if i < ai && j < bj {
+			tag = 'r'
+		} else if i < ai {
+			tag = 'd'
+		} else if j < bj {
+			tag = 'i'
+		}
+		if tag > 0 {
+			opCodes = append(opCodes, OpCode{tag, i, ai, j, bj})
+		}
+		i, j = ai+size, bj+size
+		// the list of matching blocks is terminated by a
+		// sentinel with size 0
+		if size > 0 {
+			opCodes = append(opCodes, OpCode{'e', ai, i, bj, j})
+		}
+	}
+	m.opCodes = opCodes
+	return m.opCodes
+}
+
+// Isolate change clusters by eliminating ranges with no changes.
+//
+// Return a generator of groups with up to n lines of context.
+// Each group is in the same format as returned by GetOpCodes().
+func (m *SequenceMatcher) GetGroupedOpCodes(n int) [][]OpCode {
+	if n < 0 {
+		n = 3
+	}
+	codes := m.GetOpCodes()
+	if len(codes) == 0 {
+		codes = []OpCode{OpCode{'e', 0, 1, 0, 1}}
+	}
+	// Fixup leading and trailing groups if they show no changes.
+	if codes[0].Tag == 'e' {
+		c := codes[0]
+		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+		codes[0] = OpCode{c.Tag, max(i1, i2-n), i2, max(j1, j2-n), j2}
+	}
+	if codes[len(codes)-1].Tag == 'e' {
+		c := codes[len(codes)-1]
+		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+		codes[len(codes)-1] = OpCode{c.Tag, i1, min(i2, i1+n), j1, min(j2, j1+n)}
+	}
+	nn := n + n
+	groups := [][]OpCode{}
+	group := []OpCode{}
+	for _, c := range codes {
+		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+		// End the current group and start a new one whenever
+		// there is a large range with no changes.
+		if c.Tag == 'e' && i2-i1 > nn {
+			group = append(group, OpCode{c.Tag, i1, min(i2, i1+n),
+				j1, min(j2, j1+n)})
+			groups = append(groups, group)
+			group = []OpCode{}
+			i1, j1 = max(i1, i2-n), max(j1, j2-n)
+		}
+		group = append(group, OpCode{c.Tag, i1, i2, j1, j2})
+	}
+	if len(group) > 0 && !(len(group) == 1 && group[0].Tag == 'e') {
+		groups = append(groups, group)
+	}
+	return groups
+}
+
+// Return a measure of the sequences' similarity (float in [0,1]).
+//
+// Where T is the total number of elements in both sequences, and
+// M is the number of matches, this is 2.0*M / T.
+// Note that this is 1 if the sequences are identical, and 0 if
+// they have nothing in common.
+//
+// .Ratio() is expensive to compute if you haven't already computed
+// .GetMatchingBlocks() or .GetOpCodes(), in which case you may
+// want to try .QuickRatio() or .RealQuickRation() first to get an
+// upper bound.
+func (m *SequenceMatcher) Ratio() float64 {
+	matches := 0
+	for _, m := range m.GetMatchingBlocks() {
+		matches += m.Size
+	}
+	return calculateRatio(matches, len(m.a)+len(m.b))
+}
+
+// Return an upper bound on ratio() relatively quickly.
+//
+// This isn't defined beyond that it is an upper bound on .Ratio(), and
+// is faster to compute.
+func (m *SequenceMatcher) QuickRatio() float64 {
+	// viewing a and b as multisets, set matches to the cardinality
+	// of their intersection; this counts the number of matches
+	// without regard to order, so is clearly an upper bound
+	if m.fullBCount == nil {
+		m.fullBCount = map[string]int{}
+		for _, s := range m.b {
+			m.fullBCount[s] = m.fullBCount[s] + 1
+		}
+	}
+
+	// avail[x] is the number of times x appears in 'b' less the
+	// number of times we've seen it in 'a' so far ... kinda
+	avail := map[string]int{}
+	matches := 0
+	for _, s := range m.a {
+		n, ok := avail[s]
+		if !ok {
+			n = m.fullBCount[s]
+		}
+		avail[s] = n - 1
+		if n > 0 {
+			matches += 1
+		}
+	}
+	return calculateRatio(matches, len(m.a)+len(m.b))
+}
+
+// Return an upper bound on ratio() very quickly.
+//
+// This isn't defined beyond that it is an upper bound on .Ratio(), and
+// is faster to compute than either .Ratio() or .QuickRatio().
+func (m *SequenceMatcher) RealQuickRatio() float64 {
+	la, lb := len(m.a), len(m.b)
+	return calculateRatio(min(la, lb), la+lb)
+}
+
+// Convert range to the "ed" format
+func formatRangeUnified(start, stop int) string {
+	// Per the diff spec at http://www.unix.org/single_unix_specification/
+	beginning := start + 1 // lines start numbering with one
+	length := stop - start
+	if length == 1 {
+		return fmt.Sprintf("%d", beginning)
+	}
+	if length == 0 {
+		beginning -= 1 // empty ranges begin at line just before the range
+	}
+	return fmt.Sprintf("%d,%d", beginning, length)
+}
+
+// Unified diff parameters
+type UnifiedDiff struct {
+	A        []string // First sequence lines
+	FromFile string   // First file name
+	FromDate string   // First file time
+	B        []string // Second sequence lines
+	ToFile   string   // Second file name
+	ToDate   string   // Second file time
+	Eol      string   // Headers end of line, defaults to LF
+	Context  int      // Number of context lines
+}
+
+// Compare two sequences of lines; generate the delta as a unified diff.
+//
+// Unified diffs are a compact way of showing line changes and a few
+// lines of context.  The number of context lines is set by 'n' which
+// defaults to three.
+//
+// By default, the diff control lines (those with ---, +++, or @@) are
+// created with a trailing newline.  This is helpful so that inputs
+// created from file.readlines() result in diffs that are suitable for
+// file.writelines() since both the inputs and outputs have trailing
+// newlines.
+//
+// For inputs that do not have trailing newlines, set the lineterm
+// argument to "" so that the output will be uniformly newline free.
+//
+// The unidiff format normally has a header for filenames and modification
+// times.  Any or all of these may be specified using strings for
+// 'fromfile', 'tofile', 'fromfiledate', and 'tofiledate'.
+// The modification times are normally expressed in the ISO 8601 format.
+func WriteUnifiedDiff(writer io.Writer, diff UnifiedDiff) error {
+	buf := bufio.NewWriter(writer)
+	defer buf.Flush()
+	wf := func(format string, args ...interface{}) error {
+		_, err := buf.WriteString(fmt.Sprintf(format, args...))
+		return err
+	}
+	ws := func(s string) error {
+		_, err := buf.WriteString(s)
+		return err
+	}
+
+	if len(diff.Eol) == 0 {
+		diff.Eol = "\n"
+	}
+
+	started := false
+	m := NewMatcher(diff.A, diff.B)
+	for _, g := range m.GetGroupedOpCodes(diff.Context) {
+		if !started {
+			started = true
+			fromDate := ""
+			if len(diff.FromDate) > 0 {
+				fromDate = "\t" + diff.FromDate
+			}
+			toDate := ""
+			if len(diff.ToDate) > 0 {
+				toDate = "\t" + diff.ToDate
+			}
+			if diff.FromFile != "" || diff.ToFile != "" {
+				err := wf("--- %s%s%s", diff.FromFile, fromDate, diff.Eol)
+				if err != nil {
+					return err
+				}
+				err = wf("+++ %s%s%s", diff.ToFile, toDate, diff.Eol)
+				if err != nil {
+					return err
+				}
+			}
+		}
+		first, last := g[0], g[len(g)-1]
+		range1 := formatRangeUnified(first.I1, last.I2)
+		range2 := formatRangeUnified(first.J1, last.J2)
+		if err := wf("@@ -%s +%s @@%s", range1, range2, diff.Eol); err != nil {
+			return err
+		}
+		for _, c := range g {
+			i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
+			if c.Tag == 'e' {
+				for _, line := range diff.A[i1:i2] {
+					if err := ws(" " + line); err != nil {
+						return err
+					}
+				}
+				continue
+			}
+			if c.Tag == 'r' || c.Tag == 'd' {
+				for _, line := range diff.A[i1:i2] {
+					if err := ws("-" + line); err != nil {
+						return err
+					}
+				}
+			}
+			if c.Tag == 'r' || c.Tag == 'i' {
+				for _, line := range diff.B[j1:j2] {
+					if err := ws("+" + line); err != nil {
+						return err
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// Like WriteUnifiedDiff but returns the diff a string.
+func GetUnifiedDiffString(diff UnifiedDiff) (string, error) {
+	w := &bytes.Buffer{}
+	err := WriteUnifiedDiff(w, diff)
+	return string(w.Bytes()), err
+}
+
+// Convert range to the "ed" format.
+func formatRangeContext(start, stop int) string {
+	// Per the diff spec at http://www.unix.org/single_unix_specification/
+	beginning := start + 1 // lines start numbering with one
+	length := stop - start
+	if length == 0 {
+		beginning -= 1 // empty ranges begin at line just before the range
+	}
+	if length <= 1 {
+		return fmt.Sprintf("%d", beginning)
+	}
+	return fmt.Sprintf("%d,%d", beginning, beginning+length-1)
+}
+
+type ContextDiff UnifiedDiff
+
+// Compare two sequences of lines; generate the delta as a context diff.
+//
+// Context diffs are a compact way of showing line changes and a few
+// lines of context. The number of context lines is set by diff.Context
+// which defaults to three.
+//
+// By default, the diff control lines (those with *** or ---) are
+// created with a trailing newline.
+//
+// For inputs that do not have trailing newlines, set the diff.Eol
+// argument to "" so that the output will be uniformly newline free.
+//
+// The context diff format normally has a header for filenames and
+// modification times.  Any or all of these may be specified using
+// strings for diff.FromFile, diff.ToFile, diff.FromDate, diff.ToDate.
+// The modification times are normally expressed in the ISO 8601 format.
+// If not specified, the strings default to blanks.
+func WriteContextDiff(writer io.Writer, diff ContextDiff) error {
+	buf := bufio.NewWriter(writer)
+	defer buf.Flush()
+	var diffErr error
+	wf := func(format string, args ...interface{}) {
+		_, err := buf.WriteString(fmt.Sprintf(format, args...))
+		if diffErr == nil && err != nil {
+			diffErr = err
+		}
+	}
+	ws := func(s string) {
+		_, err := buf.WriteString(s)
+		if diffErr == nil && err != nil {
+			diffErr = err
+		}
+	}
+
+	if len(diff.Eol) == 0 {
+		diff.Eol = "\n"
+	}
+
+	prefix := map[byte]string{
+		'i': "+ ",
+		'd': "- ",
+		'r': "! ",
+		'e': "  ",
+	}
+
+	started := false
+	m := NewMatcher(diff.A, diff.B)
+	for _, g := range m.GetGroupedOpCodes(diff.Context) {
+		if !started {
+			started = true
+			fromDate := ""
+			if len(diff.FromDate) > 0 {
+				fromDate = "\t" + diff.FromDate
+			}
+			toDate := ""
+			if len(diff.ToDate) > 0 {
+				toDate = "\t" + diff.ToDate
+			}
+			if diff.FromFile != "" || diff.ToFile != "" {
+				wf("*** %s%s%s", diff.FromFile, fromDate, diff.Eol)
+				wf("--- %s%s%s", diff.ToFile, toDate, diff.Eol)
+			}
+		}
+
+		first, last := g[0], g[len(g)-1]
+		ws("***************" + diff.Eol)
+
+		range1 := formatRangeContext(first.I1, last.I2)
+		wf("*** %s ****%s", range1, diff.Eol)
+		for _, c := range g {
+			if c.Tag == 'r' || c.Tag == 'd' {
+				for _, cc := range g {
+					if cc.Tag == 'i' {
+						continue
+					}
+					for _, line := range diff.A[cc.I1:cc.I2] {
+						ws(prefix[cc.Tag] + line)
+					}
+				}
+				break
+			}
+		}
+
+		range2 := formatRangeContext(first.J1, last.J2)
+		wf("--- %s ----%s", range2, diff.Eol)
+		for _, c := range g {
+			if c.Tag == 'r' || c.Tag == 'i' {
+				for _, cc := range g {
+					if cc.Tag == 'd' {
+						continue
+					}
+					for _, line := range diff.B[cc.J1:cc.J2] {
+						ws(prefix[cc.Tag] + line)
+					}
+				}
+				break
+			}
+		}
+	}
+	return diffErr
+}
+
+// Like WriteContextDiff but returns the diff a string.
+func GetContextDiffString(diff ContextDiff) (string, error) {
+	w := &bytes.Buffer{}
+	err := WriteContextDiff(w, diff)
+	return string(w.Bytes()), err
+}
+
+// Split a string on "\n" while preserving them. The output can be used
+// as input for UnifiedDiff and ContextDiff structures.
+func SplitLines(s string) []string {
+	lines := strings.SplitAfter(s, "\n")
+	lines[len(lines)-1] += "\n"
+	return lines
+}
diff --git a/go/vendor/github.com/stretchr/objx/Gopkg.lock b/go/vendor/github.com/stretchr/objx/Gopkg.lock
new file mode 100644
index 0000000..d527288
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/Gopkg.lock
@@ -0,0 +1,39 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  digest = "1:ffe9824d294da03b391f44e1ae8281281b4afc1bdaa9588c9097785e3af10cec"
+  name = "github.com/davecgh/go-spew"
+  packages = ["spew"]
+  pruneopts = "NUT"
+  revision = "8991bc29aa16c548c550c7ff78260e27b9ab7c73"
+  version = "v1.1.1"
+
+[[projects]]
+  digest = "1:0028cb19b2e4c3112225cd871870f2d9cf49b9b4276531f03438a88e94be86fe"
+  name = "github.com/pmezard/go-difflib"
+  packages = ["difflib"]
+  pruneopts = "NUT"
+  revision = "792786c7400a136282c1664665ae0a8db921c6c2"
+  version = "v1.0.0"
+
+[[projects]]
+  digest = "1:0331452965d8695c0a5633e0f509012987681a654f388f2ad0c3b2d7f7004b1c"
+  name = "github.com/stretchr/testify"
+  packages = [
+    "assert",
+    "require",
+  ]
+  pruneopts = "NUT"
+  revision = "f35b8ab0b5a2cef36673838d662e249dd9c94686"
+  version = "v1.2.2"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  input-imports = [
+    "github.com/stretchr/testify/assert",
+    "github.com/stretchr/testify/require",
+  ]
+  solver-name = "gps-cdcl"
+  solver-version = 1
diff --git a/go/vendor/github.com/stretchr/objx/Gopkg.toml b/go/vendor/github.com/stretchr/objx/Gopkg.toml
new file mode 100644
index 0000000..d70f157
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/Gopkg.toml
@@ -0,0 +1,8 @@
+[prune]
+  unused-packages = true
+  non-go = true
+  go-tests = true
+
+[[constraint]]
+  name = "github.com/stretchr/testify"
+  version = "~1.2.0"
diff --git a/go/vendor/github.com/stretchr/objx/LICENSE b/go/vendor/github.com/stretchr/objx/LICENSE
new file mode 100644
index 0000000..44d4d9d
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/LICENSE
@@ -0,0 +1,22 @@
+The MIT License
+
+Copyright (c) 2014 Stretchr, Inc.
+Copyright (c) 2017-2018 objx contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/go/vendor/github.com/stretchr/objx/README.md b/go/vendor/github.com/stretchr/objx/README.md
new file mode 100644
index 0000000..fb1618c
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/README.md
@@ -0,0 +1,80 @@
+# Objx
+[![Build Status](https://travis-ci.org/stretchr/objx.svg?branch=master)](https://travis-ci.org/stretchr/objx)
+[![Go Report Card](https://goreportcard.com/badge/github.com/stretchr/objx)](https://goreportcard.com/report/github.com/stretchr/objx)
+[![Maintainability](https://api.codeclimate.com/v1/badges/1d64bc6c8474c2074f2b/maintainability)](https://codeclimate.com/github/stretchr/objx/maintainability)
+[![Test Coverage](https://api.codeclimate.com/v1/badges/1d64bc6c8474c2074f2b/test_coverage)](https://codeclimate.com/github/stretchr/objx/test_coverage)
+[![Sourcegraph](https://sourcegraph.com/github.com/stretchr/objx/-/badge.svg)](https://sourcegraph.com/github.com/stretchr/objx)
+[![GoDoc](https://godoc.org/github.com/stretchr/objx?status.svg)](https://godoc.org/github.com/stretchr/objx)
+
+Objx - Go package for dealing with maps, slices, JSON and other data.
+
+Get started:
+
+- Install Objx with [one line of code](#installation), or [update it with another](#staying-up-to-date)
+- Check out the API Documentation http://godoc.org/github.com/stretchr/objx
+
+## Overview
+Objx provides the `objx.Map` type, which is a `map[string]interface{}` that exposes a powerful `Get` method (among others) that allows you to easily and quickly get access to data within the map, without having to worry too much about type assertions, missing data, default values etc.
+
+### Pattern
+Objx uses a preditable pattern to make access data from within `map[string]interface{}` easy. Call one of the `objx.` functions to create your `objx.Map` to get going:
+
+    m, err := objx.FromJSON(json)
+
+NOTE: Any methods or functions with the `Must` prefix will panic if something goes wrong, the rest will be optimistic and try to figure things out without panicking.
+
+Use `Get` to access the value you're interested in.  You can use dot and array
+notation too:
+
+     m.Get("places[0].latlng")
+
+Once you have sought the `Value` you're interested in, you can use the `Is*` methods to determine its type.
+
+     if m.Get("code").IsStr() { // Your code... }
+
+Or you can just assume the type, and use one of the strong type methods to extract the real value:
+
+    m.Get("code").Int()
+
+If there's no value there (or if it's the wrong type) then a default value will be returned, or you can be explicit about the default value.
+
+     Get("code").Int(-1)
+
+If you're dealing with a slice of data as a value, Objx provides many useful methods for iterating, manipulating and selecting that data.  You can find out more by exploring the index below.
+
+### Reading data
+A simple example of how to use Objx:
+
+    // Use MustFromJSON to make an objx.Map from some JSON
+    m := objx.MustFromJSON(`{"name": "Mat", "age": 30}`)
+
+    // Get the details
+    name := m.Get("name").Str()
+    age := m.Get("age").Int()
+
+    // Get their nickname (or use their name if they don't have one)
+    nickname := m.Get("nickname").Str(name)
+
+### Ranging
+Since `objx.Map` is a `map[string]interface{}` you can treat it as such.  For example, to `range` the data, do what you would expect:
+
+    m := objx.MustFromJSON(json)
+    for key, value := range m {
+      // Your code...
+    }
+
+## Installation
+To install Objx, use go get:
+
+    go get github.com/stretchr/objx
+
+### Staying up to date
+To update Objx to the latest version, run:
+
+    go get -u github.com/stretchr/objx
+
+### Supported go versions
+We support the lastest three major Go versions, which are 1.9, 1.10 and 1.11 at the moment.
+
+## Contributing
+Please feel free to submit issues, fork the repository and send pull requests!
diff --git a/go/vendor/github.com/stretchr/objx/Taskfile.yml b/go/vendor/github.com/stretchr/objx/Taskfile.yml
new file mode 100644
index 0000000..a3c5223
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/Taskfile.yml
@@ -0,0 +1,30 @@
+default:
+  deps: [test]
+
+update-deps:
+  desc: Updates dependencies
+  cmds:
+    - dep ensure
+    - dep ensure -update
+
+lint:
+  desc: Checks code style
+  cmds:
+    - gofmt -d -s *.go
+    - go vet .
+  silent: true
+
+lint-fix:
+  desc: Fixes code style
+  cmds:
+    - gofmt -w -s *.go
+
+test:
+  desc: Runs go tests
+  cmds:
+    - go test -race  .
+
+test-coverage:
+  desc: Runs go tests and calucates test coverage
+  cmds:
+    - go test -coverprofile=c.out .
diff --git a/go/vendor/github.com/stretchr/objx/accessors.go b/go/vendor/github.com/stretchr/objx/accessors.go
new file mode 100644
index 0000000..6763162
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/accessors.go
@@ -0,0 +1,119 @@
+package objx
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+const (
+	// PathSeparator is the character used to separate the elements
+	// of the keypath.
+	//
+	// For example, `location.address.city`
+	PathSeparator string = "."
+
+	// arrayAccesRegexString is the regex used to extract the array number
+	// from the access path
+	arrayAccesRegexString = `^(.+)\[([0-9]+)\]$`
+)
+
+// arrayAccesRegex is the compiled arrayAccesRegexString
+var arrayAccesRegex = regexp.MustCompile(arrayAccesRegexString)
+
+// Get gets the value using the specified selector and
+// returns it inside a new Obj object.
+//
+// If it cannot find the value, Get will return a nil
+// value inside an instance of Obj.
+//
+// Get can only operate directly on map[string]interface{} and []interface.
+//
+// Example
+//
+// To access the title of the third chapter of the second book, do:
+//
+//    o.Get("books[1].chapters[2].title")
+func (m Map) Get(selector string) *Value {
+	rawObj := access(m, selector, nil, false)
+	return &Value{data: rawObj}
+}
+
+// Set sets the value using the specified selector and
+// returns the object on which Set was called.
+//
+// Set can only operate directly on map[string]interface{} and []interface
+//
+// Example
+//
+// To set the title of the third chapter of the second book, do:
+//
+//    o.Set("books[1].chapters[2].title","Time to Go")
+func (m Map) Set(selector string, value interface{}) Map {
+	access(m, selector, value, true)
+	return m
+}
+
+// getIndex returns the index, which is hold in s by two braches.
+// It also returns s withour the index part, e.g. name[1] will return (1, name).
+// If no index is found, -1 is returned
+func getIndex(s string) (int, string) {
+	arrayMatches := arrayAccesRegex.FindStringSubmatch(s)
+	if len(arrayMatches) > 0 {
+		// Get the key into the map
+		selector := arrayMatches[1]
+		// Get the index into the array at the key
+		// We know this cannt fail because arrayMatches[2] is an int for sure
+		index, _ := strconv.Atoi(arrayMatches[2])
+		return index, selector
+	}
+	return -1, s
+}
+
+// access accesses the object using the selector and performs the
+// appropriate action.
+func access(current interface{}, selector string, value interface{}, isSet bool) interface{} {
+	selSegs := strings.SplitN(selector, PathSeparator, 2)
+	thisSel := selSegs[0]
+	index := -1
+
+	if strings.Contains(thisSel, "[") {
+		index, thisSel = getIndex(thisSel)
+	}
+
+	if curMap, ok := current.(Map); ok {
+		current = map[string]interface{}(curMap)
+	}
+	// get the object in question
+	switch current.(type) {
+	case map[string]interface{}:
+		curMSI := current.(map[string]interface{})
+		if len(selSegs) <= 1 && isSet {
+			curMSI[thisSel] = value
+			return nil
+		}
+
+		_, ok := curMSI[thisSel].(map[string]interface{})
+		if (curMSI[thisSel] == nil || !ok) && index == -1 && isSet {
+			curMSI[thisSel] = map[string]interface{}{}
+		}
+
+		current = curMSI[thisSel]
+	default:
+		current = nil
+	}
+	// do we need to access the item of an array?
+	if index > -1 {
+		if array, ok := current.([]interface{}); ok {
+			if index < len(array) {
+				current = array[index]
+			} else {
+				current = nil
+			}
+		}
+	}
+	if len(selSegs) > 1 {
+		current = access(current, selSegs[1], value, isSet)
+	}
+	return current
+}
diff --git a/go/vendor/github.com/stretchr/objx/conversions.go b/go/vendor/github.com/stretchr/objx/conversions.go
new file mode 100644
index 0000000..8b912e9
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/conversions.go
@@ -0,0 +1,218 @@
+package objx
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"net/url"
+	"strconv"
+)
+
+// SignatureSeparator is the character that is used to
+// separate the Base64 string from the security signature.
+const SignatureSeparator = "_"
+
+// URLValuesSliceKeySuffix is the character that is used to
+// specify a suffic for slices parsed by URLValues.
+// If the suffix is set to "[i]", then the index of the slice
+// is used in place of i
+// Ex: Suffix "[]" would have the form a[]=b&a[]=c
+// OR Suffix "[i]" would have the form a[0]=b&a[1]=c
+// OR Suffix "" would have the form a=b&a=c
+var urlValuesSliceKeySuffix = "[]"
+
+const (
+	URLValuesSliceKeySuffixEmpty = ""
+	URLValuesSliceKeySuffixArray = "[]"
+	URLValuesSliceKeySuffixIndex = "[i]"
+)
+
+// SetURLValuesSliceKeySuffix sets the character that is used to
+// specify a suffic for slices parsed by URLValues.
+// If the suffix is set to "[i]", then the index of the slice
+// is used in place of i
+// Ex: Suffix "[]" would have the form a[]=b&a[]=c
+// OR Suffix "[i]" would have the form a[0]=b&a[1]=c
+// OR Suffix "" would have the form a=b&a=c
+func SetURLValuesSliceKeySuffix(s string) error {
+	if s == URLValuesSliceKeySuffixEmpty || s == URLValuesSliceKeySuffixArray || s == URLValuesSliceKeySuffixIndex {
+		urlValuesSliceKeySuffix = s
+		return nil
+	}
+
+	return errors.New("objx: Invalid URLValuesSliceKeySuffix provided.")
+}
+
+// JSON converts the contained object to a JSON string
+// representation
+func (m Map) JSON() (string, error) {
+	result, err := json.Marshal(m)
+	if err != nil {
+		err = errors.New("objx: JSON encode failed with: " + err.Error())
+	}
+	return string(result), err
+}
+
+// MustJSON converts the contained object to a JSON string
+// representation and panics if there is an error
+func (m Map) MustJSON() string {
+	result, err := m.JSON()
+	if err != nil {
+		panic(err.Error())
+	}
+	return result
+}
+
+// Base64 converts the contained object to a Base64 string
+// representation of the JSON string representation
+func (m Map) Base64() (string, error) {
+	var buf bytes.Buffer
+
+	jsonData, err := m.JSON()
+	if err != nil {
+		return "", err
+	}
+
+	encoder := base64.NewEncoder(base64.StdEncoding, &buf)
+	_, _ = encoder.Write([]byte(jsonData))
+	_ = encoder.Close()
+
+	return buf.String(), nil
+}
+
+// MustBase64 converts the contained object to a Base64 string
+// representation of the JSON string representation and panics
+// if there is an error
+func (m Map) MustBase64() string {
+	result, err := m.Base64()
+	if err != nil {
+		panic(err.Error())
+	}
+	return result
+}
+
+// SignedBase64 converts the contained object to a Base64 string
+// representation of the JSON string representation and signs it
+// using the provided key.
+func (m Map) SignedBase64(key string) (string, error) {
+	base64, err := m.Base64()
+	if err != nil {
+		return "", err
+	}
+
+	sig := HashWithKey(base64, key)
+	return base64 + SignatureSeparator + sig, nil
+}
+
+// MustSignedBase64 converts the contained object to a Base64 string
+// representation of the JSON string representation and signs it
+// using the provided key and panics if there is an error
+func (m Map) MustSignedBase64(key string) string {
+	result, err := m.SignedBase64(key)
+	if err != nil {
+		panic(err.Error())
+	}
+	return result
+}
+
+/*
+	URL Query
+	------------------------------------------------
+*/
+
+// URLValues creates a url.Values object from an Obj. This
+// function requires that the wrapped object be a map[string]interface{}
+func (m Map) URLValues() url.Values {
+	vals := make(url.Values)
+
+	m.parseURLValues(m, vals, "")
+
+	return vals
+}
+
+func (m Map) parseURLValues(queryMap Map, vals url.Values, key string) {
+	useSliceIndex := false
+	if urlValuesSliceKeySuffix == "[i]" {
+		useSliceIndex = true
+	}
+
+	for k, v := range queryMap {
+		val := &Value{data: v}
+		switch {
+		case val.IsObjxMap():
+			if key == "" {
+				m.parseURLValues(val.ObjxMap(), vals, k)
+			} else {
+				m.parseURLValues(val.ObjxMap(), vals, key+"["+k+"]")
+			}
+		case val.IsObjxMapSlice():
+			sliceKey := k
+			if key != "" {
+				sliceKey = key + "[" + k + "]"
+			}
+
+			if useSliceIndex {
+				for i, sv := range val.MustObjxMapSlice() {
+					sk := sliceKey + "[" + strconv.FormatInt(int64(i), 10) + "]"
+					m.parseURLValues(sv, vals, sk)
+				}
+			} else {
+				sliceKey = sliceKey + urlValuesSliceKeySuffix
+				for _, sv := range val.MustObjxMapSlice() {
+					m.parseURLValues(sv, vals, sliceKey)
+				}
+			}
+		case val.IsMSISlice():
+			sliceKey := k
+			if key != "" {
+				sliceKey = key + "[" + k + "]"
+			}
+
+			if useSliceIndex {
+				for i, sv := range val.MustMSISlice() {
+					sk := sliceKey + "[" + strconv.FormatInt(int64(i), 10) + "]"
+					m.parseURLValues(New(sv), vals, sk)
+				}
+			} else {
+				sliceKey = sliceKey + urlValuesSliceKeySuffix
+				for _, sv := range val.MustMSISlice() {
+					m.parseURLValues(New(sv), vals, sliceKey)
+				}
+			}
+		case val.IsStrSlice(), val.IsBoolSlice(),
+			val.IsFloat32Slice(), val.IsFloat64Slice(),
+			val.IsIntSlice(), val.IsInt8Slice(), val.IsInt16Slice(), val.IsInt32Slice(), val.IsInt64Slice(),
+			val.IsUintSlice(), val.IsUint8Slice(), val.IsUint16Slice(), val.IsUint32Slice(), val.IsUint64Slice():
+
+			sliceKey := k
+			if key != "" {
+				sliceKey = key + "[" + k + "]"
+			}
+
+			if useSliceIndex {
+				for i, sv := range val.StringSlice() {
+					sk := sliceKey + "[" + strconv.FormatInt(int64(i), 10) + "]"
+					vals.Set(sk, sv)
+				}
+			} else {
+				sliceKey = sliceKey + urlValuesSliceKeySuffix
+				vals[sliceKey] = val.StringSlice()
+			}
+
+		default:
+			if key == "" {
+				vals.Set(k, val.String())
+			} else {
+				vals.Set(key+"["+k+"]", val.String())
+			}
+		}
+	}
+}
+
+// URLQuery gets an encoded URL query representing the given
+// Obj. This function requires that the wrapped object be a
+// map[string]interface{}
+func (m Map) URLQuery() (string, error) {
+	return m.URLValues().Encode(), nil
+}
diff --git a/go/vendor/github.com/stretchr/objx/doc.go b/go/vendor/github.com/stretchr/objx/doc.go
new file mode 100644
index 0000000..6d6af1a
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/doc.go
@@ -0,0 +1,66 @@
+/*
+Objx - Go package for dealing with maps, slices, JSON and other data.
+
+Overview
+
+Objx provides the `objx.Map` type, which is a `map[string]interface{}` that exposes
+a powerful `Get` method (among others) that allows you to easily and quickly get
+access to data within the map, without having to worry too much about type assertions,
+missing data, default values etc.
+
+Pattern
+
+Objx uses a preditable pattern to make access data from within `map[string]interface{}` easy.
+Call one of the `objx.` functions to create your `objx.Map` to get going:
+
+    m, err := objx.FromJSON(json)
+
+NOTE: Any methods or functions with the `Must` prefix will panic if something goes wrong,
+the rest will be optimistic and try to figure things out without panicking.
+
+Use `Get` to access the value you're interested in.  You can use dot and array
+notation too:
+
+     m.Get("places[0].latlng")
+
+Once you have sought the `Value` you're interested in, you can use the `Is*` methods to determine its type.
+
+     if m.Get("code").IsStr() { // Your code... }
+
+Or you can just assume the type, and use one of the strong type methods to extract the real value:
+
+   m.Get("code").Int()
+
+If there's no value there (or if it's the wrong type) then a default value will be returned,
+or you can be explicit about the default value.
+
+     Get("code").Int(-1)
+
+If you're dealing with a slice of data as a value, Objx provides many useful methods for iterating,
+manipulating and selecting that data.  You can find out more by exploring the index below.
+
+Reading data
+
+A simple example of how to use Objx:
+
+   // Use MustFromJSON to make an objx.Map from some JSON
+   m := objx.MustFromJSON(`{"name": "Mat", "age": 30}`)
+
+   // Get the details
+   name := m.Get("name").Str()
+   age := m.Get("age").Int()
+
+   // Get their nickname (or use their name if they don't have one)
+   nickname := m.Get("nickname").Str(name)
+
+Ranging
+
+Since `objx.Map` is a `map[string]interface{}` you can treat it as such.
+For example, to `range` the data, do what you would expect:
+
+    m := objx.MustFromJSON(json)
+    for key, value := range m {
+      // Your code...
+    }
+*/
+package objx
diff --git a/go/vendor/github.com/stretchr/objx/map.go b/go/vendor/github.com/stretchr/objx/map.go
new file mode 100644
index 0000000..95149c0
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/map.go
@@ -0,0 +1,228 @@
+package objx
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"net/url"
+	"strings"
+)
+
+// MSIConvertable is an interface that defines methods for converting your
+// custom types to a map[string]interface{} representation.
+type MSIConvertable interface {
+	// MSI gets a map[string]interface{} (msi) representing the
+	// object.
+	MSI() map[string]interface{}
+}
+
+// Map provides extended functionality for working with
+// untyped data, in particular map[string]interface (msi).
+type Map map[string]interface{}
+
+// Value returns the internal value instance
+func (m Map) Value() *Value {
+	return &Value{data: m}
+}
+
+// Nil represents a nil Map.
+var Nil = New(nil)
+
+// New creates a new Map containing the map[string]interface{} in the data argument.
+// If the data argument is not a map[string]interface, New attempts to call the
+// MSI() method on the MSIConvertable interface to create one.
+func New(data interface{}) Map {
+	if _, ok := data.(map[string]interface{}); !ok {
+		if converter, ok := data.(MSIConvertable); ok {
+			data = converter.MSI()
+		} else {
+			return nil
+		}
+	}
+	return Map(data.(map[string]interface{}))
+}
+
+// MSI creates a map[string]interface{} and puts it inside a new Map.
+//
+// The arguments follow a key, value pattern.
+//
+//
+// Returns nil if any key argument is non-string or if there are an odd number of arguments.
+//
+// Example
+//
+// To easily create Maps:
+//
+//     m := objx.MSI("name", "Mat", "age", 29, "subobj", objx.MSI("active", true))
+//
+//     // creates an Map equivalent to
+//     m := objx.Map{"name": "Mat", "age": 29, "subobj": objx.Map{"active": true}}
+func MSI(keyAndValuePairs ...interface{}) Map {
+	newMap := Map{}
+	keyAndValuePairsLen := len(keyAndValuePairs)
+	if keyAndValuePairsLen%2 != 0 {
+		return nil
+	}
+	for i := 0; i < keyAndValuePairsLen; i = i + 2 {
+		key := keyAndValuePairs[i]
+		value := keyAndValuePairs[i+1]
+
+		// make sure the key is a string
+		keyString, keyStringOK := key.(string)
+		if !keyStringOK {
+			return nil
+		}
+		newMap[keyString] = value
+	}
+	return newMap
+}
+
+// ****** Conversion Constructors
+
+// MustFromJSON creates a new Map containing the data specified in the
+// jsonString.
+//
+// Panics if the JSON is invalid.
+func MustFromJSON(jsonString string) Map {
+	o, err := FromJSON(jsonString)
+	if err != nil {
+		panic("objx: MustFromJSON failed with error: " + err.Error())
+	}
+	return o
+}
+
+// FromJSON creates a new Map containing the data specified in the
+// jsonString.
+//
+// Returns an error if the JSON is invalid.
+func FromJSON(jsonString string) (Map, error) {
+	var m Map
+	err := json.Unmarshal([]byte(jsonString), &m)
+	if err != nil {
+		return Nil, err
+	}
+	m.tryConvertFloat64()
+	return m, nil
+}
+
+func (m Map) tryConvertFloat64() {
+	for k, v := range m {
+		switch v.(type) {
+		case float64:
+			f := v.(float64)
+			if float64(int(f)) == f {
+				m[k] = int(f)
+			}
+		case map[string]interface{}:
+			t := New(v)
+			t.tryConvertFloat64()
+			m[k] = t
+		case []interface{}:
+			m[k] = tryConvertFloat64InSlice(v.([]interface{}))
+		}
+	}
+}
+
+func tryConvertFloat64InSlice(s []interface{}) []interface{} {
+	for k, v := range s {
+		switch v.(type) {
+		case float64:
+			f := v.(float64)
+			if float64(int(f)) == f {
+				s[k] = int(f)
+			}
+		case map[string]interface{}:
+			t := New(v)
+			t.tryConvertFloat64()
+			s[k] = t
+		case []interface{}:
+			s[k] = tryConvertFloat64InSlice(v.([]interface{}))
+		}
+	}
+	return s
+}
+
+// FromBase64 creates a new Obj containing the data specified
+// in the Base64 string.
+//
+// The string is an encoded JSON string returned by Base64
+func FromBase64(base64String string) (Map, error) {
+	decoder := base64.NewDecoder(base64.StdEncoding, strings.NewReader(base64String))
+	decoded, err := ioutil.ReadAll(decoder)
+	if err != nil {
+		return nil, err
+	}
+	return FromJSON(string(decoded))
+}
+
+// MustFromBase64 creates a new Obj containing the data specified
+// in the Base64 string and panics if there is an error.
+//
+// The string is an encoded JSON string returned by Base64
+func MustFromBase64(base64String string) Map {
+	result, err := FromBase64(base64String)
+	if err != nil {
+		panic("objx: MustFromBase64 failed with error: " + err.Error())
+	}
+	return result
+}
+
+// FromSignedBase64 creates a new Obj containing the data specified
+// in the Base64 string.
+//
+// The string is an encoded JSON string returned by SignedBase64
+func FromSignedBase64(base64String, key string) (Map, error) {
+	parts := strings.Split(base64String, SignatureSeparator)
+	if len(parts) != 2 {
+		return nil, errors.New("objx: Signed base64 string is malformed")
+	}
+
+	sig := HashWithKey(parts[0], key)
+	if parts[1] != sig {
+		return nil, errors.New("objx: Signature for base64 data does not match")
+	}
+	return FromBase64(parts[0])
+}
+
+// MustFromSignedBase64 creates a new Obj containing the data specified
+// in the Base64 string and panics if there is an error.
+//
+// The string is an encoded JSON string returned by Base64
+func MustFromSignedBase64(base64String, key string) Map {
+	result, err := FromSignedBase64(base64String, key)
+	if err != nil {
+		panic("objx: MustFromSignedBase64 failed with error: " + err.Error())
+	}
+	return result
+}
+
+// FromURLQuery generates a new Obj by parsing the specified
+// query.
+//
+// For queries with multiple values, the first value is selected.
+func FromURLQuery(query string) (Map, error) {
+	vals, err := url.ParseQuery(query)
+	if err != nil {
+		return nil, err
+	}
+	m := Map{}
+	for k, vals := range vals {
+		m[k] = vals[0]
+	}
+	return m, nil
+}
+
+// MustFromURLQuery generates a new Obj by parsing the specified
+// query.
+//
+// For queries with multiple values, the first value is selected.
+//
+// Panics if it encounters an error
+func MustFromURLQuery(query string) Map {
+	o, err := FromURLQuery(query)
+	if err != nil {
+		panic("objx: MustFromURLQuery failed with error: " + err.Error())
+	}
+	return o
+}
diff --git a/go/vendor/github.com/stretchr/objx/mutations.go b/go/vendor/github.com/stretchr/objx/mutations.go
new file mode 100644
index 0000000..c3400a3
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/mutations.go
@@ -0,0 +1,77 @@
+package objx
+
+// Exclude returns a new Map with the keys in the specified []string
+// excluded.
+func (m Map) Exclude(exclude []string) Map {
+	excluded := make(Map)
+	for k, v := range m {
+		if !contains(exclude, k) {
+			excluded[k] = v
+		}
+	}
+	return excluded
+}
+
+// Copy creates a shallow copy of the Obj.
+func (m Map) Copy() Map {
+	copied := Map{}
+	for k, v := range m {
+		copied[k] = v
+	}
+	return copied
+}
+
+// Merge blends the specified map with a copy of this map and returns the result.
+//
+// Keys that appear in both will be selected from the specified map.
+// This method requires that the wrapped object be a map[string]interface{}
+func (m Map) Merge(merge Map) Map {
+	return m.Copy().MergeHere(merge)
+}
+
+// MergeHere blends the specified map with this map and returns the current map.
+//
+// Keys that appear in both will be selected from the specified map. The original map
+// will be modified. This method requires that
+// the wrapped object be a map[string]interface{}
+func (m Map) MergeHere(merge Map) Map {
+	for k, v := range merge {
+		m[k] = v
+	}
+	return m
+}
+
+// Transform builds a new Obj giving the transformer a chance
+// to change the keys and values as it goes. This method requires that
+// the wrapped object be a map[string]interface{}
+func (m Map) Transform(transformer func(key string, value interface{}) (string, interface{})) Map {
+	newMap := Map{}
+	for k, v := range m {
+		modifiedKey, modifiedVal := transformer(k, v)
+		newMap[modifiedKey] = modifiedVal
+	}
+	return newMap
+}
+
+// TransformKeys builds a new map using the specified key mapping.
+//
+// Unspecified keys will be unaltered.
+// This method requires that the wrapped object be a map[string]interface{}
+func (m Map) TransformKeys(mapping map[string]string) Map {
+	return m.Transform(func(key string, value interface{}) (string, interface{}) {
+		if newKey, ok := mapping[key]; ok {
+			return newKey, value
+		}
+		return key, value
+	})
+}
+
+// Checks if a string slice contains a string
+func contains(s []string, e string) bool {
+	for _, a := range s {
+		if a == e {
+			return true
+		}
+	}
+	return false
+}
diff --git a/go/vendor/github.com/stretchr/objx/security.go b/go/vendor/github.com/stretchr/objx/security.go
new file mode 100644
index 0000000..692be8e
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/security.go
@@ -0,0 +1,12 @@
+package objx
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+)
+
+// HashWithKey hashes the specified string using the security key
+func HashWithKey(data, key string) string {
+	d := sha1.Sum([]byte(data + ":" + key))
+	return hex.EncodeToString(d[:])
+}
diff --git a/go/vendor/github.com/stretchr/objx/tests.go b/go/vendor/github.com/stretchr/objx/tests.go
new file mode 100644
index 0000000..d9e0b47
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/tests.go
@@ -0,0 +1,17 @@
+package objx
+
+// Has gets whether there is something at the specified selector
+// or not.
+//
+// If m is nil, Has will always return false.
+func (m Map) Has(selector string) bool {
+	if m == nil {
+		return false
+	}
+	return !m.Get(selector).IsNil()
+}
+
+// IsNil gets whether the data is nil or not.
+func (v *Value) IsNil() bool {
+	return v == nil || v.data == nil
+}
diff --git a/go/vendor/github.com/stretchr/objx/type_specific.go b/go/vendor/github.com/stretchr/objx/type_specific.go
new file mode 100644
index 0000000..f647c9b
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/type_specific.go
@@ -0,0 +1,317 @@
+package objx
+
+/*
+   MSI (map[string]interface{} and []map[string]interface{})
+*/
+
+// MSI gets the value as a map[string]interface{}, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) MSI(optionalDefault ...map[string]interface{}) map[string]interface{} {
+	if s, ok := v.data.(map[string]interface{}); ok {
+		return s
+	}
+	if s, ok := v.data.(Map); ok {
+		return map[string]interface{}(s)
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustMSI gets the value as a map[string]interface{}.
+//
+// Panics if the object is not a map[string]interface{}.
+func (v *Value) MustMSI() map[string]interface{} {
+	if s, ok := v.data.(Map); ok {
+		return map[string]interface{}(s)
+	}
+	return v.data.(map[string]interface{})
+}
+
+// MSISlice gets the value as a []map[string]interface{}, returns the optionalDefault
+// value or nil if the value is not a []map[string]interface{}.
+func (v *Value) MSISlice(optionalDefault ...[]map[string]interface{}) []map[string]interface{} {
+	if s, ok := v.data.([]map[string]interface{}); ok {
+		return s
+	}
+
+	s := v.ObjxMapSlice()
+	if s == nil {
+		if len(optionalDefault) == 1 {
+			return optionalDefault[0]
+		}
+		return nil
+	}
+
+	result := make([]map[string]interface{}, len(s))
+	for i := range s {
+		result[i] = s[i].Value().MSI()
+	}
+	return result
+}
+
+// MustMSISlice gets the value as a []map[string]interface{}.
+//
+// Panics if the object is not a []map[string]interface{}.
+func (v *Value) MustMSISlice() []map[string]interface{} {
+	if s := v.MSISlice(); s != nil {
+		return s
+	}
+
+	return v.data.([]map[string]interface{})
+}
+
+// IsMSI gets whether the object contained is a map[string]interface{} or not.
+func (v *Value) IsMSI() bool {
+	_, ok := v.data.(map[string]interface{})
+	if !ok {
+		_, ok = v.data.(Map)
+	}
+	return ok
+}
+
+// IsMSISlice gets whether the object contained is a []map[string]interface{} or not.
+func (v *Value) IsMSISlice() bool {
+	_, ok := v.data.([]map[string]interface{})
+	if !ok {
+		_, ok = v.data.([]Map)
+	}
+	return ok
+}
+
+// EachMSI calls the specified callback for each object
+// in the []map[string]interface{}.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachMSI(callback func(int, map[string]interface{}) bool) *Value {
+	for index, val := range v.MustMSISlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereMSI uses the specified decider function to select items
+// from the []map[string]interface{}.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereMSI(decider func(int, map[string]interface{}) bool) *Value {
+	var selected []map[string]interface{}
+	v.EachMSI(func(index int, val map[string]interface{}) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupMSI uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]map[string]interface{}.
+func (v *Value) GroupMSI(grouper func(int, map[string]interface{}) string) *Value {
+	groups := make(map[string][]map[string]interface{})
+	v.EachMSI(func(index int, val map[string]interface{}) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]map[string]interface{}, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceMSI uses the specified function to replace each map[string]interface{}s
+// by iterating each item.  The data in the returned result will be a
+// []map[string]interface{} containing the replaced items.
+func (v *Value) ReplaceMSI(replacer func(int, map[string]interface{}) map[string]interface{}) *Value {
+	arr := v.MustMSISlice()
+	replaced := make([]map[string]interface{}, len(arr))
+	v.EachMSI(func(index int, val map[string]interface{}) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectMSI uses the specified collector function to collect a value
+// for each of the map[string]interface{}s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectMSI(collector func(int, map[string]interface{}) interface{}) *Value {
+	arr := v.MustMSISlice()
+	collected := make([]interface{}, len(arr))
+	v.EachMSI(func(index int, val map[string]interface{}) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   ObjxMap ((Map) and [](Map))
+*/
+
+// ObjxMap gets the value as a (Map), returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) ObjxMap(optionalDefault ...(Map)) Map {
+	if s, ok := v.data.((Map)); ok {
+		return s
+	}
+	if s, ok := v.data.(map[string]interface{}); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return New(nil)
+}
+
+// MustObjxMap gets the value as a (Map).
+//
+// Panics if the object is not a (Map).
+func (v *Value) MustObjxMap() Map {
+	if s, ok := v.data.(map[string]interface{}); ok {
+		return s
+	}
+	return v.data.((Map))
+}
+
+// ObjxMapSlice gets the value as a [](Map), returns the optionalDefault
+// value or nil if the value is not a [](Map).
+func (v *Value) ObjxMapSlice(optionalDefault ...[](Map)) [](Map) {
+	if s, ok := v.data.([]Map); ok {
+		return s
+	}
+
+	if s, ok := v.data.([]map[string]interface{}); ok {
+		result := make([]Map, len(s))
+		for i := range s {
+			result[i] = s[i]
+		}
+		return result
+	}
+
+	s, ok := v.data.([]interface{})
+	if !ok {
+		if len(optionalDefault) == 1 {
+			return optionalDefault[0]
+		}
+		return nil
+	}
+
+	result := make([]Map, len(s))
+	for i := range s {
+		switch s[i].(type) {
+		case Map:
+			result[i] = s[i].(Map)
+		case map[string]interface{}:
+			result[i] = New(s[i])
+		default:
+			return nil
+		}
+	}
+	return result
+}
+
+// MustObjxMapSlice gets the value as a [](Map).
+//
+// Panics if the object is not a [](Map).
+func (v *Value) MustObjxMapSlice() [](Map) {
+	if s := v.ObjxMapSlice(); s != nil {
+		return s
+	}
+	return v.data.([](Map))
+}
+
+// IsObjxMap gets whether the object contained is a (Map) or not.
+func (v *Value) IsObjxMap() bool {
+	_, ok := v.data.((Map))
+	if !ok {
+		_, ok = v.data.(map[string]interface{})
+	}
+	return ok
+}
+
+// IsObjxMapSlice gets whether the object contained is a [](Map) or not.
+func (v *Value) IsObjxMapSlice() bool {
+	_, ok := v.data.([](Map))
+	if !ok {
+		_, ok = v.data.([]map[string]interface{})
+	}
+	return ok
+}
+
+// EachObjxMap calls the specified callback for each object
+// in the [](Map).
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachObjxMap(callback func(int, Map) bool) *Value {
+	for index, val := range v.MustObjxMapSlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereObjxMap uses the specified decider function to select items
+// from the [](Map).  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereObjxMap(decider func(int, Map) bool) *Value {
+	var selected [](Map)
+	v.EachObjxMap(func(index int, val Map) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupObjxMap uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][](Map).
+func (v *Value) GroupObjxMap(grouper func(int, Map) string) *Value {
+	groups := make(map[string][](Map))
+	v.EachObjxMap(func(index int, val Map) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([](Map), 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceObjxMap uses the specified function to replace each (Map)s
+// by iterating each item.  The data in the returned result will be a
+// [](Map) containing the replaced items.
+func (v *Value) ReplaceObjxMap(replacer func(int, Map) Map) *Value {
+	arr := v.MustObjxMapSlice()
+	replaced := make([](Map), len(arr))
+	v.EachObjxMap(func(index int, val Map) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectObjxMap uses the specified collector function to collect a value
+// for each of the (Map)s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectObjxMap(collector func(int, Map) interface{}) *Value {
+	arr := v.MustObjxMapSlice()
+	collected := make([]interface{}, len(arr))
+	v.EachObjxMap(func(index int, val Map) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
diff --git a/go/vendor/github.com/stretchr/objx/type_specific_codegen.go b/go/vendor/github.com/stretchr/objx/type_specific_codegen.go
new file mode 100644
index 0000000..9859b40
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/type_specific_codegen.go
@@ -0,0 +1,2251 @@
+package objx
+
+/*
+   Inter (interface{} and []interface{})
+*/
+
+// Inter gets the value as a interface{}, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Inter(optionalDefault ...interface{}) interface{} {
+	if s, ok := v.data.(interface{}); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustInter gets the value as a interface{}.
+//
+// Panics if the object is not a interface{}.
+func (v *Value) MustInter() interface{} {
+	return v.data.(interface{})
+}
+
+// InterSlice gets the value as a []interface{}, returns the optionalDefault
+// value or nil if the value is not a []interface{}.
+func (v *Value) InterSlice(optionalDefault ...[]interface{}) []interface{} {
+	if s, ok := v.data.([]interface{}); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustInterSlice gets the value as a []interface{}.
+//
+// Panics if the object is not a []interface{}.
+func (v *Value) MustInterSlice() []interface{} {
+	return v.data.([]interface{})
+}
+
+// IsInter gets whether the object contained is a interface{} or not.
+func (v *Value) IsInter() bool {
+	_, ok := v.data.(interface{})
+	return ok
+}
+
+// IsInterSlice gets whether the object contained is a []interface{} or not.
+func (v *Value) IsInterSlice() bool {
+	_, ok := v.data.([]interface{})
+	return ok
+}
+
+// EachInter calls the specified callback for each object
+// in the []interface{}.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachInter(callback func(int, interface{}) bool) *Value {
+	for index, val := range v.MustInterSlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereInter uses the specified decider function to select items
+// from the []interface{}.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereInter(decider func(int, interface{}) bool) *Value {
+	var selected []interface{}
+	v.EachInter(func(index int, val interface{}) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupInter uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]interface{}.
+func (v *Value) GroupInter(grouper func(int, interface{}) string) *Value {
+	groups := make(map[string][]interface{})
+	v.EachInter(func(index int, val interface{}) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]interface{}, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceInter uses the specified function to replace each interface{}s
+// by iterating each item.  The data in the returned result will be a
+// []interface{} containing the replaced items.
+func (v *Value) ReplaceInter(replacer func(int, interface{}) interface{}) *Value {
+	arr := v.MustInterSlice()
+	replaced := make([]interface{}, len(arr))
+	v.EachInter(func(index int, val interface{}) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectInter uses the specified collector function to collect a value
+// for each of the interface{}s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectInter(collector func(int, interface{}) interface{}) *Value {
+	arr := v.MustInterSlice()
+	collected := make([]interface{}, len(arr))
+	v.EachInter(func(index int, val interface{}) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Bool (bool and []bool)
+*/
+
+// Bool gets the value as a bool, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Bool(optionalDefault ...bool) bool {
+	if s, ok := v.data.(bool); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return false
+}
+
+// MustBool gets the value as a bool.
+//
+// Panics if the object is not a bool.
+func (v *Value) MustBool() bool {
+	return v.data.(bool)
+}
+
+// BoolSlice gets the value as a []bool, returns the optionalDefault
+// value or nil if the value is not a []bool.
+func (v *Value) BoolSlice(optionalDefault ...[]bool) []bool {
+	if s, ok := v.data.([]bool); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustBoolSlice gets the value as a []bool.
+//
+// Panics if the object is not a []bool.
+func (v *Value) MustBoolSlice() []bool {
+	return v.data.([]bool)
+}
+
+// IsBool gets whether the object contained is a bool or not.
+func (v *Value) IsBool() bool {
+	_, ok := v.data.(bool)
+	return ok
+}
+
+// IsBoolSlice gets whether the object contained is a []bool or not.
+func (v *Value) IsBoolSlice() bool {
+	_, ok := v.data.([]bool)
+	return ok
+}
+
+// EachBool calls the specified callback for each object
+// in the []bool.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachBool(callback func(int, bool) bool) *Value {
+	for index, val := range v.MustBoolSlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereBool uses the specified decider function to select items
+// from the []bool.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereBool(decider func(int, bool) bool) *Value {
+	var selected []bool
+	v.EachBool(func(index int, val bool) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupBool uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]bool.
+func (v *Value) GroupBool(grouper func(int, bool) string) *Value {
+	groups := make(map[string][]bool)
+	v.EachBool(func(index int, val bool) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]bool, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceBool uses the specified function to replace each bools
+// by iterating each item.  The data in the returned result will be a
+// []bool containing the replaced items.
+func (v *Value) ReplaceBool(replacer func(int, bool) bool) *Value {
+	arr := v.MustBoolSlice()
+	replaced := make([]bool, len(arr))
+	v.EachBool(func(index int, val bool) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectBool uses the specified collector function to collect a value
+// for each of the bools in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectBool(collector func(int, bool) interface{}) *Value {
+	arr := v.MustBoolSlice()
+	collected := make([]interface{}, len(arr))
+	v.EachBool(func(index int, val bool) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Str (string and []string)
+*/
+
+// Str gets the value as a string, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Str(optionalDefault ...string) string {
+	if s, ok := v.data.(string); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return ""
+}
+
+// MustStr gets the value as a string.
+//
+// Panics if the object is not a string.
+func (v *Value) MustStr() string {
+	return v.data.(string)
+}
+
+// StrSlice gets the value as a []string, returns the optionalDefault
+// value or nil if the value is not a []string.
+func (v *Value) StrSlice(optionalDefault ...[]string) []string {
+	if s, ok := v.data.([]string); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustStrSlice gets the value as a []string.
+//
+// Panics if the object is not a []string.
+func (v *Value) MustStrSlice() []string {
+	return v.data.([]string)
+}
+
+// IsStr gets whether the object contained is a string or not.
+func (v *Value) IsStr() bool {
+	_, ok := v.data.(string)
+	return ok
+}
+
+// IsStrSlice gets whether the object contained is a []string or not.
+func (v *Value) IsStrSlice() bool {
+	_, ok := v.data.([]string)
+	return ok
+}
+
+// EachStr calls the specified callback for each object
+// in the []string.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachStr(callback func(int, string) bool) *Value {
+	for index, val := range v.MustStrSlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereStr uses the specified decider function to select items
+// from the []string.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereStr(decider func(int, string) bool) *Value {
+	var selected []string
+	v.EachStr(func(index int, val string) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupStr uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]string.
+func (v *Value) GroupStr(grouper func(int, string) string) *Value {
+	groups := make(map[string][]string)
+	v.EachStr(func(index int, val string) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]string, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceStr uses the specified function to replace each strings
+// by iterating each item.  The data in the returned result will be a
+// []string containing the replaced items.
+func (v *Value) ReplaceStr(replacer func(int, string) string) *Value {
+	arr := v.MustStrSlice()
+	replaced := make([]string, len(arr))
+	v.EachStr(func(index int, val string) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectStr uses the specified collector function to collect a value
+// for each of the strings in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectStr(collector func(int, string) interface{}) *Value {
+	arr := v.MustStrSlice()
+	collected := make([]interface{}, len(arr))
+	v.EachStr(func(index int, val string) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Int (int and []int)
+*/
+
+// Int gets the value as a int, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Int(optionalDefault ...int) int {
+	if s, ok := v.data.(int); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustInt gets the value as a int.
+//
+// Panics if the object is not a int.
+func (v *Value) MustInt() int {
+	return v.data.(int)
+}
+
+// IntSlice gets the value as a []int, returns the optionalDefault
+// value or nil if the value is not a []int.
+func (v *Value) IntSlice(optionalDefault ...[]int) []int {
+	if s, ok := v.data.([]int); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustIntSlice gets the value as a []int.
+//
+// Panics if the object is not a []int.
+func (v *Value) MustIntSlice() []int {
+	return v.data.([]int)
+}
+
+// IsInt gets whether the object contained is a int or not.
+func (v *Value) IsInt() bool {
+	_, ok := v.data.(int)
+	return ok
+}
+
+// IsIntSlice gets whether the object contained is a []int or not.
+func (v *Value) IsIntSlice() bool {
+	_, ok := v.data.([]int)
+	return ok
+}
+
+// EachInt calls the specified callback for each object
+// in the []int.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachInt(callback func(int, int) bool) *Value {
+	for index, val := range v.MustIntSlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereInt uses the specified decider function to select items
+// from the []int.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereInt(decider func(int, int) bool) *Value {
+	var selected []int
+	v.EachInt(func(index int, val int) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupInt uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]int.
+func (v *Value) GroupInt(grouper func(int, int) string) *Value {
+	groups := make(map[string][]int)
+	v.EachInt(func(index int, val int) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]int, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceInt uses the specified function to replace each ints
+// by iterating each item.  The data in the returned result will be a
+// []int containing the replaced items.
+func (v *Value) ReplaceInt(replacer func(int, int) int) *Value {
+	arr := v.MustIntSlice()
+	replaced := make([]int, len(arr))
+	v.EachInt(func(index int, val int) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectInt uses the specified collector function to collect a value
+// for each of the ints in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectInt(collector func(int, int) interface{}) *Value {
+	arr := v.MustIntSlice()
+	collected := make([]interface{}, len(arr))
+	v.EachInt(func(index int, val int) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Int8 (int8 and []int8)
+*/
+
+// Int8 gets the value as a int8, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Int8(optionalDefault ...int8) int8 {
+	if s, ok := v.data.(int8); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustInt8 gets the value as a int8.
+//
+// Panics if the object is not a int8.
+func (v *Value) MustInt8() int8 {
+	return v.data.(int8)
+}
+
+// Int8Slice gets the value as a []int8, returns the optionalDefault
+// value or nil if the value is not a []int8.
+func (v *Value) Int8Slice(optionalDefault ...[]int8) []int8 {
+	if s, ok := v.data.([]int8); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustInt8Slice gets the value as a []int8.
+//
+// Panics if the object is not a []int8.
+func (v *Value) MustInt8Slice() []int8 {
+	return v.data.([]int8)
+}
+
+// IsInt8 gets whether the object contained is a int8 or not.
+func (v *Value) IsInt8() bool {
+	_, ok := v.data.(int8)
+	return ok
+}
+
+// IsInt8Slice gets whether the object contained is a []int8 or not.
+func (v *Value) IsInt8Slice() bool {
+	_, ok := v.data.([]int8)
+	return ok
+}
+
+// EachInt8 calls the specified callback for each object
+// in the []int8.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachInt8(callback func(int, int8) bool) *Value {
+	for index, val := range v.MustInt8Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereInt8 uses the specified decider function to select items
+// from the []int8.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereInt8(decider func(int, int8) bool) *Value {
+	var selected []int8
+	v.EachInt8(func(index int, val int8) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupInt8 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]int8.
+func (v *Value) GroupInt8(grouper func(int, int8) string) *Value {
+	groups := make(map[string][]int8)
+	v.EachInt8(func(index int, val int8) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]int8, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceInt8 uses the specified function to replace each int8s
+// by iterating each item.  The data in the returned result will be a
+// []int8 containing the replaced items.
+func (v *Value) ReplaceInt8(replacer func(int, int8) int8) *Value {
+	arr := v.MustInt8Slice()
+	replaced := make([]int8, len(arr))
+	v.EachInt8(func(index int, val int8) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectInt8 uses the specified collector function to collect a value
+// for each of the int8s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectInt8(collector func(int, int8) interface{}) *Value {
+	arr := v.MustInt8Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachInt8(func(index int, val int8) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Int16 (int16 and []int16)
+*/
+
+// Int16 gets the value as a int16, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Int16(optionalDefault ...int16) int16 {
+	if s, ok := v.data.(int16); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustInt16 gets the value as a int16.
+//
+// Panics if the object is not a int16.
+func (v *Value) MustInt16() int16 {
+	return v.data.(int16)
+}
+
+// Int16Slice gets the value as a []int16, returns the optionalDefault
+// value or nil if the value is not a []int16.
+func (v *Value) Int16Slice(optionalDefault ...[]int16) []int16 {
+	if s, ok := v.data.([]int16); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustInt16Slice gets the value as a []int16.
+//
+// Panics if the object is not a []int16.
+func (v *Value) MustInt16Slice() []int16 {
+	return v.data.([]int16)
+}
+
+// IsInt16 gets whether the object contained is a int16 or not.
+func (v *Value) IsInt16() bool {
+	_, ok := v.data.(int16)
+	return ok
+}
+
+// IsInt16Slice gets whether the object contained is a []int16 or not.
+func (v *Value) IsInt16Slice() bool {
+	_, ok := v.data.([]int16)
+	return ok
+}
+
+// EachInt16 calls the specified callback for each object
+// in the []int16.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachInt16(callback func(int, int16) bool) *Value {
+	for index, val := range v.MustInt16Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereInt16 uses the specified decider function to select items
+// from the []int16.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereInt16(decider func(int, int16) bool) *Value {
+	var selected []int16
+	v.EachInt16(func(index int, val int16) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupInt16 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]int16.
+func (v *Value) GroupInt16(grouper func(int, int16) string) *Value {
+	groups := make(map[string][]int16)
+	v.EachInt16(func(index int, val int16) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]int16, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceInt16 uses the specified function to replace each int16s
+// by iterating each item.  The data in the returned result will be a
+// []int16 containing the replaced items.
+func (v *Value) ReplaceInt16(replacer func(int, int16) int16) *Value {
+	arr := v.MustInt16Slice()
+	replaced := make([]int16, len(arr))
+	v.EachInt16(func(index int, val int16) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectInt16 uses the specified collector function to collect a value
+// for each of the int16s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectInt16(collector func(int, int16) interface{}) *Value {
+	arr := v.MustInt16Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachInt16(func(index int, val int16) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Int32 (int32 and []int32)
+*/
+
+// Int32 gets the value as a int32, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Int32(optionalDefault ...int32) int32 {
+	if s, ok := v.data.(int32); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustInt32 gets the value as a int32.
+//
+// Panics if the object is not a int32.
+func (v *Value) MustInt32() int32 {
+	return v.data.(int32)
+}
+
+// Int32Slice gets the value as a []int32, returns the optionalDefault
+// value or nil if the value is not a []int32.
+func (v *Value) Int32Slice(optionalDefault ...[]int32) []int32 {
+	if s, ok := v.data.([]int32); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustInt32Slice gets the value as a []int32.
+//
+// Panics if the object is not a []int32.
+func (v *Value) MustInt32Slice() []int32 {
+	return v.data.([]int32)
+}
+
+// IsInt32 gets whether the object contained is a int32 or not.
+func (v *Value) IsInt32() bool {
+	_, ok := v.data.(int32)
+	return ok
+}
+
+// IsInt32Slice gets whether the object contained is a []int32 or not.
+func (v *Value) IsInt32Slice() bool {
+	_, ok := v.data.([]int32)
+	return ok
+}
+
+// EachInt32 calls the specified callback for each object
+// in the []int32.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachInt32(callback func(int, int32) bool) *Value {
+	for index, val := range v.MustInt32Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereInt32 uses the specified decider function to select items
+// from the []int32.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereInt32(decider func(int, int32) bool) *Value {
+	var selected []int32
+	v.EachInt32(func(index int, val int32) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupInt32 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]int32.
+func (v *Value) GroupInt32(grouper func(int, int32) string) *Value {
+	groups := make(map[string][]int32)
+	v.EachInt32(func(index int, val int32) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]int32, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceInt32 uses the specified function to replace each int32s
+// by iterating each item.  The data in the returned result will be a
+// []int32 containing the replaced items.
+func (v *Value) ReplaceInt32(replacer func(int, int32) int32) *Value {
+	arr := v.MustInt32Slice()
+	replaced := make([]int32, len(arr))
+	v.EachInt32(func(index int, val int32) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectInt32 uses the specified collector function to collect a value
+// for each of the int32s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectInt32(collector func(int, int32) interface{}) *Value {
+	arr := v.MustInt32Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachInt32(func(index int, val int32) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Int64 (int64 and []int64)
+*/
+
+// Int64 gets the value as a int64, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Int64(optionalDefault ...int64) int64 {
+	if s, ok := v.data.(int64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustInt64 gets the value as a int64.
+//
+// Panics if the object is not a int64.
+func (v *Value) MustInt64() int64 {
+	return v.data.(int64)
+}
+
+// Int64Slice gets the value as a []int64, returns the optionalDefault
+// value or nil if the value is not a []int64.
+func (v *Value) Int64Slice(optionalDefault ...[]int64) []int64 {
+	if s, ok := v.data.([]int64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustInt64Slice gets the value as a []int64.
+//
+// Panics if the object is not a []int64.
+func (v *Value) MustInt64Slice() []int64 {
+	return v.data.([]int64)
+}
+
+// IsInt64 gets whether the object contained is a int64 or not.
+func (v *Value) IsInt64() bool {
+	_, ok := v.data.(int64)
+	return ok
+}
+
+// IsInt64Slice gets whether the object contained is a []int64 or not.
+func (v *Value) IsInt64Slice() bool {
+	_, ok := v.data.([]int64)
+	return ok
+}
+
+// EachInt64 calls the specified callback for each object
+// in the []int64.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachInt64(callback func(int, int64) bool) *Value {
+	for index, val := range v.MustInt64Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereInt64 uses the specified decider function to select items
+// from the []int64.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereInt64(decider func(int, int64) bool) *Value {
+	var selected []int64
+	v.EachInt64(func(index int, val int64) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupInt64 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]int64.
+func (v *Value) GroupInt64(grouper func(int, int64) string) *Value {
+	groups := make(map[string][]int64)
+	v.EachInt64(func(index int, val int64) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]int64, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceInt64 uses the specified function to replace each int64s
+// by iterating each item.  The data in the returned result will be a
+// []int64 containing the replaced items.
+func (v *Value) ReplaceInt64(replacer func(int, int64) int64) *Value {
+	arr := v.MustInt64Slice()
+	replaced := make([]int64, len(arr))
+	v.EachInt64(func(index int, val int64) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectInt64 uses the specified collector function to collect a value
+// for each of the int64s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectInt64(collector func(int, int64) interface{}) *Value {
+	arr := v.MustInt64Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachInt64(func(index int, val int64) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Uint (uint and []uint)
+*/
+
+// Uint gets the value as a uint, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Uint(optionalDefault ...uint) uint {
+	if s, ok := v.data.(uint); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustUint gets the value as a uint.
+//
+// Panics if the object is not a uint.
+func (v *Value) MustUint() uint {
+	return v.data.(uint)
+}
+
+// UintSlice gets the value as a []uint, returns the optionalDefault
+// value or nil if the value is not a []uint.
+func (v *Value) UintSlice(optionalDefault ...[]uint) []uint {
+	if s, ok := v.data.([]uint); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustUintSlice gets the value as a []uint.
+//
+// Panics if the object is not a []uint.
+func (v *Value) MustUintSlice() []uint {
+	return v.data.([]uint)
+}
+
+// IsUint gets whether the object contained is a uint or not.
+func (v *Value) IsUint() bool {
+	_, ok := v.data.(uint)
+	return ok
+}
+
+// IsUintSlice gets whether the object contained is a []uint or not.
+func (v *Value) IsUintSlice() bool {
+	_, ok := v.data.([]uint)
+	return ok
+}
+
+// EachUint calls the specified callback for each object
+// in the []uint.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachUint(callback func(int, uint) bool) *Value {
+	for index, val := range v.MustUintSlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereUint uses the specified decider function to select items
+// from the []uint.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereUint(decider func(int, uint) bool) *Value {
+	var selected []uint
+	v.EachUint(func(index int, val uint) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupUint uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]uint.
+func (v *Value) GroupUint(grouper func(int, uint) string) *Value {
+	groups := make(map[string][]uint)
+	v.EachUint(func(index int, val uint) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]uint, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceUint uses the specified function to replace each uints
+// by iterating each item.  The data in the returned result will be a
+// []uint containing the replaced items.
+func (v *Value) ReplaceUint(replacer func(int, uint) uint) *Value {
+	arr := v.MustUintSlice()
+	replaced := make([]uint, len(arr))
+	v.EachUint(func(index int, val uint) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectUint uses the specified collector function to collect a value
+// for each of the uints in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectUint(collector func(int, uint) interface{}) *Value {
+	arr := v.MustUintSlice()
+	collected := make([]interface{}, len(arr))
+	v.EachUint(func(index int, val uint) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Uint8 (uint8 and []uint8)
+*/
+
+// Uint8 gets the value as a uint8, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Uint8(optionalDefault ...uint8) uint8 {
+	if s, ok := v.data.(uint8); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustUint8 gets the value as a uint8.
+//
+// Panics if the object is not a uint8.
+func (v *Value) MustUint8() uint8 {
+	return v.data.(uint8)
+}
+
+// Uint8Slice gets the value as a []uint8, returns the optionalDefault
+// value or nil if the value is not a []uint8.
+func (v *Value) Uint8Slice(optionalDefault ...[]uint8) []uint8 {
+	if s, ok := v.data.([]uint8); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustUint8Slice gets the value as a []uint8.
+//
+// Panics if the object is not a []uint8.
+func (v *Value) MustUint8Slice() []uint8 {
+	return v.data.([]uint8)
+}
+
+// IsUint8 gets whether the object contained is a uint8 or not.
+func (v *Value) IsUint8() bool {
+	_, ok := v.data.(uint8)
+	return ok
+}
+
+// IsUint8Slice gets whether the object contained is a []uint8 or not.
+func (v *Value) IsUint8Slice() bool {
+	_, ok := v.data.([]uint8)
+	return ok
+}
+
+// EachUint8 calls the specified callback for each object
+// in the []uint8.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachUint8(callback func(int, uint8) bool) *Value {
+	for index, val := range v.MustUint8Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereUint8 uses the specified decider function to select items
+// from the []uint8.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereUint8(decider func(int, uint8) bool) *Value {
+	var selected []uint8
+	v.EachUint8(func(index int, val uint8) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupUint8 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]uint8.
+func (v *Value) GroupUint8(grouper func(int, uint8) string) *Value {
+	groups := make(map[string][]uint8)
+	v.EachUint8(func(index int, val uint8) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]uint8, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceUint8 uses the specified function to replace each uint8s
+// by iterating each item.  The data in the returned result will be a
+// []uint8 containing the replaced items.
+func (v *Value) ReplaceUint8(replacer func(int, uint8) uint8) *Value {
+	arr := v.MustUint8Slice()
+	replaced := make([]uint8, len(arr))
+	v.EachUint8(func(index int, val uint8) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectUint8 uses the specified collector function to collect a value
+// for each of the uint8s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectUint8(collector func(int, uint8) interface{}) *Value {
+	arr := v.MustUint8Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachUint8(func(index int, val uint8) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Uint16 (uint16 and []uint16)
+*/
+
+// Uint16 gets the value as a uint16, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Uint16(optionalDefault ...uint16) uint16 {
+	if s, ok := v.data.(uint16); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustUint16 gets the value as a uint16.
+//
+// Panics if the object is not a uint16.
+func (v *Value) MustUint16() uint16 {
+	return v.data.(uint16)
+}
+
+// Uint16Slice gets the value as a []uint16, returns the optionalDefault
+// value or nil if the value is not a []uint16.
+func (v *Value) Uint16Slice(optionalDefault ...[]uint16) []uint16 {
+	if s, ok := v.data.([]uint16); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustUint16Slice gets the value as a []uint16.
+//
+// Panics if the object is not a []uint16.
+func (v *Value) MustUint16Slice() []uint16 {
+	return v.data.([]uint16)
+}
+
+// IsUint16 gets whether the object contained is a uint16 or not.
+func (v *Value) IsUint16() bool {
+	_, ok := v.data.(uint16)
+	return ok
+}
+
+// IsUint16Slice gets whether the object contained is a []uint16 or not.
+func (v *Value) IsUint16Slice() bool {
+	_, ok := v.data.([]uint16)
+	return ok
+}
+
+// EachUint16 calls the specified callback for each object
+// in the []uint16.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachUint16(callback func(int, uint16) bool) *Value {
+	for index, val := range v.MustUint16Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereUint16 uses the specified decider function to select items
+// from the []uint16.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereUint16(decider func(int, uint16) bool) *Value {
+	var selected []uint16
+	v.EachUint16(func(index int, val uint16) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupUint16 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]uint16.
+func (v *Value) GroupUint16(grouper func(int, uint16) string) *Value {
+	groups := make(map[string][]uint16)
+	v.EachUint16(func(index int, val uint16) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]uint16, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceUint16 uses the specified function to replace each uint16s
+// by iterating each item.  The data in the returned result will be a
+// []uint16 containing the replaced items.
+func (v *Value) ReplaceUint16(replacer func(int, uint16) uint16) *Value {
+	arr := v.MustUint16Slice()
+	replaced := make([]uint16, len(arr))
+	v.EachUint16(func(index int, val uint16) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectUint16 uses the specified collector function to collect a value
+// for each of the uint16s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectUint16(collector func(int, uint16) interface{}) *Value {
+	arr := v.MustUint16Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachUint16(func(index int, val uint16) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Uint32 (uint32 and []uint32)
+*/
+
+// Uint32 gets the value as a uint32, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Uint32(optionalDefault ...uint32) uint32 {
+	if s, ok := v.data.(uint32); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustUint32 gets the value as a uint32.
+//
+// Panics if the object is not a uint32.
+func (v *Value) MustUint32() uint32 {
+	return v.data.(uint32)
+}
+
+// Uint32Slice gets the value as a []uint32, returns the optionalDefault
+// value or nil if the value is not a []uint32.
+func (v *Value) Uint32Slice(optionalDefault ...[]uint32) []uint32 {
+	if s, ok := v.data.([]uint32); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustUint32Slice gets the value as a []uint32.
+//
+// Panics if the object is not a []uint32.
+func (v *Value) MustUint32Slice() []uint32 {
+	return v.data.([]uint32)
+}
+
+// IsUint32 gets whether the object contained is a uint32 or not.
+func (v *Value) IsUint32() bool {
+	_, ok := v.data.(uint32)
+	return ok
+}
+
+// IsUint32Slice gets whether the object contained is a []uint32 or not.
+func (v *Value) IsUint32Slice() bool {
+	_, ok := v.data.([]uint32)
+	return ok
+}
+
+// EachUint32 calls the specified callback for each object
+// in the []uint32.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachUint32(callback func(int, uint32) bool) *Value {
+	for index, val := range v.MustUint32Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereUint32 uses the specified decider function to select items
+// from the []uint32.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereUint32(decider func(int, uint32) bool) *Value {
+	var selected []uint32
+	v.EachUint32(func(index int, val uint32) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupUint32 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]uint32.
+func (v *Value) GroupUint32(grouper func(int, uint32) string) *Value {
+	groups := make(map[string][]uint32)
+	v.EachUint32(func(index int, val uint32) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]uint32, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceUint32 uses the specified function to replace each uint32s
+// by iterating each item.  The data in the returned result will be a
+// []uint32 containing the replaced items.
+func (v *Value) ReplaceUint32(replacer func(int, uint32) uint32) *Value {
+	arr := v.MustUint32Slice()
+	replaced := make([]uint32, len(arr))
+	v.EachUint32(func(index int, val uint32) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectUint32 uses the specified collector function to collect a value
+// for each of the uint32s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectUint32(collector func(int, uint32) interface{}) *Value {
+	arr := v.MustUint32Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachUint32(func(index int, val uint32) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Uint64 (uint64 and []uint64)
+*/
+
+// Uint64 gets the value as a uint64, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Uint64(optionalDefault ...uint64) uint64 {
+	if s, ok := v.data.(uint64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustUint64 gets the value as a uint64.
+//
+// Panics if the object is not a uint64.
+func (v *Value) MustUint64() uint64 {
+	return v.data.(uint64)
+}
+
+// Uint64Slice gets the value as a []uint64, returns the optionalDefault
+// value or nil if the value is not a []uint64.
+func (v *Value) Uint64Slice(optionalDefault ...[]uint64) []uint64 {
+	if s, ok := v.data.([]uint64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustUint64Slice gets the value as a []uint64.
+//
+// Panics if the object is not a []uint64.
+func (v *Value) MustUint64Slice() []uint64 {
+	return v.data.([]uint64)
+}
+
+// IsUint64 gets whether the object contained is a uint64 or not.
+func (v *Value) IsUint64() bool {
+	_, ok := v.data.(uint64)
+	return ok
+}
+
+// IsUint64Slice gets whether the object contained is a []uint64 or not.
+func (v *Value) IsUint64Slice() bool {
+	_, ok := v.data.([]uint64)
+	return ok
+}
+
+// EachUint64 calls the specified callback for each object
+// in the []uint64.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachUint64(callback func(int, uint64) bool) *Value {
+	for index, val := range v.MustUint64Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereUint64 uses the specified decider function to select items
+// from the []uint64.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereUint64(decider func(int, uint64) bool) *Value {
+	var selected []uint64
+	v.EachUint64(func(index int, val uint64) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupUint64 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]uint64.
+func (v *Value) GroupUint64(grouper func(int, uint64) string) *Value {
+	groups := make(map[string][]uint64)
+	v.EachUint64(func(index int, val uint64) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]uint64, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceUint64 uses the specified function to replace each uint64s
+// by iterating each item.  The data in the returned result will be a
+// []uint64 containing the replaced items.
+func (v *Value) ReplaceUint64(replacer func(int, uint64) uint64) *Value {
+	arr := v.MustUint64Slice()
+	replaced := make([]uint64, len(arr))
+	v.EachUint64(func(index int, val uint64) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectUint64 uses the specified collector function to collect a value
+// for each of the uint64s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectUint64(collector func(int, uint64) interface{}) *Value {
+	arr := v.MustUint64Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachUint64(func(index int, val uint64) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Uintptr (uintptr and []uintptr)
+*/
+
+// Uintptr gets the value as a uintptr, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Uintptr(optionalDefault ...uintptr) uintptr {
+	if s, ok := v.data.(uintptr); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustUintptr gets the value as a uintptr.
+//
+// Panics if the object is not a uintptr.
+func (v *Value) MustUintptr() uintptr {
+	return v.data.(uintptr)
+}
+
+// UintptrSlice gets the value as a []uintptr, returns the optionalDefault
+// value or nil if the value is not a []uintptr.
+func (v *Value) UintptrSlice(optionalDefault ...[]uintptr) []uintptr {
+	if s, ok := v.data.([]uintptr); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustUintptrSlice gets the value as a []uintptr.
+//
+// Panics if the object is not a []uintptr.
+func (v *Value) MustUintptrSlice() []uintptr {
+	return v.data.([]uintptr)
+}
+
+// IsUintptr gets whether the object contained is a uintptr or not.
+func (v *Value) IsUintptr() bool {
+	_, ok := v.data.(uintptr)
+	return ok
+}
+
+// IsUintptrSlice gets whether the object contained is a []uintptr or not.
+func (v *Value) IsUintptrSlice() bool {
+	_, ok := v.data.([]uintptr)
+	return ok
+}
+
+// EachUintptr calls the specified callback for each object
+// in the []uintptr.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachUintptr(callback func(int, uintptr) bool) *Value {
+	for index, val := range v.MustUintptrSlice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereUintptr uses the specified decider function to select items
+// from the []uintptr.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereUintptr(decider func(int, uintptr) bool) *Value {
+	var selected []uintptr
+	v.EachUintptr(func(index int, val uintptr) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupUintptr uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]uintptr.
+func (v *Value) GroupUintptr(grouper func(int, uintptr) string) *Value {
+	groups := make(map[string][]uintptr)
+	v.EachUintptr(func(index int, val uintptr) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]uintptr, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceUintptr uses the specified function to replace each uintptrs
+// by iterating each item.  The data in the returned result will be a
+// []uintptr containing the replaced items.
+func (v *Value) ReplaceUintptr(replacer func(int, uintptr) uintptr) *Value {
+	arr := v.MustUintptrSlice()
+	replaced := make([]uintptr, len(arr))
+	v.EachUintptr(func(index int, val uintptr) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectUintptr uses the specified collector function to collect a value
+// for each of the uintptrs in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectUintptr(collector func(int, uintptr) interface{}) *Value {
+	arr := v.MustUintptrSlice()
+	collected := make([]interface{}, len(arr))
+	v.EachUintptr(func(index int, val uintptr) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Float32 (float32 and []float32)
+*/
+
+// Float32 gets the value as a float32, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Float32(optionalDefault ...float32) float32 {
+	if s, ok := v.data.(float32); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustFloat32 gets the value as a float32.
+//
+// Panics if the object is not a float32.
+func (v *Value) MustFloat32() float32 {
+	return v.data.(float32)
+}
+
+// Float32Slice gets the value as a []float32, returns the optionalDefault
+// value or nil if the value is not a []float32.
+func (v *Value) Float32Slice(optionalDefault ...[]float32) []float32 {
+	if s, ok := v.data.([]float32); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustFloat32Slice gets the value as a []float32.
+//
+// Panics if the object is not a []float32.
+func (v *Value) MustFloat32Slice() []float32 {
+	return v.data.([]float32)
+}
+
+// IsFloat32 gets whether the object contained is a float32 or not.
+func (v *Value) IsFloat32() bool {
+	_, ok := v.data.(float32)
+	return ok
+}
+
+// IsFloat32Slice gets whether the object contained is a []float32 or not.
+func (v *Value) IsFloat32Slice() bool {
+	_, ok := v.data.([]float32)
+	return ok
+}
+
+// EachFloat32 calls the specified callback for each object
+// in the []float32.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachFloat32(callback func(int, float32) bool) *Value {
+	for index, val := range v.MustFloat32Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereFloat32 uses the specified decider function to select items
+// from the []float32.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereFloat32(decider func(int, float32) bool) *Value {
+	var selected []float32
+	v.EachFloat32(func(index int, val float32) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupFloat32 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]float32.
+func (v *Value) GroupFloat32(grouper func(int, float32) string) *Value {
+	groups := make(map[string][]float32)
+	v.EachFloat32(func(index int, val float32) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]float32, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceFloat32 uses the specified function to replace each float32s
+// by iterating each item.  The data in the returned result will be a
+// []float32 containing the replaced items.
+func (v *Value) ReplaceFloat32(replacer func(int, float32) float32) *Value {
+	arr := v.MustFloat32Slice()
+	replaced := make([]float32, len(arr))
+	v.EachFloat32(func(index int, val float32) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectFloat32 uses the specified collector function to collect a value
+// for each of the float32s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectFloat32(collector func(int, float32) interface{}) *Value {
+	arr := v.MustFloat32Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachFloat32(func(index int, val float32) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Float64 (float64 and []float64)
+*/
+
+// Float64 gets the value as a float64, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Float64(optionalDefault ...float64) float64 {
+	if s, ok := v.data.(float64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustFloat64 gets the value as a float64.
+//
+// Panics if the object is not a float64.
+func (v *Value) MustFloat64() float64 {
+	return v.data.(float64)
+}
+
+// Float64Slice gets the value as a []float64, returns the optionalDefault
+// value or nil if the value is not a []float64.
+func (v *Value) Float64Slice(optionalDefault ...[]float64) []float64 {
+	if s, ok := v.data.([]float64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustFloat64Slice gets the value as a []float64.
+//
+// Panics if the object is not a []float64.
+func (v *Value) MustFloat64Slice() []float64 {
+	return v.data.([]float64)
+}
+
+// IsFloat64 gets whether the object contained is a float64 or not.
+func (v *Value) IsFloat64() bool {
+	_, ok := v.data.(float64)
+	return ok
+}
+
+// IsFloat64Slice gets whether the object contained is a []float64 or not.
+func (v *Value) IsFloat64Slice() bool {
+	_, ok := v.data.([]float64)
+	return ok
+}
+
+// EachFloat64 calls the specified callback for each object
+// in the []float64.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachFloat64(callback func(int, float64) bool) *Value {
+	for index, val := range v.MustFloat64Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereFloat64 uses the specified decider function to select items
+// from the []float64.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereFloat64(decider func(int, float64) bool) *Value {
+	var selected []float64
+	v.EachFloat64(func(index int, val float64) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupFloat64 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]float64.
+func (v *Value) GroupFloat64(grouper func(int, float64) string) *Value {
+	groups := make(map[string][]float64)
+	v.EachFloat64(func(index int, val float64) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]float64, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceFloat64 uses the specified function to replace each float64s
+// by iterating each item.  The data in the returned result will be a
+// []float64 containing the replaced items.
+func (v *Value) ReplaceFloat64(replacer func(int, float64) float64) *Value {
+	arr := v.MustFloat64Slice()
+	replaced := make([]float64, len(arr))
+	v.EachFloat64(func(index int, val float64) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectFloat64 uses the specified collector function to collect a value
+// for each of the float64s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectFloat64(collector func(int, float64) interface{}) *Value {
+	arr := v.MustFloat64Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachFloat64(func(index int, val float64) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Complex64 (complex64 and []complex64)
+*/
+
+// Complex64 gets the value as a complex64, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Complex64(optionalDefault ...complex64) complex64 {
+	if s, ok := v.data.(complex64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustComplex64 gets the value as a complex64.
+//
+// Panics if the object is not a complex64.
+func (v *Value) MustComplex64() complex64 {
+	return v.data.(complex64)
+}
+
+// Complex64Slice gets the value as a []complex64, returns the optionalDefault
+// value or nil if the value is not a []complex64.
+func (v *Value) Complex64Slice(optionalDefault ...[]complex64) []complex64 {
+	if s, ok := v.data.([]complex64); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustComplex64Slice gets the value as a []complex64.
+//
+// Panics if the object is not a []complex64.
+func (v *Value) MustComplex64Slice() []complex64 {
+	return v.data.([]complex64)
+}
+
+// IsComplex64 gets whether the object contained is a complex64 or not.
+func (v *Value) IsComplex64() bool {
+	_, ok := v.data.(complex64)
+	return ok
+}
+
+// IsComplex64Slice gets whether the object contained is a []complex64 or not.
+func (v *Value) IsComplex64Slice() bool {
+	_, ok := v.data.([]complex64)
+	return ok
+}
+
+// EachComplex64 calls the specified callback for each object
+// in the []complex64.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachComplex64(callback func(int, complex64) bool) *Value {
+	for index, val := range v.MustComplex64Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereComplex64 uses the specified decider function to select items
+// from the []complex64.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereComplex64(decider func(int, complex64) bool) *Value {
+	var selected []complex64
+	v.EachComplex64(func(index int, val complex64) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupComplex64 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]complex64.
+func (v *Value) GroupComplex64(grouper func(int, complex64) string) *Value {
+	groups := make(map[string][]complex64)
+	v.EachComplex64(func(index int, val complex64) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]complex64, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceComplex64 uses the specified function to replace each complex64s
+// by iterating each item.  The data in the returned result will be a
+// []complex64 containing the replaced items.
+func (v *Value) ReplaceComplex64(replacer func(int, complex64) complex64) *Value {
+	arr := v.MustComplex64Slice()
+	replaced := make([]complex64, len(arr))
+	v.EachComplex64(func(index int, val complex64) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectComplex64 uses the specified collector function to collect a value
+// for each of the complex64s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectComplex64(collector func(int, complex64) interface{}) *Value {
+	arr := v.MustComplex64Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachComplex64(func(index int, val complex64) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
+
+/*
+   Complex128 (complex128 and []complex128)
+*/
+
+// Complex128 gets the value as a complex128, returns the optionalDefault
+// value or a system default object if the value is the wrong type.
+func (v *Value) Complex128(optionalDefault ...complex128) complex128 {
+	if s, ok := v.data.(complex128); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return 0
+}
+
+// MustComplex128 gets the value as a complex128.
+//
+// Panics if the object is not a complex128.
+func (v *Value) MustComplex128() complex128 {
+	return v.data.(complex128)
+}
+
+// Complex128Slice gets the value as a []complex128, returns the optionalDefault
+// value or nil if the value is not a []complex128.
+func (v *Value) Complex128Slice(optionalDefault ...[]complex128) []complex128 {
+	if s, ok := v.data.([]complex128); ok {
+		return s
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+	return nil
+}
+
+// MustComplex128Slice gets the value as a []complex128.
+//
+// Panics if the object is not a []complex128.
+func (v *Value) MustComplex128Slice() []complex128 {
+	return v.data.([]complex128)
+}
+
+// IsComplex128 gets whether the object contained is a complex128 or not.
+func (v *Value) IsComplex128() bool {
+	_, ok := v.data.(complex128)
+	return ok
+}
+
+// IsComplex128Slice gets whether the object contained is a []complex128 or not.
+func (v *Value) IsComplex128Slice() bool {
+	_, ok := v.data.([]complex128)
+	return ok
+}
+
+// EachComplex128 calls the specified callback for each object
+// in the []complex128.
+//
+// Panics if the object is the wrong type.
+func (v *Value) EachComplex128(callback func(int, complex128) bool) *Value {
+	for index, val := range v.MustComplex128Slice() {
+		carryon := callback(index, val)
+		if !carryon {
+			break
+		}
+	}
+	return v
+}
+
+// WhereComplex128 uses the specified decider function to select items
+// from the []complex128.  The object contained in the result will contain
+// only the selected items.
+func (v *Value) WhereComplex128(decider func(int, complex128) bool) *Value {
+	var selected []complex128
+	v.EachComplex128(func(index int, val complex128) bool {
+		shouldSelect := decider(index, val)
+		if !shouldSelect {
+			selected = append(selected, val)
+		}
+		return true
+	})
+	return &Value{data: selected}
+}
+
+// GroupComplex128 uses the specified grouper function to group the items
+// keyed by the return of the grouper.  The object contained in the
+// result will contain a map[string][]complex128.
+func (v *Value) GroupComplex128(grouper func(int, complex128) string) *Value {
+	groups := make(map[string][]complex128)
+	v.EachComplex128(func(index int, val complex128) bool {
+		group := grouper(index, val)
+		if _, ok := groups[group]; !ok {
+			groups[group] = make([]complex128, 0)
+		}
+		groups[group] = append(groups[group], val)
+		return true
+	})
+	return &Value{data: groups}
+}
+
+// ReplaceComplex128 uses the specified function to replace each complex128s
+// by iterating each item.  The data in the returned result will be a
+// []complex128 containing the replaced items.
+func (v *Value) ReplaceComplex128(replacer func(int, complex128) complex128) *Value {
+	arr := v.MustComplex128Slice()
+	replaced := make([]complex128, len(arr))
+	v.EachComplex128(func(index int, val complex128) bool {
+		replaced[index] = replacer(index, val)
+		return true
+	})
+	return &Value{data: replaced}
+}
+
+// CollectComplex128 uses the specified collector function to collect a value
+// for each of the complex128s in the slice.  The data returned will be a
+// []interface{}.
+func (v *Value) CollectComplex128(collector func(int, complex128) interface{}) *Value {
+	arr := v.MustComplex128Slice()
+	collected := make([]interface{}, len(arr))
+	v.EachComplex128(func(index int, val complex128) bool {
+		collected[index] = collector(index, val)
+		return true
+	})
+	return &Value{data: collected}
+}
diff --git a/go/vendor/github.com/stretchr/objx/value.go b/go/vendor/github.com/stretchr/objx/value.go
new file mode 100644
index 0000000..4e5f9b7
--- /dev/null
+++ b/go/vendor/github.com/stretchr/objx/value.go
@@ -0,0 +1,159 @@
+package objx
+
+import (
+	"fmt"
+	"strconv"
+)
+
+// Value provides methods for extracting interface{} data in various
+// types.
+type Value struct {
+	// data contains the raw data being managed by this Value
+	data interface{}
+}
+
+// Data returns the raw data contained by this Value
+func (v *Value) Data() interface{} {
+	return v.data
+}
+
+// String returns the value always as a string
+func (v *Value) String() string {
+	switch {
+	case v.IsNil():
+		return ""
+	case v.IsStr():
+		return v.Str()
+	case v.IsBool():
+		return strconv.FormatBool(v.Bool())
+	case v.IsFloat32():
+		return strconv.FormatFloat(float64(v.Float32()), 'f', -1, 32)
+	case v.IsFloat64():
+		return strconv.FormatFloat(v.Float64(), 'f', -1, 64)
+	case v.IsInt():
+		return strconv.FormatInt(int64(v.Int()), 10)
+	case v.IsInt8():
+		return strconv.FormatInt(int64(v.Int8()), 10)
+	case v.IsInt16():
+		return strconv.FormatInt(int64(v.Int16()), 10)
+	case v.IsInt32():
+		return strconv.FormatInt(int64(v.Int32()), 10)
+	case v.IsInt64():
+		return strconv.FormatInt(v.Int64(), 10)
+	case v.IsUint():
+		return strconv.FormatUint(uint64(v.Uint()), 10)
+	case v.IsUint8():
+		return strconv.FormatUint(uint64(v.Uint8()), 10)
+	case v.IsUint16():
+		return strconv.FormatUint(uint64(v.Uint16()), 10)
+	case v.IsUint32():
+		return strconv.FormatUint(uint64(v.Uint32()), 10)
+	case v.IsUint64():
+		return strconv.FormatUint(v.Uint64(), 10)
+	}
+	return fmt.Sprintf("%#v", v.Data())
+}
+
+// StringSlice returns the value always as a []string
+func (v *Value) StringSlice(optionalDefault ...[]string) []string {
+	switch {
+	case v.IsStrSlice():
+		return v.MustStrSlice()
+	case v.IsBoolSlice():
+		slice := v.MustBoolSlice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatBool(iv)
+		}
+		return vals
+	case v.IsFloat32Slice():
+		slice := v.MustFloat32Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatFloat(float64(iv), 'f', -1, 32)
+		}
+		return vals
+	case v.IsFloat64Slice():
+		slice := v.MustFloat64Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatFloat(iv, 'f', -1, 64)
+		}
+		return vals
+	case v.IsIntSlice():
+		slice := v.MustIntSlice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatInt(int64(iv), 10)
+		}
+		return vals
+	case v.IsInt8Slice():
+		slice := v.MustInt8Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatInt(int64(iv), 10)
+		}
+		return vals
+	case v.IsInt16Slice():
+		slice := v.MustInt16Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatInt(int64(iv), 10)
+		}
+		return vals
+	case v.IsInt32Slice():
+		slice := v.MustInt32Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatInt(int64(iv), 10)
+		}
+		return vals
+	case v.IsInt64Slice():
+		slice := v.MustInt64Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatInt(iv, 10)
+		}
+		return vals
+	case v.IsUintSlice():
+		slice := v.MustUintSlice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatUint(uint64(iv), 10)
+		}
+		return vals
+	case v.IsUint8Slice():
+		slice := v.MustUint8Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatUint(uint64(iv), 10)
+		}
+		return vals
+	case v.IsUint16Slice():
+		slice := v.MustUint16Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatUint(uint64(iv), 10)
+		}
+		return vals
+	case v.IsUint32Slice():
+		slice := v.MustUint32Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatUint(uint64(iv), 10)
+		}
+		return vals
+	case v.IsUint64Slice():
+		slice := v.MustUint64Slice()
+		vals := make([]string, len(slice))
+		for i, iv := range slice {
+			vals[i] = strconv.FormatUint(iv, 10)
+		}
+		return vals
+	}
+	if len(optionalDefault) == 1 {
+		return optionalDefault[0]
+	}
+
+	return []string{}
+}
diff --git a/go/vendor/github.com/stretchr/testify/Gopkg.lock b/go/vendor/github.com/stretchr/testify/Gopkg.lock
new file mode 100644
index 0000000..294cda0
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/Gopkg.lock
@@ -0,0 +1,27 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  name = "github.com/davecgh/go-spew"
+  packages = ["spew"]
+  revision = "346938d642f2ec3594ed81d874461961cd0faa76"
+  version = "v1.1.0"
+
+[[projects]]
+  name = "github.com/pmezard/go-difflib"
+  packages = ["difflib"]
+  revision = "792786c7400a136282c1664665ae0a8db921c6c2"
+  version = "v1.0.0"
+
+[[projects]]
+  name = "github.com/stretchr/objx"
+  packages = ["."]
+  revision = "facf9a85c22f48d2f52f2380e4efce1768749a89"
+  version = "v0.1"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "448ddae4702c6aded2555faafd390c537789bb1c483f70b0431e6634f73f2090"
+  solver-name = "gps-cdcl"
+  solver-version = 1
diff --git a/go/vendor/github.com/stretchr/testify/Gopkg.toml b/go/vendor/github.com/stretchr/testify/Gopkg.toml
new file mode 100644
index 0000000..a16374c
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/Gopkg.toml
@@ -0,0 +1,16 @@
+[prune]
+  unused-packages = true
+  non-go = true
+  go-tests = true
+
+[[constraint]]
+  name = "github.com/davecgh/go-spew"
+  version = "~1.1.0"
+
+[[constraint]]
+  name = "github.com/pmezard/go-difflib"
+  version = "~1.0.0"
+
+[[constraint]]
+  name = "github.com/stretchr/objx"
+  version = "~0.1.0"
diff --git a/go/vendor/github.com/stretchr/testify/LICENSE b/go/vendor/github.com/stretchr/testify/LICENSE
new file mode 100644
index 0000000..f38ec59
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2012-2018 Mat Ryer and Tyler Bunnell
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/go/vendor/github.com/stretchr/testify/README.md b/go/vendor/github.com/stretchr/testify/README.md
new file mode 100644
index 0000000..0eb9987
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/README.md
@@ -0,0 +1,338 @@
+Testify - Thou Shalt Write Tests
+================================
+
+[![Build Status](https://travis-ci.org/stretchr/testify.svg)](https://travis-ci.org/stretchr/testify) [![Go Report Card](https://goreportcard.com/badge/github.com/stretchr/testify)](https://goreportcard.com/report/github.com/stretchr/testify) [![GoDoc](https://godoc.org/github.com/stretchr/testify?status.svg)](https://godoc.org/github.com/stretchr/testify)
+
+Go code (golang) set of packages that provide many tools for testifying that your code will behave as you intend.
+
+Features include:
+
+  * [Easy assertions](#assert-package)
+  * [Mocking](#mock-package)
+  * [Testing suite interfaces and functions](#suite-package)
+
+Get started:
+
+  * Install testify with [one line of code](#installation), or [update it with another](#staying-up-to-date)
+  * For an introduction to writing test code in Go, see http://golang.org/doc/code.html#Testing
+  * Check out the API Documentation http://godoc.org/github.com/stretchr/testify
+  * To make your testing life easier, check out our other project, [gorc](http://github.com/stretchr/gorc)
+  * A little about [Test-Driven Development (TDD)](http://en.wikipedia.org/wiki/Test-driven_development)
+
+
+
+[`assert`](http://godoc.org/github.com/stretchr/testify/assert "API documentation") package
+-------------------------------------------------------------------------------------------
+
+The `assert` package provides some helpful methods that allow you to write better test code in Go.
+
+  * Prints friendly, easy to read failure descriptions
+  * Allows for very readable code
+  * Optionally annotate each assertion with a message
+
+See it in action:
+
+```go
+package yours
+
+import (
+  "testing"
+  "github.com/stretchr/testify/assert"
+)
+
+func TestSomething(t *testing.T) {
+
+  // assert equality
+  assert.Equal(t, 123, 123, "they should be equal")
+
+  // assert inequality
+  assert.NotEqual(t, 123, 456, "they should not be equal")
+
+  // assert for nil (good for errors)
+  assert.Nil(t, object)
+
+  // assert for not nil (good when you expect something)
+  if assert.NotNil(t, object) {
+
+    // now we know that object isn't nil, we are safe to make
+    // further assertions without causing any errors
+    assert.Equal(t, "Something", object.Value)
+
+  }
+
+}
+```
+
+  * Every assert func takes the `testing.T` object as the first argument.  This is how it writes the errors out through the normal `go test` capabilities.
+  * Every assert func returns a bool indicating whether the assertion was successful or not, this is useful for if you want to go on making further assertions under certain conditions.
+
+if you assert many times, use the below:
+
+```go
+package yours
+
+import (
+  "testing"
+  "github.com/stretchr/testify/assert"
+)
+
+func TestSomething(t *testing.T) {
+  assert := assert.New(t)
+
+  // assert equality
+  assert.Equal(123, 123, "they should be equal")
+
+  // assert inequality
+  assert.NotEqual(123, 456, "they should not be equal")
+
+  // assert for nil (good for errors)
+  assert.Nil(object)
+
+  // assert for not nil (good when you expect something)
+  if assert.NotNil(object) {
+
+    // now we know that object isn't nil, we are safe to make
+    // further assertions without causing any errors
+    assert.Equal("Something", object.Value)
+  }
+}
+```
+
+[`require`](http://godoc.org/github.com/stretchr/testify/require "API documentation") package
+---------------------------------------------------------------------------------------------
+
+The `require` package provides same global functions as the `assert` package, but instead of returning a boolean result they terminate current test.
+
+See [t.FailNow](http://golang.org/pkg/testing/#T.FailNow) for details.
+
+[`mock`](http://godoc.org/github.com/stretchr/testify/mock "API documentation") package
+----------------------------------------------------------------------------------------
+
+The `mock` package provides a mechanism for easily writing mock objects that can be used in place of real objects when writing test code.
+
+An example test function that tests a piece of code that relies on an external object `testObj`, can setup expectations (testify) and assert that they indeed happened:
+
+```go
+package yours
+
+import (
+  "testing"
+  "github.com/stretchr/testify/mock"
+)
+
+/*
+  Test objects
+*/
+
+// MyMockedObject is a mocked object that implements an interface
+// that describes an object that the code I am testing relies on.
+type MyMockedObject struct{
+  mock.Mock
+}
+
+// DoSomething is a method on MyMockedObject that implements some interface
+// and just records the activity, and returns what the Mock object tells it to.
+//
+// In the real object, this method would do something useful, but since this
+// is a mocked object - we're just going to stub it out.
+//
+// NOTE: This method is not being tested here, code that uses this object is.
+func (m *MyMockedObject) DoSomething(number int) (bool, error) {
+
+  args := m.Called(number)
+  return args.Bool(0), args.Error(1)
+
+}
+
+/*
+  Actual test functions
+*/
+
+// TestSomething is an example of how to use our test object to
+// make assertions about some target code we are testing.
+func TestSomething(t *testing.T) {
+
+  // create an instance of our test object
+  testObj := new(MyMockedObject)
+
+  // setup expectations
+  testObj.On("DoSomething", 123).Return(true, nil)
+
+  // call the code we are testing
+  targetFuncThatDoesSomethingWithObj(testObj)
+
+  // assert that the expectations were met
+  testObj.AssertExpectations(t)
+
+
+}
+
+// TestSomethingElse is a second example of how to use our test object to
+// make assertions about some target code we are testing.
+// This time using a placeholder. Placeholders might be used when the
+// data being passed in is normally dynamically generated and cannot be
+// predicted beforehand (eg. containing hashes that are time sensitive)
+func TestSomethingElse(t *testing.T) {
+
+  // create an instance of our test object
+  testObj := new(MyMockedObject)
+
+  // setup expectations with a placeholder in the argument list
+  testObj.On("DoSomething", mock.Anything).Return(true, nil)
+
+  // call the code we are testing
+  targetFuncThatDoesSomethingWithObj(testObj)
+
+  // assert that the expectations were met
+  testObj.AssertExpectations(t)
+
+
+}
+```
+
+For more information on how to write mock code, check out the [API documentation for the `mock` package](http://godoc.org/github.com/stretchr/testify/mock).
+
+You can use the [mockery tool](http://github.com/vektra/mockery) to autogenerate the mock code against an interface as well, making using mocks much quicker.
+
+[`suite`](http://godoc.org/github.com/stretchr/testify/suite "API documentation") package
+-----------------------------------------------------------------------------------------
+
+The `suite` package provides functionality that you might be used to from more common object oriented languages.  With it, you can build a testing suite as a struct, build setup/teardown methods and testing methods on your struct, and run them with 'go test' as per normal.
+
+An example suite is shown below:
+
+```go
+// Basic imports
+import (
+    "testing"
+    "github.com/stretchr/testify/assert"
+    "github.com/stretchr/testify/suite"
+)
+
+// Define the suite, and absorb the built-in basic suite
+// functionality from testify - including a T() method which
+// returns the current testing context
+type ExampleTestSuite struct {
+    suite.Suite
+    VariableThatShouldStartAtFive int
+}
+
+// Make sure that VariableThatShouldStartAtFive is set to five
+// before each test
+func (suite *ExampleTestSuite) SetupTest() {
+    suite.VariableThatShouldStartAtFive = 5
+}
+
+// All methods that begin with "Test" are run as tests within a
+// suite.
+func (suite *ExampleTestSuite) TestExample() {
+    assert.Equal(suite.T(), 5, suite.VariableThatShouldStartAtFive)
+}
+
+// In order for 'go test' to run this suite, we need to create
+// a normal test function and pass our suite to suite.Run
+func TestExampleTestSuite(t *testing.T) {
+    suite.Run(t, new(ExampleTestSuite))
+}
+```
+
+For a more complete example, using all of the functionality provided by the suite package, look at our [example testing suite](https://github.com/stretchr/testify/blob/master/suite/suite_test.go)
+
+For more information on writing suites, check out the [API documentation for the `suite` package](http://godoc.org/github.com/stretchr/testify/suite).
+
+`Suite` object has assertion methods:
+
+```go
+// Basic imports
+import (
+    "testing"
+    "github.com/stretchr/testify/suite"
+)
+
+// Define the suite, and absorb the built-in basic suite
+// functionality from testify - including assertion methods.
+type ExampleTestSuite struct {
+    suite.Suite
+    VariableThatShouldStartAtFive int
+}
+
+// Make sure that VariableThatShouldStartAtFive is set to five
+// before each test
+func (suite *ExampleTestSuite) SetupTest() {
+    suite.VariableThatShouldStartAtFive = 5
+}
+
+// All methods that begin with "Test" are run as tests within a
+// suite.
+func (suite *ExampleTestSuite) TestExample() {
+    suite.Equal(suite.VariableThatShouldStartAtFive, 5)
+}
+
+// In order for 'go test' to run this suite, we need to create
+// a normal test function and pass our suite to suite.Run
+func TestExampleTestSuite(t *testing.T) {
+    suite.Run(t, new(ExampleTestSuite))
+}
+```
+
+------
+
+Installation
+============
+
+To install Testify, use `go get`:
+
+    go get github.com/stretchr/testify
+
+This will then make the following packages available to you:
+
+    github.com/stretchr/testify/assert
+    github.com/stretchr/testify/mock
+    github.com/stretchr/testify/http
+
+Import the `testify/assert` package into your code using this template:
+
+```go
+package yours
+
+import (
+  "testing"
+  "github.com/stretchr/testify/assert"
+)
+
+func TestSomething(t *testing.T) {
+
+  assert.True(t, true, "True is true!")
+
+}
+```
+
+------
+
+Staying up to date
+==================
+
+To update Testify to the latest version, use `go get -u github.com/stretchr/testify`.
+
+------
+
+Supported go versions
+==================
+
+We support the three major Go versions, which are 1.9, 1.10, and 1.11 at the moment.
+
+------
+
+Contributing
+============
+
+Please feel free to submit issues, fork the repository and send pull requests!
+
+When submitting an issue, we ask that you please include a complete test function that demonstrates the issue.  Extra credit for those using Testify to write the test code that demonstrates it.
+
+------
+
+License
+=======
+
+This project is licensed under the terms of the MIT license.
diff --git a/go/vendor/github.com/stretchr/testify/assert/assertion_format.go b/go/vendor/github.com/stretchr/testify/assert/assertion_format.go
new file mode 100644
index 0000000..aa1c2b9
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/assertion_format.go
@@ -0,0 +1,484 @@
+/*
+* CODE GENERATED AUTOMATICALLY WITH github.com/stretchr/testify/_codegen
+* THIS FILE MUST NOT BE EDITED BY HAND
+ */
+
+package assert
+
+import (
+	http "net/http"
+	url "net/url"
+	time "time"
+)
+
+// Conditionf uses a Comparison to assert a complex condition.
+func Conditionf(t TestingT, comp Comparison, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Condition(t, comp, append([]interface{}{msg}, args...)...)
+}
+
+// Containsf asserts that the specified string, list(array, slice...) or map contains the
+// specified substring or element.
+//
+//    assert.Containsf(t, "Hello World", "World", "error message %s", "formatted")
+//    assert.Containsf(t, ["Hello", "World"], "World", "error message %s", "formatted")
+//    assert.Containsf(t, {"Hello": "World"}, "Hello", "error message %s", "formatted")
+func Containsf(t TestingT, s interface{}, contains interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Contains(t, s, contains, append([]interface{}{msg}, args...)...)
+}
+
+// DirExistsf checks whether a directory exists in the given path. It also fails if the path is a file rather a directory or there is an error checking whether it exists.
+func DirExistsf(t TestingT, path string, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return DirExists(t, path, append([]interface{}{msg}, args...)...)
+}
+
+// ElementsMatchf asserts that the specified listA(array, slice...) is equal to specified
+// listB(array, slice...) ignoring the order of the elements. If there are duplicate elements,
+// the number of appearances of each of them in both lists should match.
+//
+// assert.ElementsMatchf(t, [1, 3, 2, 3], [1, 3, 3, 2], "error message %s", "formatted")
+func ElementsMatchf(t TestingT, listA interface{}, listB interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return ElementsMatch(t, listA, listB, append([]interface{}{msg}, args...)...)
+}
+
+// Emptyf asserts that the specified object is empty.  I.e. nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  assert.Emptyf(t, obj, "error message %s", "formatted")
+func Emptyf(t TestingT, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Empty(t, object, append([]interface{}{msg}, args...)...)
+}
+
+// Equalf asserts that two objects are equal.
+//
+//    assert.Equalf(t, 123, 123, "error message %s", "formatted")
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses). Function equality
+// cannot be determined and will always fail.
+func Equalf(t TestingT, expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Equal(t, expected, actual, append([]interface{}{msg}, args...)...)
+}
+
+// EqualErrorf asserts that a function returned an error (i.e. not `nil`)
+// and that it is equal to the provided error.
+//
+//   actualObj, err := SomeFunction()
+//   assert.EqualErrorf(t, err,  expectedErrorString, "error message %s", "formatted")
+func EqualErrorf(t TestingT, theError error, errString string, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return EqualError(t, theError, errString, append([]interface{}{msg}, args...)...)
+}
+
+// EqualValuesf asserts that two objects are equal or convertable to the same types
+// and equal.
+//
+//    assert.EqualValuesf(t, uint32(123, "error message %s", "formatted"), int32(123))
+func EqualValuesf(t TestingT, expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return EqualValues(t, expected, actual, append([]interface{}{msg}, args...)...)
+}
+
+// Errorf asserts that a function returned an error (i.e. not `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if assert.Errorf(t, err, "error message %s", "formatted") {
+// 	   assert.Equal(t, expectedErrorf, err)
+//   }
+func Errorf(t TestingT, err error, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Error(t, err, append([]interface{}{msg}, args...)...)
+}
+
+// Exactlyf asserts that two objects are equal in value and type.
+//
+//    assert.Exactlyf(t, int32(123, "error message %s", "formatted"), int64(123))
+func Exactlyf(t TestingT, expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Exactly(t, expected, actual, append([]interface{}{msg}, args...)...)
+}
+
+// Failf reports a failure through
+func Failf(t TestingT, failureMessage string, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Fail(t, failureMessage, append([]interface{}{msg}, args...)...)
+}
+
+// FailNowf fails test
+func FailNowf(t TestingT, failureMessage string, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return FailNow(t, failureMessage, append([]interface{}{msg}, args...)...)
+}
+
+// Falsef asserts that the specified value is false.
+//
+//    assert.Falsef(t, myBool, "error message %s", "formatted")
+func Falsef(t TestingT, value bool, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return False(t, value, append([]interface{}{msg}, args...)...)
+}
+
+// FileExistsf checks whether a file exists in the given path. It also fails if the path points to a directory or there is an error when trying to check the file.
+func FileExistsf(t TestingT, path string, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return FileExists(t, path, append([]interface{}{msg}, args...)...)
+}
+
+// HTTPBodyContainsf asserts that a specified handler returns a
+// body that contains a string.
+//
+//  assert.HTTPBodyContainsf(t, myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPBodyContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPBodyContains(t, handler, method, url, values, str, append([]interface{}{msg}, args...)...)
+}
+
+// HTTPBodyNotContainsf asserts that a specified handler returns a
+// body that does not contain a string.
+//
+//  assert.HTTPBodyNotContainsf(t, myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPBodyNotContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPBodyNotContains(t, handler, method, url, values, str, append([]interface{}{msg}, args...)...)
+}
+
+// HTTPErrorf asserts that a specified handler returns an error status code.
+//
+//  assert.HTTPErrorf(t, myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
+func HTTPErrorf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPError(t, handler, method, url, values, append([]interface{}{msg}, args...)...)
+}
+
+// HTTPRedirectf asserts that a specified handler returns a redirect status code.
+//
+//  assert.HTTPRedirectf(t, myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
+func HTTPRedirectf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPRedirect(t, handler, method, url, values, append([]interface{}{msg}, args...)...)
+}
+
+// HTTPSuccessf asserts that a specified handler returns a success status code.
+//
+//  assert.HTTPSuccessf(t, myHandler, "POST", "http://www.google.com", nil, "error message %s", "formatted")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPSuccessf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPSuccess(t, handler, method, url, values, append([]interface{}{msg}, args...)...)
+}
+
+// Implementsf asserts that an object is implemented by the specified interface.
+//
+//    assert.Implementsf(t, (*MyInterface, "error message %s", "formatted")(nil), new(MyObject))
+func Implementsf(t TestingT, interfaceObject interface{}, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Implements(t, interfaceObject, object, append([]interface{}{msg}, args...)...)
+}
+
+// InDeltaf asserts that the two numerals are within delta of each other.
+//
+// 	 assert.InDeltaf(t, math.Pi, (22 / 7.0, "error message %s", "formatted"), 0.01)
+func InDeltaf(t TestingT, expected interface{}, actual interface{}, delta float64, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDelta(t, expected, actual, delta, append([]interface{}{msg}, args...)...)
+}
+
+// InDeltaMapValuesf is the same as InDelta, but it compares all values between two maps. Both maps must have exactly the same keys.
+func InDeltaMapValuesf(t TestingT, expected interface{}, actual interface{}, delta float64, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDeltaMapValues(t, expected, actual, delta, append([]interface{}{msg}, args...)...)
+}
+
+// InDeltaSlicef is the same as InDelta, except it compares two slices.
+func InDeltaSlicef(t TestingT, expected interface{}, actual interface{}, delta float64, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDeltaSlice(t, expected, actual, delta, append([]interface{}{msg}, args...)...)
+}
+
+// InEpsilonf asserts that expected and actual have a relative error less than epsilon
+func InEpsilonf(t TestingT, expected interface{}, actual interface{}, epsilon float64, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return InEpsilon(t, expected, actual, epsilon, append([]interface{}{msg}, args...)...)
+}
+
+// InEpsilonSlicef is the same as InEpsilon, except it compares each value from two slices.
+func InEpsilonSlicef(t TestingT, expected interface{}, actual interface{}, epsilon float64, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return InEpsilonSlice(t, expected, actual, epsilon, append([]interface{}{msg}, args...)...)
+}
+
+// IsTypef asserts that the specified objects are of the same type.
+func IsTypef(t TestingT, expectedType interface{}, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return IsType(t, expectedType, object, append([]interface{}{msg}, args...)...)
+}
+
+// JSONEqf asserts that two JSON strings are equivalent.
+//
+//  assert.JSONEqf(t, `{"hello": "world", "foo": "bar"}`, `{"foo": "bar", "hello": "world"}`, "error message %s", "formatted")
+func JSONEqf(t TestingT, expected string, actual string, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return JSONEq(t, expected, actual, append([]interface{}{msg}, args...)...)
+}
+
+// Lenf asserts that the specified object has specific length.
+// Lenf also fails if the object has a type that len() not accept.
+//
+//    assert.Lenf(t, mySlice, 3, "error message %s", "formatted")
+func Lenf(t TestingT, object interface{}, length int, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Len(t, object, length, append([]interface{}{msg}, args...)...)
+}
+
+// Nilf asserts that the specified object is nil.
+//
+//    assert.Nilf(t, err, "error message %s", "formatted")
+func Nilf(t TestingT, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Nil(t, object, append([]interface{}{msg}, args...)...)
+}
+
+// NoErrorf asserts that a function returned no error (i.e. `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if assert.NoErrorf(t, err, "error message %s", "formatted") {
+// 	   assert.Equal(t, expectedObj, actualObj)
+//   }
+func NoErrorf(t TestingT, err error, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NoError(t, err, append([]interface{}{msg}, args...)...)
+}
+
+// NotContainsf asserts that the specified string, list(array, slice...) or map does NOT contain the
+// specified substring or element.
+//
+//    assert.NotContainsf(t, "Hello World", "Earth", "error message %s", "formatted")
+//    assert.NotContainsf(t, ["Hello", "World"], "Earth", "error message %s", "formatted")
+//    assert.NotContainsf(t, {"Hello": "World"}, "Earth", "error message %s", "formatted")
+func NotContainsf(t TestingT, s interface{}, contains interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotContains(t, s, contains, append([]interface{}{msg}, args...)...)
+}
+
+// NotEmptyf asserts that the specified object is NOT empty.  I.e. not nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  if assert.NotEmptyf(t, obj, "error message %s", "formatted") {
+//    assert.Equal(t, "two", obj[1])
+//  }
+func NotEmptyf(t TestingT, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotEmpty(t, object, append([]interface{}{msg}, args...)...)
+}
+
+// NotEqualf asserts that the specified values are NOT equal.
+//
+//    assert.NotEqualf(t, obj1, obj2, "error message %s", "formatted")
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses).
+func NotEqualf(t TestingT, expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotEqual(t, expected, actual, append([]interface{}{msg}, args...)...)
+}
+
+// NotNilf asserts that the specified object is not nil.
+//
+//    assert.NotNilf(t, err, "error message %s", "formatted")
+func NotNilf(t TestingT, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotNil(t, object, append([]interface{}{msg}, args...)...)
+}
+
+// NotPanicsf asserts that the code inside the specified PanicTestFunc does NOT panic.
+//
+//   assert.NotPanicsf(t, func(){ RemainCalm() }, "error message %s", "formatted")
+func NotPanicsf(t TestingT, f PanicTestFunc, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotPanics(t, f, append([]interface{}{msg}, args...)...)
+}
+
+// NotRegexpf asserts that a specified regexp does not match a string.
+//
+//  assert.NotRegexpf(t, regexp.MustCompile("starts", "error message %s", "formatted"), "it's starting")
+//  assert.NotRegexpf(t, "^start", "it's not starting", "error message %s", "formatted")
+func NotRegexpf(t TestingT, rx interface{}, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotRegexp(t, rx, str, append([]interface{}{msg}, args...)...)
+}
+
+// NotSubsetf asserts that the specified list(array, slice...) contains not all
+// elements given in the specified subset(array, slice...).
+//
+//    assert.NotSubsetf(t, [1, 3, 4], [1, 2], "But [1, 3, 4] does not contain [1, 2]", "error message %s", "formatted")
+func NotSubsetf(t TestingT, list interface{}, subset interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotSubset(t, list, subset, append([]interface{}{msg}, args...)...)
+}
+
+// NotZerof asserts that i is not the zero value for its type.
+func NotZerof(t TestingT, i interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotZero(t, i, append([]interface{}{msg}, args...)...)
+}
+
+// Panicsf asserts that the code inside the specified PanicTestFunc panics.
+//
+//   assert.Panicsf(t, func(){ GoCrazy() }, "error message %s", "formatted")
+func Panicsf(t TestingT, f PanicTestFunc, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Panics(t, f, append([]interface{}{msg}, args...)...)
+}
+
+// PanicsWithValuef asserts that the code inside the specified PanicTestFunc panics, and that
+// the recovered panic value equals the expected panic value.
+//
+//   assert.PanicsWithValuef(t, "crazy error", func(){ GoCrazy() }, "error message %s", "formatted")
+func PanicsWithValuef(t TestingT, expected interface{}, f PanicTestFunc, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return PanicsWithValue(t, expected, f, append([]interface{}{msg}, args...)...)
+}
+
+// Regexpf asserts that a specified regexp matches a string.
+//
+//  assert.Regexpf(t, regexp.MustCompile("start", "error message %s", "formatted"), "it's starting")
+//  assert.Regexpf(t, "start...$", "it's not starting", "error message %s", "formatted")
+func Regexpf(t TestingT, rx interface{}, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Regexp(t, rx, str, append([]interface{}{msg}, args...)...)
+}
+
+// Subsetf asserts that the specified list(array, slice...) contains all
+// elements given in the specified subset(array, slice...).
+//
+//    assert.Subsetf(t, [1, 2, 3], [1, 2], "But [1, 2, 3] does contain [1, 2]", "error message %s", "formatted")
+func Subsetf(t TestingT, list interface{}, subset interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Subset(t, list, subset, append([]interface{}{msg}, args...)...)
+}
+
+// Truef asserts that the specified value is true.
+//
+//    assert.Truef(t, myBool, "error message %s", "formatted")
+func Truef(t TestingT, value bool, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return True(t, value, append([]interface{}{msg}, args...)...)
+}
+
+// WithinDurationf asserts that the two times are within duration delta of each other.
+//
+//   assert.WithinDurationf(t, time.Now(), time.Now(), 10*time.Second, "error message %s", "formatted")
+func WithinDurationf(t TestingT, expected time.Time, actual time.Time, delta time.Duration, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return WithinDuration(t, expected, actual, delta, append([]interface{}{msg}, args...)...)
+}
+
+// Zerof asserts that i is the zero value for its type.
+func Zerof(t TestingT, i interface{}, msg string, args ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	return Zero(t, i, append([]interface{}{msg}, args...)...)
+}
diff --git a/go/vendor/github.com/stretchr/testify/assert/assertion_format.go.tmpl b/go/vendor/github.com/stretchr/testify/assert/assertion_format.go.tmpl
new file mode 100644
index 0000000..d2bb0b8
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/assertion_format.go.tmpl
@@ -0,0 +1,5 @@
+{{.CommentFormat}}
+func {{.DocInfo.Name}}f(t TestingT, {{.ParamsFormat}}) bool {
+	if h, ok := t.(tHelper); ok { h.Helper() }
+	return {{.DocInfo.Name}}(t, {{.ForwardedParamsFormat}})
+}
diff --git a/go/vendor/github.com/stretchr/testify/assert/assertion_forward.go b/go/vendor/github.com/stretchr/testify/assert/assertion_forward.go
new file mode 100644
index 0000000..de39f79
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/assertion_forward.go
@@ -0,0 +1,956 @@
+/*
+* CODE GENERATED AUTOMATICALLY WITH github.com/stretchr/testify/_codegen
+* THIS FILE MUST NOT BE EDITED BY HAND
+ */
+
+package assert
+
+import (
+	http "net/http"
+	url "net/url"
+	time "time"
+)
+
+// Condition uses a Comparison to assert a complex condition.
+func (a *Assertions) Condition(comp Comparison, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Condition(a.t, comp, msgAndArgs...)
+}
+
+// Conditionf uses a Comparison to assert a complex condition.
+func (a *Assertions) Conditionf(comp Comparison, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Conditionf(a.t, comp, msg, args...)
+}
+
+// Contains asserts that the specified string, list(array, slice...) or map contains the
+// specified substring or element.
+//
+//    a.Contains("Hello World", "World")
+//    a.Contains(["Hello", "World"], "World")
+//    a.Contains({"Hello": "World"}, "Hello")
+func (a *Assertions) Contains(s interface{}, contains interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Contains(a.t, s, contains, msgAndArgs...)
+}
+
+// Containsf asserts that the specified string, list(array, slice...) or map contains the
+// specified substring or element.
+//
+//    a.Containsf("Hello World", "World", "error message %s", "formatted")
+//    a.Containsf(["Hello", "World"], "World", "error message %s", "formatted")
+//    a.Containsf({"Hello": "World"}, "Hello", "error message %s", "formatted")
+func (a *Assertions) Containsf(s interface{}, contains interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Containsf(a.t, s, contains, msg, args...)
+}
+
+// DirExists checks whether a directory exists in the given path. It also fails if the path is a file rather a directory or there is an error checking whether it exists.
+func (a *Assertions) DirExists(path string, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return DirExists(a.t, path, msgAndArgs...)
+}
+
+// DirExistsf checks whether a directory exists in the given path. It also fails if the path is a file rather a directory or there is an error checking whether it exists.
+func (a *Assertions) DirExistsf(path string, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return DirExistsf(a.t, path, msg, args...)
+}
+
+// ElementsMatch asserts that the specified listA(array, slice...) is equal to specified
+// listB(array, slice...) ignoring the order of the elements. If there are duplicate elements,
+// the number of appearances of each of them in both lists should match.
+//
+// a.ElementsMatch([1, 3, 2, 3], [1, 3, 3, 2])
+func (a *Assertions) ElementsMatch(listA interface{}, listB interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return ElementsMatch(a.t, listA, listB, msgAndArgs...)
+}
+
+// ElementsMatchf asserts that the specified listA(array, slice...) is equal to specified
+// listB(array, slice...) ignoring the order of the elements. If there are duplicate elements,
+// the number of appearances of each of them in both lists should match.
+//
+// a.ElementsMatchf([1, 3, 2, 3], [1, 3, 3, 2], "error message %s", "formatted")
+func (a *Assertions) ElementsMatchf(listA interface{}, listB interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return ElementsMatchf(a.t, listA, listB, msg, args...)
+}
+
+// Empty asserts that the specified object is empty.  I.e. nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  a.Empty(obj)
+func (a *Assertions) Empty(object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Empty(a.t, object, msgAndArgs...)
+}
+
+// Emptyf asserts that the specified object is empty.  I.e. nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  a.Emptyf(obj, "error message %s", "formatted")
+func (a *Assertions) Emptyf(object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Emptyf(a.t, object, msg, args...)
+}
+
+// Equal asserts that two objects are equal.
+//
+//    a.Equal(123, 123)
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses). Function equality
+// cannot be determined and will always fail.
+func (a *Assertions) Equal(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Equal(a.t, expected, actual, msgAndArgs...)
+}
+
+// EqualError asserts that a function returned an error (i.e. not `nil`)
+// and that it is equal to the provided error.
+//
+//   actualObj, err := SomeFunction()
+//   a.EqualError(err,  expectedErrorString)
+func (a *Assertions) EqualError(theError error, errString string, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return EqualError(a.t, theError, errString, msgAndArgs...)
+}
+
+// EqualErrorf asserts that a function returned an error (i.e. not `nil`)
+// and that it is equal to the provided error.
+//
+//   actualObj, err := SomeFunction()
+//   a.EqualErrorf(err,  expectedErrorString, "error message %s", "formatted")
+func (a *Assertions) EqualErrorf(theError error, errString string, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return EqualErrorf(a.t, theError, errString, msg, args...)
+}
+
+// EqualValues asserts that two objects are equal or convertable to the same types
+// and equal.
+//
+//    a.EqualValues(uint32(123), int32(123))
+func (a *Assertions) EqualValues(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return EqualValues(a.t, expected, actual, msgAndArgs...)
+}
+
+// EqualValuesf asserts that two objects are equal or convertable to the same types
+// and equal.
+//
+//    a.EqualValuesf(uint32(123, "error message %s", "formatted"), int32(123))
+func (a *Assertions) EqualValuesf(expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return EqualValuesf(a.t, expected, actual, msg, args...)
+}
+
+// Equalf asserts that two objects are equal.
+//
+//    a.Equalf(123, 123, "error message %s", "formatted")
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses). Function equality
+// cannot be determined and will always fail.
+func (a *Assertions) Equalf(expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Equalf(a.t, expected, actual, msg, args...)
+}
+
+// Error asserts that a function returned an error (i.e. not `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if a.Error(err) {
+// 	   assert.Equal(t, expectedError, err)
+//   }
+func (a *Assertions) Error(err error, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Error(a.t, err, msgAndArgs...)
+}
+
+// Errorf asserts that a function returned an error (i.e. not `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if a.Errorf(err, "error message %s", "formatted") {
+// 	   assert.Equal(t, expectedErrorf, err)
+//   }
+func (a *Assertions) Errorf(err error, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Errorf(a.t, err, msg, args...)
+}
+
+// Exactly asserts that two objects are equal in value and type.
+//
+//    a.Exactly(int32(123), int64(123))
+func (a *Assertions) Exactly(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Exactly(a.t, expected, actual, msgAndArgs...)
+}
+
+// Exactlyf asserts that two objects are equal in value and type.
+//
+//    a.Exactlyf(int32(123, "error message %s", "formatted"), int64(123))
+func (a *Assertions) Exactlyf(expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Exactlyf(a.t, expected, actual, msg, args...)
+}
+
+// Fail reports a failure through
+func (a *Assertions) Fail(failureMessage string, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Fail(a.t, failureMessage, msgAndArgs...)
+}
+
+// FailNow fails test
+func (a *Assertions) FailNow(failureMessage string, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return FailNow(a.t, failureMessage, msgAndArgs...)
+}
+
+// FailNowf fails test
+func (a *Assertions) FailNowf(failureMessage string, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return FailNowf(a.t, failureMessage, msg, args...)
+}
+
+// Failf reports a failure through
+func (a *Assertions) Failf(failureMessage string, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Failf(a.t, failureMessage, msg, args...)
+}
+
+// False asserts that the specified value is false.
+//
+//    a.False(myBool)
+func (a *Assertions) False(value bool, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return False(a.t, value, msgAndArgs...)
+}
+
+// Falsef asserts that the specified value is false.
+//
+//    a.Falsef(myBool, "error message %s", "formatted")
+func (a *Assertions) Falsef(value bool, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Falsef(a.t, value, msg, args...)
+}
+
+// FileExists checks whether a file exists in the given path. It also fails if the path points to a directory or there is an error when trying to check the file.
+func (a *Assertions) FileExists(path string, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return FileExists(a.t, path, msgAndArgs...)
+}
+
+// FileExistsf checks whether a file exists in the given path. It also fails if the path points to a directory or there is an error when trying to check the file.
+func (a *Assertions) FileExistsf(path string, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return FileExistsf(a.t, path, msg, args...)
+}
+
+// HTTPBodyContains asserts that a specified handler returns a
+// body that contains a string.
+//
+//  a.HTTPBodyContains(myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPBodyContains(a.t, handler, method, url, values, str, msgAndArgs...)
+}
+
+// HTTPBodyContainsf asserts that a specified handler returns a
+// body that contains a string.
+//
+//  a.HTTPBodyContainsf(myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPBodyContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPBodyContainsf(a.t, handler, method, url, values, str, msg, args...)
+}
+
+// HTTPBodyNotContains asserts that a specified handler returns a
+// body that does not contain a string.
+//
+//  a.HTTPBodyNotContains(myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPBodyNotContains(a.t, handler, method, url, values, str, msgAndArgs...)
+}
+
+// HTTPBodyNotContainsf asserts that a specified handler returns a
+// body that does not contain a string.
+//
+//  a.HTTPBodyNotContainsf(myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPBodyNotContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPBodyNotContainsf(a.t, handler, method, url, values, str, msg, args...)
+}
+
+// HTTPError asserts that a specified handler returns an error status code.
+//
+//  a.HTTPError(myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPError(a.t, handler, method, url, values, msgAndArgs...)
+}
+
+// HTTPErrorf asserts that a specified handler returns an error status code.
+//
+//  a.HTTPErrorf(myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
+func (a *Assertions) HTTPErrorf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPErrorf(a.t, handler, method, url, values, msg, args...)
+}
+
+// HTTPRedirect asserts that a specified handler returns a redirect status code.
+//
+//  a.HTTPRedirect(myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPRedirect(a.t, handler, method, url, values, msgAndArgs...)
+}
+
+// HTTPRedirectf asserts that a specified handler returns a redirect status code.
+//
+//  a.HTTPRedirectf(myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
+func (a *Assertions) HTTPRedirectf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPRedirectf(a.t, handler, method, url, values, msg, args...)
+}
+
+// HTTPSuccess asserts that a specified handler returns a success status code.
+//
+//  a.HTTPSuccess(myHandler, "POST", "http://www.google.com", nil)
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPSuccess(a.t, handler, method, url, values, msgAndArgs...)
+}
+
+// HTTPSuccessf asserts that a specified handler returns a success status code.
+//
+//  a.HTTPSuccessf(myHandler, "POST", "http://www.google.com", nil, "error message %s", "formatted")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func (a *Assertions) HTTPSuccessf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return HTTPSuccessf(a.t, handler, method, url, values, msg, args...)
+}
+
+// Implements asserts that an object is implemented by the specified interface.
+//
+//    a.Implements((*MyInterface)(nil), new(MyObject))
+func (a *Assertions) Implements(interfaceObject interface{}, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Implements(a.t, interfaceObject, object, msgAndArgs...)
+}
+
+// Implementsf asserts that an object is implemented by the specified interface.
+//
+//    a.Implementsf((*MyInterface, "error message %s", "formatted")(nil), new(MyObject))
+func (a *Assertions) Implementsf(interfaceObject interface{}, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Implementsf(a.t, interfaceObject, object, msg, args...)
+}
+
+// InDelta asserts that the two numerals are within delta of each other.
+//
+// 	 a.InDelta(math.Pi, (22 / 7.0), 0.01)
+func (a *Assertions) InDelta(expected interface{}, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDelta(a.t, expected, actual, delta, msgAndArgs...)
+}
+
+// InDeltaMapValues is the same as InDelta, but it compares all values between two maps. Both maps must have exactly the same keys.
+func (a *Assertions) InDeltaMapValues(expected interface{}, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDeltaMapValues(a.t, expected, actual, delta, msgAndArgs...)
+}
+
+// InDeltaMapValuesf is the same as InDelta, but it compares all values between two maps. Both maps must have exactly the same keys.
+func (a *Assertions) InDeltaMapValuesf(expected interface{}, actual interface{}, delta float64, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDeltaMapValuesf(a.t, expected, actual, delta, msg, args...)
+}
+
+// InDeltaSlice is the same as InDelta, except it compares two slices.
+func (a *Assertions) InDeltaSlice(expected interface{}, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDeltaSlice(a.t, expected, actual, delta, msgAndArgs...)
+}
+
+// InDeltaSlicef is the same as InDelta, except it compares two slices.
+func (a *Assertions) InDeltaSlicef(expected interface{}, actual interface{}, delta float64, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDeltaSlicef(a.t, expected, actual, delta, msg, args...)
+}
+
+// InDeltaf asserts that the two numerals are within delta of each other.
+//
+// 	 a.InDeltaf(math.Pi, (22 / 7.0, "error message %s", "formatted"), 0.01)
+func (a *Assertions) InDeltaf(expected interface{}, actual interface{}, delta float64, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InDeltaf(a.t, expected, actual, delta, msg, args...)
+}
+
+// InEpsilon asserts that expected and actual have a relative error less than epsilon
+func (a *Assertions) InEpsilon(expected interface{}, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InEpsilon(a.t, expected, actual, epsilon, msgAndArgs...)
+}
+
+// InEpsilonSlice is the same as InEpsilon, except it compares each value from two slices.
+func (a *Assertions) InEpsilonSlice(expected interface{}, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InEpsilonSlice(a.t, expected, actual, epsilon, msgAndArgs...)
+}
+
+// InEpsilonSlicef is the same as InEpsilon, except it compares each value from two slices.
+func (a *Assertions) InEpsilonSlicef(expected interface{}, actual interface{}, epsilon float64, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InEpsilonSlicef(a.t, expected, actual, epsilon, msg, args...)
+}
+
+// InEpsilonf asserts that expected and actual have a relative error less than epsilon
+func (a *Assertions) InEpsilonf(expected interface{}, actual interface{}, epsilon float64, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return InEpsilonf(a.t, expected, actual, epsilon, msg, args...)
+}
+
+// IsType asserts that the specified objects are of the same type.
+func (a *Assertions) IsType(expectedType interface{}, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return IsType(a.t, expectedType, object, msgAndArgs...)
+}
+
+// IsTypef asserts that the specified objects are of the same type.
+func (a *Assertions) IsTypef(expectedType interface{}, object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return IsTypef(a.t, expectedType, object, msg, args...)
+}
+
+// JSONEq asserts that two JSON strings are equivalent.
+//
+//  a.JSONEq(`{"hello": "world", "foo": "bar"}`, `{"foo": "bar", "hello": "world"}`)
+func (a *Assertions) JSONEq(expected string, actual string, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return JSONEq(a.t, expected, actual, msgAndArgs...)
+}
+
+// JSONEqf asserts that two JSON strings are equivalent.
+//
+//  a.JSONEqf(`{"hello": "world", "foo": "bar"}`, `{"foo": "bar", "hello": "world"}`, "error message %s", "formatted")
+func (a *Assertions) JSONEqf(expected string, actual string, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return JSONEqf(a.t, expected, actual, msg, args...)
+}
+
+// Len asserts that the specified object has specific length.
+// Len also fails if the object has a type that len() not accept.
+//
+//    a.Len(mySlice, 3)
+func (a *Assertions) Len(object interface{}, length int, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Len(a.t, object, length, msgAndArgs...)
+}
+
+// Lenf asserts that the specified object has specific length.
+// Lenf also fails if the object has a type that len() not accept.
+//
+//    a.Lenf(mySlice, 3, "error message %s", "formatted")
+func (a *Assertions) Lenf(object interface{}, length int, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Lenf(a.t, object, length, msg, args...)
+}
+
+// Nil asserts that the specified object is nil.
+//
+//    a.Nil(err)
+func (a *Assertions) Nil(object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Nil(a.t, object, msgAndArgs...)
+}
+
+// Nilf asserts that the specified object is nil.
+//
+//    a.Nilf(err, "error message %s", "formatted")
+func (a *Assertions) Nilf(object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Nilf(a.t, object, msg, args...)
+}
+
+// NoError asserts that a function returned no error (i.e. `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if a.NoError(err) {
+// 	   assert.Equal(t, expectedObj, actualObj)
+//   }
+func (a *Assertions) NoError(err error, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NoError(a.t, err, msgAndArgs...)
+}
+
+// NoErrorf asserts that a function returned no error (i.e. `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if a.NoErrorf(err, "error message %s", "formatted") {
+// 	   assert.Equal(t, expectedObj, actualObj)
+//   }
+func (a *Assertions) NoErrorf(err error, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NoErrorf(a.t, err, msg, args...)
+}
+
+// NotContains asserts that the specified string, list(array, slice...) or map does NOT contain the
+// specified substring or element.
+//
+//    a.NotContains("Hello World", "Earth")
+//    a.NotContains(["Hello", "World"], "Earth")
+//    a.NotContains({"Hello": "World"}, "Earth")
+func (a *Assertions) NotContains(s interface{}, contains interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotContains(a.t, s, contains, msgAndArgs...)
+}
+
+// NotContainsf asserts that the specified string, list(array, slice...) or map does NOT contain the
+// specified substring or element.
+//
+//    a.NotContainsf("Hello World", "Earth", "error message %s", "formatted")
+//    a.NotContainsf(["Hello", "World"], "Earth", "error message %s", "formatted")
+//    a.NotContainsf({"Hello": "World"}, "Earth", "error message %s", "formatted")
+func (a *Assertions) NotContainsf(s interface{}, contains interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotContainsf(a.t, s, contains, msg, args...)
+}
+
+// NotEmpty asserts that the specified object is NOT empty.  I.e. not nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  if a.NotEmpty(obj) {
+//    assert.Equal(t, "two", obj[1])
+//  }
+func (a *Assertions) NotEmpty(object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotEmpty(a.t, object, msgAndArgs...)
+}
+
+// NotEmptyf asserts that the specified object is NOT empty.  I.e. not nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  if a.NotEmptyf(obj, "error message %s", "formatted") {
+//    assert.Equal(t, "two", obj[1])
+//  }
+func (a *Assertions) NotEmptyf(object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotEmptyf(a.t, object, msg, args...)
+}
+
+// NotEqual asserts that the specified values are NOT equal.
+//
+//    a.NotEqual(obj1, obj2)
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses).
+func (a *Assertions) NotEqual(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotEqual(a.t, expected, actual, msgAndArgs...)
+}
+
+// NotEqualf asserts that the specified values are NOT equal.
+//
+//    a.NotEqualf(obj1, obj2, "error message %s", "formatted")
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses).
+func (a *Assertions) NotEqualf(expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotEqualf(a.t, expected, actual, msg, args...)
+}
+
+// NotNil asserts that the specified object is not nil.
+//
+//    a.NotNil(err)
+func (a *Assertions) NotNil(object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotNil(a.t, object, msgAndArgs...)
+}
+
+// NotNilf asserts that the specified object is not nil.
+//
+//    a.NotNilf(err, "error message %s", "formatted")
+func (a *Assertions) NotNilf(object interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotNilf(a.t, object, msg, args...)
+}
+
+// NotPanics asserts that the code inside the specified PanicTestFunc does NOT panic.
+//
+//   a.NotPanics(func(){ RemainCalm() })
+func (a *Assertions) NotPanics(f PanicTestFunc, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotPanics(a.t, f, msgAndArgs...)
+}
+
+// NotPanicsf asserts that the code inside the specified PanicTestFunc does NOT panic.
+//
+//   a.NotPanicsf(func(){ RemainCalm() }, "error message %s", "formatted")
+func (a *Assertions) NotPanicsf(f PanicTestFunc, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotPanicsf(a.t, f, msg, args...)
+}
+
+// NotRegexp asserts that a specified regexp does not match a string.
+//
+//  a.NotRegexp(regexp.MustCompile("starts"), "it's starting")
+//  a.NotRegexp("^start", "it's not starting")
+func (a *Assertions) NotRegexp(rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotRegexp(a.t, rx, str, msgAndArgs...)
+}
+
+// NotRegexpf asserts that a specified regexp does not match a string.
+//
+//  a.NotRegexpf(regexp.MustCompile("starts", "error message %s", "formatted"), "it's starting")
+//  a.NotRegexpf("^start", "it's not starting", "error message %s", "formatted")
+func (a *Assertions) NotRegexpf(rx interface{}, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotRegexpf(a.t, rx, str, msg, args...)
+}
+
+// NotSubset asserts that the specified list(array, slice...) contains not all
+// elements given in the specified subset(array, slice...).
+//
+//    a.NotSubset([1, 3, 4], [1, 2], "But [1, 3, 4] does not contain [1, 2]")
+func (a *Assertions) NotSubset(list interface{}, subset interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotSubset(a.t, list, subset, msgAndArgs...)
+}
+
+// NotSubsetf asserts that the specified list(array, slice...) contains not all
+// elements given in the specified subset(array, slice...).
+//
+//    a.NotSubsetf([1, 3, 4], [1, 2], "But [1, 3, 4] does not contain [1, 2]", "error message %s", "formatted")
+func (a *Assertions) NotSubsetf(list interface{}, subset interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotSubsetf(a.t, list, subset, msg, args...)
+}
+
+// NotZero asserts that i is not the zero value for its type.
+func (a *Assertions) NotZero(i interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotZero(a.t, i, msgAndArgs...)
+}
+
+// NotZerof asserts that i is not the zero value for its type.
+func (a *Assertions) NotZerof(i interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return NotZerof(a.t, i, msg, args...)
+}
+
+// Panics asserts that the code inside the specified PanicTestFunc panics.
+//
+//   a.Panics(func(){ GoCrazy() })
+func (a *Assertions) Panics(f PanicTestFunc, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Panics(a.t, f, msgAndArgs...)
+}
+
+// PanicsWithValue asserts that the code inside the specified PanicTestFunc panics, and that
+// the recovered panic value equals the expected panic value.
+//
+//   a.PanicsWithValue("crazy error", func(){ GoCrazy() })
+func (a *Assertions) PanicsWithValue(expected interface{}, f PanicTestFunc, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return PanicsWithValue(a.t, expected, f, msgAndArgs...)
+}
+
+// PanicsWithValuef asserts that the code inside the specified PanicTestFunc panics, and that
+// the recovered panic value equals the expected panic value.
+//
+//   a.PanicsWithValuef("crazy error", func(){ GoCrazy() }, "error message %s", "formatted")
+func (a *Assertions) PanicsWithValuef(expected interface{}, f PanicTestFunc, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return PanicsWithValuef(a.t, expected, f, msg, args...)
+}
+
+// Panicsf asserts that the code inside the specified PanicTestFunc panics.
+//
+//   a.Panicsf(func(){ GoCrazy() }, "error message %s", "formatted")
+func (a *Assertions) Panicsf(f PanicTestFunc, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Panicsf(a.t, f, msg, args...)
+}
+
+// Regexp asserts that a specified regexp matches a string.
+//
+//  a.Regexp(regexp.MustCompile("start"), "it's starting")
+//  a.Regexp("start...$", "it's not starting")
+func (a *Assertions) Regexp(rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Regexp(a.t, rx, str, msgAndArgs...)
+}
+
+// Regexpf asserts that a specified regexp matches a string.
+//
+//  a.Regexpf(regexp.MustCompile("start", "error message %s", "formatted"), "it's starting")
+//  a.Regexpf("start...$", "it's not starting", "error message %s", "formatted")
+func (a *Assertions) Regexpf(rx interface{}, str interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Regexpf(a.t, rx, str, msg, args...)
+}
+
+// Subset asserts that the specified list(array, slice...) contains all
+// elements given in the specified subset(array, slice...).
+//
+//    a.Subset([1, 2, 3], [1, 2], "But [1, 2, 3] does contain [1, 2]")
+func (a *Assertions) Subset(list interface{}, subset interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Subset(a.t, list, subset, msgAndArgs...)
+}
+
+// Subsetf asserts that the specified list(array, slice...) contains all
+// elements given in the specified subset(array, slice...).
+//
+//    a.Subsetf([1, 2, 3], [1, 2], "But [1, 2, 3] does contain [1, 2]", "error message %s", "formatted")
+func (a *Assertions) Subsetf(list interface{}, subset interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Subsetf(a.t, list, subset, msg, args...)
+}
+
+// True asserts that the specified value is true.
+//
+//    a.True(myBool)
+func (a *Assertions) True(value bool, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return True(a.t, value, msgAndArgs...)
+}
+
+// Truef asserts that the specified value is true.
+//
+//    a.Truef(myBool, "error message %s", "formatted")
+func (a *Assertions) Truef(value bool, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Truef(a.t, value, msg, args...)
+}
+
+// WithinDuration asserts that the two times are within duration delta of each other.
+//
+//   a.WithinDuration(time.Now(), time.Now(), 10*time.Second)
+func (a *Assertions) WithinDuration(expected time.Time, actual time.Time, delta time.Duration, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return WithinDuration(a.t, expected, actual, delta, msgAndArgs...)
+}
+
+// WithinDurationf asserts that the two times are within duration delta of each other.
+//
+//   a.WithinDurationf(time.Now(), time.Now(), 10*time.Second, "error message %s", "formatted")
+func (a *Assertions) WithinDurationf(expected time.Time, actual time.Time, delta time.Duration, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return WithinDurationf(a.t, expected, actual, delta, msg, args...)
+}
+
+// Zero asserts that i is the zero value for its type.
+func (a *Assertions) Zero(i interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Zero(a.t, i, msgAndArgs...)
+}
+
+// Zerof asserts that i is the zero value for its type.
+func (a *Assertions) Zerof(i interface{}, msg string, args ...interface{}) bool {
+	if h, ok := a.t.(tHelper); ok {
+		h.Helper()
+	}
+	return Zerof(a.t, i, msg, args...)
+}
diff --git a/go/vendor/github.com/stretchr/testify/assert/assertion_forward.go.tmpl b/go/vendor/github.com/stretchr/testify/assert/assertion_forward.go.tmpl
new file mode 100644
index 0000000..188bb9e
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/assertion_forward.go.tmpl
@@ -0,0 +1,5 @@
+{{.CommentWithoutT "a"}}
+func (a *Assertions) {{.DocInfo.Name}}({{.Params}}) bool {
+	if h, ok := a.t.(tHelper); ok { h.Helper() }
+	return {{.DocInfo.Name}}(a.t, {{.ForwardedParams}})
+}
diff --git a/go/vendor/github.com/stretchr/testify/assert/assertions.go b/go/vendor/github.com/stretchr/testify/assert/assertions.go
new file mode 100644
index 0000000..e8df681
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/assertions.go
@@ -0,0 +1,1398 @@
+package assert
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math"
+	"os"
+	"reflect"
+	"regexp"
+	"runtime"
+	"strings"
+	"time"
+	"unicode"
+	"unicode/utf8"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/pmezard/go-difflib/difflib"
+)
+
+//go:generate go run ../_codegen/main.go -output-package=assert -template=assertion_format.go.tmpl
+
+// TestingT is an interface wrapper around *testing.T
+type TestingT interface {
+	Errorf(format string, args ...interface{})
+}
+
+// ComparisonAssertionFunc is a common function prototype when comparing two values.  Can be useful
+// for table driven tests.
+type ComparisonAssertionFunc func(TestingT, interface{}, interface{}, ...interface{}) bool
+
+// ValueAssertionFunc is a common function prototype when validating a single value.  Can be useful
+// for table driven tests.
+type ValueAssertionFunc func(TestingT, interface{}, ...interface{}) bool
+
+// BoolAssertionFunc is a common function prototype when validating a bool value.  Can be useful
+// for table driven tests.
+type BoolAssertionFunc func(TestingT, bool, ...interface{}) bool
+
+// ErrorAssertionFunc is a common function prototype when validating an error value.  Can be useful
+// for table driven tests.
+type ErrorAssertionFunc func(TestingT, error, ...interface{}) bool
+
+// Comparison a custom function that returns true on success and false on failure
+type Comparison func() (success bool)
+
+/*
+	Helper functions
+*/
+
+// ObjectsAreEqual determines if two objects are considered equal.
+//
+// This function does no assertion of any kind.
+func ObjectsAreEqual(expected, actual interface{}) bool {
+	if expected == nil || actual == nil {
+		return expected == actual
+	}
+
+	exp, ok := expected.([]byte)
+	if !ok {
+		return reflect.DeepEqual(expected, actual)
+	}
+
+	act, ok := actual.([]byte)
+	if !ok {
+		return false
+	}
+	if exp == nil || act == nil {
+		return exp == nil && act == nil
+	}
+	return bytes.Equal(exp, act)
+}
+
+// ObjectsAreEqualValues gets whether two objects are equal, or if their
+// values are equal.
+func ObjectsAreEqualValues(expected, actual interface{}) bool {
+	if ObjectsAreEqual(expected, actual) {
+		return true
+	}
+
+	actualType := reflect.TypeOf(actual)
+	if actualType == nil {
+		return false
+	}
+	expectedValue := reflect.ValueOf(expected)
+	if expectedValue.IsValid() && expectedValue.Type().ConvertibleTo(actualType) {
+		// Attempt comparison after type conversion
+		return reflect.DeepEqual(expectedValue.Convert(actualType).Interface(), actual)
+	}
+
+	return false
+}
+
+/* CallerInfo is necessary because the assert functions use the testing object
+internally, causing it to print the file:line of the assert method, rather than where
+the problem actually occurred in calling code.*/
+
+// CallerInfo returns an array of strings containing the file and line number
+// of each stack frame leading from the current test to the assert call that
+// failed.
+func CallerInfo() []string {
+
+	pc := uintptr(0)
+	file := ""
+	line := 0
+	ok := false
+	name := ""
+
+	callers := []string{}
+	for i := 0; ; i++ {
+		pc, file, line, ok = runtime.Caller(i)
+		if !ok {
+			// The breaks below failed to terminate the loop, and we ran off the
+			// end of the call stack.
+			break
+		}
+
+		// This is a huge edge case, but it will panic if this is the case, see #180
+		if file == "<autogenerated>" {
+			break
+		}
+
+		f := runtime.FuncForPC(pc)
+		if f == nil {
+			break
+		}
+		name = f.Name()
+
+		// testing.tRunner is the standard library function that calls
+		// tests. Subtests are called directly by tRunner, without going through
+		// the Test/Benchmark/Example function that contains the t.Run calls, so
+		// with subtests we should break when we hit tRunner, without adding it
+		// to the list of callers.
+		if name == "testing.tRunner" {
+			break
+		}
+
+		parts := strings.Split(file, "/")
+		file = parts[len(parts)-1]
+		if len(parts) > 1 {
+			dir := parts[len(parts)-2]
+			if (dir != "assert" && dir != "mock" && dir != "require") || file == "mock_test.go" {
+				callers = append(callers, fmt.Sprintf("%s:%d", file, line))
+			}
+		}
+
+		// Drop the package
+		segments := strings.Split(name, ".")
+		name = segments[len(segments)-1]
+		if isTest(name, "Test") ||
+			isTest(name, "Benchmark") ||
+			isTest(name, "Example") {
+			break
+		}
+	}
+
+	return callers
+}
+
+// Stolen from the `go test` tool.
+// isTest tells whether name looks like a test (or benchmark, according to prefix).
+// It is a Test (say) if there is a character after Test that is not a lower-case letter.
+// We don't want TesticularCancer.
+func isTest(name, prefix string) bool {
+	if !strings.HasPrefix(name, prefix) {
+		return false
+	}
+	if len(name) == len(prefix) { // "Test" is ok
+		return true
+	}
+	rune, _ := utf8.DecodeRuneInString(name[len(prefix):])
+	return !unicode.IsLower(rune)
+}
+
+func messageFromMsgAndArgs(msgAndArgs ...interface{}) string {
+	if len(msgAndArgs) == 0 || msgAndArgs == nil {
+		return ""
+	}
+	if len(msgAndArgs) == 1 {
+		msg := msgAndArgs[0]
+		if msgAsStr, ok := msg.(string); ok {
+			return msgAsStr
+		}
+		return fmt.Sprintf("%+v", msg)
+	}
+	if len(msgAndArgs) > 1 {
+		return fmt.Sprintf(msgAndArgs[0].(string), msgAndArgs[1:]...)
+	}
+	return ""
+}
+
+// Aligns the provided message so that all lines after the first line start at the same location as the first line.
+// Assumes that the first line starts at the correct location (after carriage return, tab, label, spacer and tab).
+// The longestLabelLen parameter specifies the length of the longest label in the output (required becaues this is the
+// basis on which the alignment occurs).
+func indentMessageLines(message string, longestLabelLen int) string {
+	outBuf := new(bytes.Buffer)
+
+	for i, scanner := 0, bufio.NewScanner(strings.NewReader(message)); scanner.Scan(); i++ {
+		// no need to align first line because it starts at the correct location (after the label)
+		if i != 0 {
+			// append alignLen+1 spaces to align with "{{longestLabel}}:" before adding tab
+			outBuf.WriteString("\n\t" + strings.Repeat(" ", longestLabelLen+1) + "\t")
+		}
+		outBuf.WriteString(scanner.Text())
+	}
+
+	return outBuf.String()
+}
+
+type failNower interface {
+	FailNow()
+}
+
+// FailNow fails test
+func FailNow(t TestingT, failureMessage string, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	Fail(t, failureMessage, msgAndArgs...)
+
+	// We cannot extend TestingT with FailNow() and
+	// maintain backwards compatibility, so we fallback
+	// to panicking when FailNow is not available in
+	// TestingT.
+	// See issue #263
+
+	if t, ok := t.(failNower); ok {
+		t.FailNow()
+	} else {
+		panic("test failed and t is missing `FailNow()`")
+	}
+	return false
+}
+
+// Fail reports a failure through
+func Fail(t TestingT, failureMessage string, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	content := []labeledContent{
+		{"Error Trace", strings.Join(CallerInfo(), "\n\t\t\t")},
+		{"Error", failureMessage},
+	}
+
+	// Add test name if the Go version supports it
+	if n, ok := t.(interface {
+		Name() string
+	}); ok {
+		content = append(content, labeledContent{"Test", n.Name()})
+	}
+
+	message := messageFromMsgAndArgs(msgAndArgs...)
+	if len(message) > 0 {
+		content = append(content, labeledContent{"Messages", message})
+	}
+
+	t.Errorf("\n%s", ""+labeledOutput(content...))
+
+	return false
+}
+
+type labeledContent struct {
+	label   string
+	content string
+}
+
+// labeledOutput returns a string consisting of the provided labeledContent. Each labeled output is appended in the following manner:
+//
+//   \t{{label}}:{{align_spaces}}\t{{content}}\n
+//
+// The initial carriage return is required to undo/erase any padding added by testing.T.Errorf. The "\t{{label}}:" is for the label.
+// If a label is shorter than the longest label provided, padding spaces are added to make all the labels match in length. Once this
+// alignment is achieved, "\t{{content}}\n" is added for the output.
+//
+// If the content of the labeledOutput contains line breaks, the subsequent lines are aligned so that they start at the same location as the first line.
+func labeledOutput(content ...labeledContent) string {
+	longestLabel := 0
+	for _, v := range content {
+		if len(v.label) > longestLabel {
+			longestLabel = len(v.label)
+		}
+	}
+	var output string
+	for _, v := range content {
+		output += "\t" + v.label + ":" + strings.Repeat(" ", longestLabel-len(v.label)) + "\t" + indentMessageLines(v.content, longestLabel) + "\n"
+	}
+	return output
+}
+
+// Implements asserts that an object is implemented by the specified interface.
+//
+//    assert.Implements(t, (*MyInterface)(nil), new(MyObject))
+func Implements(t TestingT, interfaceObject interface{}, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	interfaceType := reflect.TypeOf(interfaceObject).Elem()
+
+	if object == nil {
+		return Fail(t, fmt.Sprintf("Cannot check if nil implements %v", interfaceType), msgAndArgs...)
+	}
+	if !reflect.TypeOf(object).Implements(interfaceType) {
+		return Fail(t, fmt.Sprintf("%T must implement %v", object, interfaceType), msgAndArgs...)
+	}
+
+	return true
+}
+
+// IsType asserts that the specified objects are of the same type.
+func IsType(t TestingT, expectedType interface{}, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	if !ObjectsAreEqual(reflect.TypeOf(object), reflect.TypeOf(expectedType)) {
+		return Fail(t, fmt.Sprintf("Object expected to be of type %v, but was %v", reflect.TypeOf(expectedType), reflect.TypeOf(object)), msgAndArgs...)
+	}
+
+	return true
+}
+
+// Equal asserts that two objects are equal.
+//
+//    assert.Equal(t, 123, 123)
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses). Function equality
+// cannot be determined and will always fail.
+func Equal(t TestingT, expected, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if err := validateEqualArgs(expected, actual); err != nil {
+		return Fail(t, fmt.Sprintf("Invalid operation: %#v == %#v (%s)",
+			expected, actual, err), msgAndArgs...)
+	}
+
+	if !ObjectsAreEqual(expected, actual) {
+		diff := diff(expected, actual)
+		expected, actual = formatUnequalValues(expected, actual)
+		return Fail(t, fmt.Sprintf("Not equal: \n"+
+			"expected: %s\n"+
+			"actual  : %s%s", expected, actual, diff), msgAndArgs...)
+	}
+
+	return true
+
+}
+
+// formatUnequalValues takes two values of arbitrary types and returns string
+// representations appropriate to be presented to the user.
+//
+// If the values are not of like type, the returned strings will be prefixed
+// with the type name, and the value will be enclosed in parenthesis similar
+// to a type conversion in the Go grammar.
+func formatUnequalValues(expected, actual interface{}) (e string, a string) {
+	if reflect.TypeOf(expected) != reflect.TypeOf(actual) {
+		return fmt.Sprintf("%T(%#v)", expected, expected),
+			fmt.Sprintf("%T(%#v)", actual, actual)
+	}
+
+	return fmt.Sprintf("%#v", expected),
+		fmt.Sprintf("%#v", actual)
+}
+
+// EqualValues asserts that two objects are equal or convertable to the same types
+// and equal.
+//
+//    assert.EqualValues(t, uint32(123), int32(123))
+func EqualValues(t TestingT, expected, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	if !ObjectsAreEqualValues(expected, actual) {
+		diff := diff(expected, actual)
+		expected, actual = formatUnequalValues(expected, actual)
+		return Fail(t, fmt.Sprintf("Not equal: \n"+
+			"expected: %s\n"+
+			"actual  : %s%s", expected, actual, diff), msgAndArgs...)
+	}
+
+	return true
+
+}
+
+// Exactly asserts that two objects are equal in value and type.
+//
+//    assert.Exactly(t, int32(123), int64(123))
+func Exactly(t TestingT, expected, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	aType := reflect.TypeOf(expected)
+	bType := reflect.TypeOf(actual)
+
+	if aType != bType {
+		return Fail(t, fmt.Sprintf("Types expected to match exactly\n\t%v != %v", aType, bType), msgAndArgs...)
+	}
+
+	return Equal(t, expected, actual, msgAndArgs...)
+
+}
+
+// NotNil asserts that the specified object is not nil.
+//
+//    assert.NotNil(t, err)
+func NotNil(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if !isNil(object) {
+		return true
+	}
+	return Fail(t, "Expected value not to be nil.", msgAndArgs...)
+}
+
+// isNil checks if a specified object is nil or not, without Failing.
+func isNil(object interface{}) bool {
+	if object == nil {
+		return true
+	}
+
+	value := reflect.ValueOf(object)
+	kind := value.Kind()
+	if kind >= reflect.Chan && kind <= reflect.Slice && value.IsNil() {
+		return true
+	}
+
+	return false
+}
+
+// Nil asserts that the specified object is nil.
+//
+//    assert.Nil(t, err)
+func Nil(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if isNil(object) {
+		return true
+	}
+	return Fail(t, fmt.Sprintf("Expected nil, but got: %#v", object), msgAndArgs...)
+}
+
+// isEmpty gets whether the specified object is considered empty or not.
+func isEmpty(object interface{}) bool {
+
+	// get nil case out of the way
+	if object == nil {
+		return true
+	}
+
+	objValue := reflect.ValueOf(object)
+
+	switch objValue.Kind() {
+	// collection types are empty when they have no element
+	case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
+		return objValue.Len() == 0
+	// pointers are empty if nil or if the value they point to is empty
+	case reflect.Ptr:
+		if objValue.IsNil() {
+			return true
+		}
+		deref := objValue.Elem().Interface()
+		return isEmpty(deref)
+	// for all other types, compare against the zero value
+	default:
+		zero := reflect.Zero(objValue.Type())
+		return reflect.DeepEqual(object, zero.Interface())
+	}
+}
+
+// Empty asserts that the specified object is empty.  I.e. nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  assert.Empty(t, obj)
+func Empty(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	pass := isEmpty(object)
+	if !pass {
+		Fail(t, fmt.Sprintf("Should be empty, but was %v", object), msgAndArgs...)
+	}
+
+	return pass
+
+}
+
+// NotEmpty asserts that the specified object is NOT empty.  I.e. not nil, "", false, 0 or either
+// a slice or a channel with len == 0.
+//
+//  if assert.NotEmpty(t, obj) {
+//    assert.Equal(t, "two", obj[1])
+//  }
+func NotEmpty(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	pass := !isEmpty(object)
+	if !pass {
+		Fail(t, fmt.Sprintf("Should NOT be empty, but was %v", object), msgAndArgs...)
+	}
+
+	return pass
+
+}
+
+// getLen try to get length of object.
+// return (false, 0) if impossible.
+func getLen(x interface{}) (ok bool, length int) {
+	v := reflect.ValueOf(x)
+	defer func() {
+		if e := recover(); e != nil {
+			ok = false
+		}
+	}()
+	return true, v.Len()
+}
+
+// Len asserts that the specified object has specific length.
+// Len also fails if the object has a type that len() not accept.
+//
+//    assert.Len(t, mySlice, 3)
+func Len(t TestingT, object interface{}, length int, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	ok, l := getLen(object)
+	if !ok {
+		return Fail(t, fmt.Sprintf("\"%s\" could not be applied builtin len()", object), msgAndArgs...)
+	}
+
+	if l != length {
+		return Fail(t, fmt.Sprintf("\"%s\" should have %d item(s), but has %d", object, length, l), msgAndArgs...)
+	}
+	return true
+}
+
+// True asserts that the specified value is true.
+//
+//    assert.True(t, myBool)
+func True(t TestingT, value bool, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if h, ok := t.(interface {
+		Helper()
+	}); ok {
+		h.Helper()
+	}
+
+	if value != true {
+		return Fail(t, "Should be true", msgAndArgs...)
+	}
+
+	return true
+
+}
+
+// False asserts that the specified value is false.
+//
+//    assert.False(t, myBool)
+func False(t TestingT, value bool, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	if value != false {
+		return Fail(t, "Should be false", msgAndArgs...)
+	}
+
+	return true
+
+}
+
+// NotEqual asserts that the specified values are NOT equal.
+//
+//    assert.NotEqual(t, obj1, obj2)
+//
+// Pointer variable equality is determined based on the equality of the
+// referenced values (as opposed to the memory addresses).
+func NotEqual(t TestingT, expected, actual interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if err := validateEqualArgs(expected, actual); err != nil {
+		return Fail(t, fmt.Sprintf("Invalid operation: %#v != %#v (%s)",
+			expected, actual, err), msgAndArgs...)
+	}
+
+	if ObjectsAreEqual(expected, actual) {
+		return Fail(t, fmt.Sprintf("Should not be: %#v\n", actual), msgAndArgs...)
+	}
+
+	return true
+
+}
+
+// containsElement try loop over the list check if the list includes the element.
+// return (false, false) if impossible.
+// return (true, false) if element was not found.
+// return (true, true) if element was found.
+func includeElement(list interface{}, element interface{}) (ok, found bool) {
+
+	listValue := reflect.ValueOf(list)
+	elementValue := reflect.ValueOf(element)
+	defer func() {
+		if e := recover(); e != nil {
+			ok = false
+			found = false
+		}
+	}()
+
+	if reflect.TypeOf(list).Kind() == reflect.String {
+		return true, strings.Contains(listValue.String(), elementValue.String())
+	}
+
+	if reflect.TypeOf(list).Kind() == reflect.Map {
+		mapKeys := listValue.MapKeys()
+		for i := 0; i < len(mapKeys); i++ {
+			if ObjectsAreEqual(mapKeys[i].Interface(), element) {
+				return true, true
+			}
+		}
+		return true, false
+	}
+
+	for i := 0; i < listValue.Len(); i++ {
+		if ObjectsAreEqual(listValue.Index(i).Interface(), element) {
+			return true, true
+		}
+	}
+	return true, false
+
+}
+
+// Contains asserts that the specified string, list(array, slice...) or map contains the
+// specified substring or element.
+//
+//    assert.Contains(t, "Hello World", "World")
+//    assert.Contains(t, ["Hello", "World"], "World")
+//    assert.Contains(t, {"Hello": "World"}, "Hello")
+func Contains(t TestingT, s, contains interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	ok, found := includeElement(s, contains)
+	if !ok {
+		return Fail(t, fmt.Sprintf("\"%s\" could not be applied builtin len()", s), msgAndArgs...)
+	}
+	if !found {
+		return Fail(t, fmt.Sprintf("\"%s\" does not contain \"%s\"", s, contains), msgAndArgs...)
+	}
+
+	return true
+
+}
+
+// NotContains asserts that the specified string, list(array, slice...) or map does NOT contain the
+// specified substring or element.
+//
+//    assert.NotContains(t, "Hello World", "Earth")
+//    assert.NotContains(t, ["Hello", "World"], "Earth")
+//    assert.NotContains(t, {"Hello": "World"}, "Earth")
+func NotContains(t TestingT, s, contains interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	ok, found := includeElement(s, contains)
+	if !ok {
+		return Fail(t, fmt.Sprintf("\"%s\" could not be applied builtin len()", s), msgAndArgs...)
+	}
+	if found {
+		return Fail(t, fmt.Sprintf("\"%s\" should not contain \"%s\"", s, contains), msgAndArgs...)
+	}
+
+	return true
+
+}
+
+// Subset asserts that the specified list(array, slice...) contains all
+// elements given in the specified subset(array, slice...).
+//
+//    assert.Subset(t, [1, 2, 3], [1, 2], "But [1, 2, 3] does contain [1, 2]")
+func Subset(t TestingT, list, subset interface{}, msgAndArgs ...interface{}) (ok bool) {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if subset == nil {
+		return true // we consider nil to be equal to the nil set
+	}
+
+	subsetValue := reflect.ValueOf(subset)
+	defer func() {
+		if e := recover(); e != nil {
+			ok = false
+		}
+	}()
+
+	listKind := reflect.TypeOf(list).Kind()
+	subsetKind := reflect.TypeOf(subset).Kind()
+
+	if listKind != reflect.Array && listKind != reflect.Slice {
+		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", list, listKind), msgAndArgs...)
+	}
+
+	if subsetKind != reflect.Array && subsetKind != reflect.Slice {
+		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", subset, subsetKind), msgAndArgs...)
+	}
+
+	for i := 0; i < subsetValue.Len(); i++ {
+		element := subsetValue.Index(i).Interface()
+		ok, found := includeElement(list, element)
+		if !ok {
+			return Fail(t, fmt.Sprintf("\"%s\" could not be applied builtin len()", list), msgAndArgs...)
+		}
+		if !found {
+			return Fail(t, fmt.Sprintf("\"%s\" does not contain \"%s\"", list, element), msgAndArgs...)
+		}
+	}
+
+	return true
+}
+
+// NotSubset asserts that the specified list(array, slice...) contains not all
+// elements given in the specified subset(array, slice...).
+//
+//    assert.NotSubset(t, [1, 3, 4], [1, 2], "But [1, 3, 4] does not contain [1, 2]")
+func NotSubset(t TestingT, list, subset interface{}, msgAndArgs ...interface{}) (ok bool) {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if subset == nil {
+		return Fail(t, fmt.Sprintf("nil is the empty set which is a subset of every set"), msgAndArgs...)
+	}
+
+	subsetValue := reflect.ValueOf(subset)
+	defer func() {
+		if e := recover(); e != nil {
+			ok = false
+		}
+	}()
+
+	listKind := reflect.TypeOf(list).Kind()
+	subsetKind := reflect.TypeOf(subset).Kind()
+
+	if listKind != reflect.Array && listKind != reflect.Slice {
+		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", list, listKind), msgAndArgs...)
+	}
+
+	if subsetKind != reflect.Array && subsetKind != reflect.Slice {
+		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", subset, subsetKind), msgAndArgs...)
+	}
+
+	for i := 0; i < subsetValue.Len(); i++ {
+		element := subsetValue.Index(i).Interface()
+		ok, found := includeElement(list, element)
+		if !ok {
+			return Fail(t, fmt.Sprintf("\"%s\" could not be applied builtin len()", list), msgAndArgs...)
+		}
+		if !found {
+			return true
+		}
+	}
+
+	return Fail(t, fmt.Sprintf("%q is a subset of %q", subset, list), msgAndArgs...)
+}
+
+// ElementsMatch asserts that the specified listA(array, slice...) is equal to specified
+// listB(array, slice...) ignoring the order of the elements. If there are duplicate elements,
+// the number of appearances of each of them in both lists should match.
+//
+// assert.ElementsMatch(t, [1, 3, 2, 3], [1, 3, 3, 2])
+func ElementsMatch(t TestingT, listA, listB interface{}, msgAndArgs ...interface{}) (ok bool) {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if isEmpty(listA) && isEmpty(listB) {
+		return true
+	}
+
+	aKind := reflect.TypeOf(listA).Kind()
+	bKind := reflect.TypeOf(listB).Kind()
+
+	if aKind != reflect.Array && aKind != reflect.Slice {
+		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", listA, aKind), msgAndArgs...)
+	}
+
+	if bKind != reflect.Array && bKind != reflect.Slice {
+		return Fail(t, fmt.Sprintf("%q has an unsupported type %s", listB, bKind), msgAndArgs...)
+	}
+
+	aValue := reflect.ValueOf(listA)
+	bValue := reflect.ValueOf(listB)
+
+	aLen := aValue.Len()
+	bLen := bValue.Len()
+
+	if aLen != bLen {
+		return Fail(t, fmt.Sprintf("lengths don't match: %d != %d", aLen, bLen), msgAndArgs...)
+	}
+
+	// Mark indexes in bValue that we already used
+	visited := make([]bool, bLen)
+	for i := 0; i < aLen; i++ {
+		element := aValue.Index(i).Interface()
+		found := false
+		for j := 0; j < bLen; j++ {
+			if visited[j] {
+				continue
+			}
+			if ObjectsAreEqual(bValue.Index(j).Interface(), element) {
+				visited[j] = true
+				found = true
+				break
+			}
+		}
+		if !found {
+			return Fail(t, fmt.Sprintf("element %s appears more times in %s than in %s", element, aValue, bValue), msgAndArgs...)
+		}
+	}
+
+	return true
+}
+
+// Condition uses a Comparison to assert a complex condition.
+func Condition(t TestingT, comp Comparison, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	result := comp()
+	if !result {
+		Fail(t, "Condition failed!", msgAndArgs...)
+	}
+	return result
+}
+
+// PanicTestFunc defines a func that should be passed to the assert.Panics and assert.NotPanics
+// methods, and represents a simple func that takes no arguments, and returns nothing.
+type PanicTestFunc func()
+
+// didPanic returns true if the function passed to it panics. Otherwise, it returns false.
+func didPanic(f PanicTestFunc) (bool, interface{}) {
+
+	didPanic := false
+	var message interface{}
+	func() {
+
+		defer func() {
+			if message = recover(); message != nil {
+				didPanic = true
+			}
+		}()
+
+		// call the target function
+		f()
+
+	}()
+
+	return didPanic, message
+
+}
+
+// Panics asserts that the code inside the specified PanicTestFunc panics.
+//
+//   assert.Panics(t, func(){ GoCrazy() })
+func Panics(t TestingT, f PanicTestFunc, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	if funcDidPanic, panicValue := didPanic(f); !funcDidPanic {
+		return Fail(t, fmt.Sprintf("func %#v should panic\n\tPanic value:\t%#v", f, panicValue), msgAndArgs...)
+	}
+
+	return true
+}
+
+// PanicsWithValue asserts that the code inside the specified PanicTestFunc panics, and that
+// the recovered panic value equals the expected panic value.
+//
+//   assert.PanicsWithValue(t, "crazy error", func(){ GoCrazy() })
+func PanicsWithValue(t TestingT, expected interface{}, f PanicTestFunc, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	funcDidPanic, panicValue := didPanic(f)
+	if !funcDidPanic {
+		return Fail(t, fmt.Sprintf("func %#v should panic\n\tPanic value:\t%#v", f, panicValue), msgAndArgs...)
+	}
+	if panicValue != expected {
+		return Fail(t, fmt.Sprintf("func %#v should panic with value:\t%#v\n\tPanic value:\t%#v", f, expected, panicValue), msgAndArgs...)
+	}
+
+	return true
+}
+
+// NotPanics asserts that the code inside the specified PanicTestFunc does NOT panic.
+//
+//   assert.NotPanics(t, func(){ RemainCalm() })
+func NotPanics(t TestingT, f PanicTestFunc, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	if funcDidPanic, panicValue := didPanic(f); funcDidPanic {
+		return Fail(t, fmt.Sprintf("func %#v should not panic\n\tPanic value:\t%v", f, panicValue), msgAndArgs...)
+	}
+
+	return true
+}
+
+// WithinDuration asserts that the two times are within duration delta of each other.
+//
+//   assert.WithinDuration(t, time.Now(), time.Now(), 10*time.Second)
+func WithinDuration(t TestingT, expected, actual time.Time, delta time.Duration, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	dt := expected.Sub(actual)
+	if dt < -delta || dt > delta {
+		return Fail(t, fmt.Sprintf("Max difference between %v and %v allowed is %v, but difference was %v", expected, actual, delta, dt), msgAndArgs...)
+	}
+
+	return true
+}
+
+func toFloat(x interface{}) (float64, bool) {
+	var xf float64
+	xok := true
+
+	switch xn := x.(type) {
+	case uint8:
+		xf = float64(xn)
+	case uint16:
+		xf = float64(xn)
+	case uint32:
+		xf = float64(xn)
+	case uint64:
+		xf = float64(xn)
+	case int:
+		xf = float64(xn)
+	case int8:
+		xf = float64(xn)
+	case int16:
+		xf = float64(xn)
+	case int32:
+		xf = float64(xn)
+	case int64:
+		xf = float64(xn)
+	case float32:
+		xf = float64(xn)
+	case float64:
+		xf = float64(xn)
+	case time.Duration:
+		xf = float64(xn)
+	default:
+		xok = false
+	}
+
+	return xf, xok
+}
+
+// InDelta asserts that the two numerals are within delta of each other.
+//
+// 	 assert.InDelta(t, math.Pi, (22 / 7.0), 0.01)
+func InDelta(t TestingT, expected, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	af, aok := toFloat(expected)
+	bf, bok := toFloat(actual)
+
+	if !aok || !bok {
+		return Fail(t, fmt.Sprintf("Parameters must be numerical"), msgAndArgs...)
+	}
+
+	if math.IsNaN(af) {
+		return Fail(t, fmt.Sprintf("Expected must not be NaN"), msgAndArgs...)
+	}
+
+	if math.IsNaN(bf) {
+		return Fail(t, fmt.Sprintf("Expected %v with delta %v, but was NaN", expected, delta), msgAndArgs...)
+	}
+
+	dt := af - bf
+	if dt < -delta || dt > delta {
+		return Fail(t, fmt.Sprintf("Max difference between %v and %v allowed is %v, but difference was %v", expected, actual, delta, dt), msgAndArgs...)
+	}
+
+	return true
+}
+
+// InDeltaSlice is the same as InDelta, except it compares two slices.
+func InDeltaSlice(t TestingT, expected, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if expected == nil || actual == nil ||
+		reflect.TypeOf(actual).Kind() != reflect.Slice ||
+		reflect.TypeOf(expected).Kind() != reflect.Slice {
+		return Fail(t, fmt.Sprintf("Parameters must be slice"), msgAndArgs...)
+	}
+
+	actualSlice := reflect.ValueOf(actual)
+	expectedSlice := reflect.ValueOf(expected)
+
+	for i := 0; i < actualSlice.Len(); i++ {
+		result := InDelta(t, actualSlice.Index(i).Interface(), expectedSlice.Index(i).Interface(), delta, msgAndArgs...)
+		if !result {
+			return result
+		}
+	}
+
+	return true
+}
+
+// InDeltaMapValues is the same as InDelta, but it compares all values between two maps. Both maps must have exactly the same keys.
+func InDeltaMapValues(t TestingT, expected, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if expected == nil || actual == nil ||
+		reflect.TypeOf(actual).Kind() != reflect.Map ||
+		reflect.TypeOf(expected).Kind() != reflect.Map {
+		return Fail(t, "Arguments must be maps", msgAndArgs...)
+	}
+
+	expectedMap := reflect.ValueOf(expected)
+	actualMap := reflect.ValueOf(actual)
+
+	if expectedMap.Len() != actualMap.Len() {
+		return Fail(t, "Arguments must have the same number of keys", msgAndArgs...)
+	}
+
+	for _, k := range expectedMap.MapKeys() {
+		ev := expectedMap.MapIndex(k)
+		av := actualMap.MapIndex(k)
+
+		if !ev.IsValid() {
+			return Fail(t, fmt.Sprintf("missing key %q in expected map", k), msgAndArgs...)
+		}
+
+		if !av.IsValid() {
+			return Fail(t, fmt.Sprintf("missing key %q in actual map", k), msgAndArgs...)
+		}
+
+		if !InDelta(
+			t,
+			ev.Interface(),
+			av.Interface(),
+			delta,
+			msgAndArgs...,
+		) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func calcRelativeError(expected, actual interface{}) (float64, error) {
+	af, aok := toFloat(expected)
+	if !aok {
+		return 0, fmt.Errorf("expected value %q cannot be converted to float", expected)
+	}
+	if af == 0 {
+		return 0, fmt.Errorf("expected value must have a value other than zero to calculate the relative error")
+	}
+	bf, bok := toFloat(actual)
+	if !bok {
+		return 0, fmt.Errorf("actual value %q cannot be converted to float", actual)
+	}
+
+	return math.Abs(af-bf) / math.Abs(af), nil
+}
+
+// InEpsilon asserts that expected and actual have a relative error less than epsilon
+func InEpsilon(t TestingT, expected, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	actualEpsilon, err := calcRelativeError(expected, actual)
+	if err != nil {
+		return Fail(t, err.Error(), msgAndArgs...)
+	}
+	if actualEpsilon > epsilon {
+		return Fail(t, fmt.Sprintf("Relative error is too high: %#v (expected)\n"+
+			"        < %#v (actual)", epsilon, actualEpsilon), msgAndArgs...)
+	}
+
+	return true
+}
+
+// InEpsilonSlice is the same as InEpsilon, except it compares each value from two slices.
+func InEpsilonSlice(t TestingT, expected, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if expected == nil || actual == nil ||
+		reflect.TypeOf(actual).Kind() != reflect.Slice ||
+		reflect.TypeOf(expected).Kind() != reflect.Slice {
+		return Fail(t, fmt.Sprintf("Parameters must be slice"), msgAndArgs...)
+	}
+
+	actualSlice := reflect.ValueOf(actual)
+	expectedSlice := reflect.ValueOf(expected)
+
+	for i := 0; i < actualSlice.Len(); i++ {
+		result := InEpsilon(t, actualSlice.Index(i).Interface(), expectedSlice.Index(i).Interface(), epsilon)
+		if !result {
+			return result
+		}
+	}
+
+	return true
+}
+
+/*
+	Errors
+*/
+
+// NoError asserts that a function returned no error (i.e. `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if assert.NoError(t, err) {
+//	   assert.Equal(t, expectedObj, actualObj)
+//   }
+func NoError(t TestingT, err error, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if err != nil {
+		return Fail(t, fmt.Sprintf("Received unexpected error:\n%+v", err), msgAndArgs...)
+	}
+
+	return true
+}
+
+// Error asserts that a function returned an error (i.e. not `nil`).
+//
+//   actualObj, err := SomeFunction()
+//   if assert.Error(t, err) {
+//	   assert.Equal(t, expectedError, err)
+//   }
+func Error(t TestingT, err error, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	if err == nil {
+		return Fail(t, "An error is expected but got nil.", msgAndArgs...)
+	}
+
+	return true
+}
+
+// EqualError asserts that a function returned an error (i.e. not `nil`)
+// and that it is equal to the provided error.
+//
+//   actualObj, err := SomeFunction()
+//   assert.EqualError(t, err,  expectedErrorString)
+func EqualError(t TestingT, theError error, errString string, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if !Error(t, theError, msgAndArgs...) {
+		return false
+	}
+	expected := errString
+	actual := theError.Error()
+	// don't need to use deep equals here, we know they are both strings
+	if expected != actual {
+		return Fail(t, fmt.Sprintf("Error message not equal:\n"+
+			"expected: %q\n"+
+			"actual  : %q", expected, actual), msgAndArgs...)
+	}
+	return true
+}
+
+// matchRegexp return true if a specified regexp matches a string.
+func matchRegexp(rx interface{}, str interface{}) bool {
+
+	var r *regexp.Regexp
+	if rr, ok := rx.(*regexp.Regexp); ok {
+		r = rr
+	} else {
+		r = regexp.MustCompile(fmt.Sprint(rx))
+	}
+
+	return (r.FindStringIndex(fmt.Sprint(str)) != nil)
+
+}
+
+// Regexp asserts that a specified regexp matches a string.
+//
+//  assert.Regexp(t, regexp.MustCompile("start"), "it's starting")
+//  assert.Regexp(t, "start...$", "it's not starting")
+func Regexp(t TestingT, rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	match := matchRegexp(rx, str)
+
+	if !match {
+		Fail(t, fmt.Sprintf("Expect \"%v\" to match \"%v\"", str, rx), msgAndArgs...)
+	}
+
+	return match
+}
+
+// NotRegexp asserts that a specified regexp does not match a string.
+//
+//  assert.NotRegexp(t, regexp.MustCompile("starts"), "it's starting")
+//  assert.NotRegexp(t, "^start", "it's not starting")
+func NotRegexp(t TestingT, rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	match := matchRegexp(rx, str)
+
+	if match {
+		Fail(t, fmt.Sprintf("Expect \"%v\" to NOT match \"%v\"", str, rx), msgAndArgs...)
+	}
+
+	return !match
+
+}
+
+// Zero asserts that i is the zero value for its type.
+func Zero(t TestingT, i interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if i != nil && !reflect.DeepEqual(i, reflect.Zero(reflect.TypeOf(i)).Interface()) {
+		return Fail(t, fmt.Sprintf("Should be zero, but was %v", i), msgAndArgs...)
+	}
+	return true
+}
+
+// NotZero asserts that i is not the zero value for its type.
+func NotZero(t TestingT, i interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	if i == nil || reflect.DeepEqual(i, reflect.Zero(reflect.TypeOf(i)).Interface()) {
+		return Fail(t, fmt.Sprintf("Should not be zero, but was %v", i), msgAndArgs...)
+	}
+	return true
+}
+
+// FileExists checks whether a file exists in the given path. It also fails if the path points to a directory or there is an error when trying to check the file.
+func FileExists(t TestingT, path string, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	info, err := os.Lstat(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return Fail(t, fmt.Sprintf("unable to find file %q", path), msgAndArgs...)
+		}
+		return Fail(t, fmt.Sprintf("error when running os.Lstat(%q): %s", path, err), msgAndArgs...)
+	}
+	if info.IsDir() {
+		return Fail(t, fmt.Sprintf("%q is a directory", path), msgAndArgs...)
+	}
+	return true
+}
+
+// DirExists checks whether a directory exists in the given path. It also fails if the path is a file rather a directory or there is an error checking whether it exists.
+func DirExists(t TestingT, path string, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	info, err := os.Lstat(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return Fail(t, fmt.Sprintf("unable to find file %q", path), msgAndArgs...)
+		}
+		return Fail(t, fmt.Sprintf("error when running os.Lstat(%q): %s", path, err), msgAndArgs...)
+	}
+	if !info.IsDir() {
+		return Fail(t, fmt.Sprintf("%q is a file", path), msgAndArgs...)
+	}
+	return true
+}
+
+// JSONEq asserts that two JSON strings are equivalent.
+//
+//  assert.JSONEq(t, `{"hello": "world", "foo": "bar"}`, `{"foo": "bar", "hello": "world"}`)
+func JSONEq(t TestingT, expected string, actual string, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	var expectedJSONAsInterface, actualJSONAsInterface interface{}
+
+	if err := json.Unmarshal([]byte(expected), &expectedJSONAsInterface); err != nil {
+		return Fail(t, fmt.Sprintf("Expected value ('%s') is not valid json.\nJSON parsing error: '%s'", expected, err.Error()), msgAndArgs...)
+	}
+
+	if err := json.Unmarshal([]byte(actual), &actualJSONAsInterface); err != nil {
+		return Fail(t, fmt.Sprintf("Input ('%s') needs to be valid json.\nJSON parsing error: '%s'", actual, err.Error()), msgAndArgs...)
+	}
+
+	return Equal(t, expectedJSONAsInterface, actualJSONAsInterface, msgAndArgs...)
+}
+
+func typeAndKind(v interface{}) (reflect.Type, reflect.Kind) {
+	t := reflect.TypeOf(v)
+	k := t.Kind()
+
+	if k == reflect.Ptr {
+		t = t.Elem()
+		k = t.Kind()
+	}
+	return t, k
+}
+
+// diff returns a diff of both values as long as both are of the same type and
+// are a struct, map, slice, array or string. Otherwise it returns an empty string.
+func diff(expected interface{}, actual interface{}) string {
+	if expected == nil || actual == nil {
+		return ""
+	}
+
+	et, ek := typeAndKind(expected)
+	at, _ := typeAndKind(actual)
+
+	if et != at {
+		return ""
+	}
+
+	if ek != reflect.Struct && ek != reflect.Map && ek != reflect.Slice && ek != reflect.Array && ek != reflect.String {
+		return ""
+	}
+
+	var e, a string
+	if et != reflect.TypeOf("") {
+		e = spewConfig.Sdump(expected)
+		a = spewConfig.Sdump(actual)
+	} else {
+		e = expected.(string)
+		a = actual.(string)
+	}
+
+	diff, _ := difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
+		A:        difflib.SplitLines(e),
+		B:        difflib.SplitLines(a),
+		FromFile: "Expected",
+		FromDate: "",
+		ToFile:   "Actual",
+		ToDate:   "",
+		Context:  1,
+	})
+
+	return "\n\nDiff:\n" + diff
+}
+
+// validateEqualArgs checks whether provided arguments can be safely used in the
+// Equal/NotEqual functions.
+func validateEqualArgs(expected, actual interface{}) error {
+	if isFunction(expected) || isFunction(actual) {
+		return errors.New("cannot take func type as argument")
+	}
+	return nil
+}
+
+func isFunction(arg interface{}) bool {
+	if arg == nil {
+		return false
+	}
+	return reflect.TypeOf(arg).Kind() == reflect.Func
+}
+
+var spewConfig = spew.ConfigState{
+	Indent:                  " ",
+	DisablePointerAddresses: true,
+	DisableCapacities:       true,
+	SortKeys:                true,
+}
+
+type tHelper interface {
+	Helper()
+}
diff --git a/go/vendor/github.com/stretchr/testify/assert/doc.go b/go/vendor/github.com/stretchr/testify/assert/doc.go
new file mode 100644
index 0000000..c9dccc4
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/doc.go
@@ -0,0 +1,45 @@
+// Package assert provides a set of comprehensive testing tools for use with the normal Go testing system.
+//
+// Example Usage
+//
+// The following is a complete example using assert in a standard test function:
+//    import (
+//      "testing"
+//      "github.com/stretchr/testify/assert"
+//    )
+//
+//    func TestSomething(t *testing.T) {
+//
+//      var a string = "Hello"
+//      var b string = "Hello"
+//
+//      assert.Equal(t, a, b, "The two words should be the same.")
+//
+//    }
+//
+// if you assert many times, use the format below:
+//
+//    import (
+//      "testing"
+//      "github.com/stretchr/testify/assert"
+//    )
+//
+//    func TestSomething(t *testing.T) {
+//      assert := assert.New(t)
+//
+//      var a string = "Hello"
+//      var b string = "Hello"
+//
+//      assert.Equal(a, b, "The two words should be the same.")
+//    }
+//
+// Assertions
+//
+// Assertions allow you to easily write test code, and are global funcs in the `assert` package.
+// All assertion functions take, as the first argument, the `*testing.T` object provided by the
+// testing framework. This allows the assertion funcs to write the failings and other details to
+// the correct place.
+//
+// Every assertion function also takes an optional string message as the final argument,
+// allowing custom error messages to be appended to the message the assertion method outputs.
+package assert
diff --git a/go/vendor/github.com/stretchr/testify/assert/errors.go b/go/vendor/github.com/stretchr/testify/assert/errors.go
new file mode 100644
index 0000000..ac9dc9d
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/errors.go
@@ -0,0 +1,10 @@
+package assert
+
+import (
+	"errors"
+)
+
+// AnError is an error instance useful for testing.  If the code does not care
+// about error specifics, and only needs to return the error for example, this
+// error should be used to make the test code more readable.
+var AnError = errors.New("assert.AnError general error for testing")
diff --git a/go/vendor/github.com/stretchr/testify/assert/forward_assertions.go b/go/vendor/github.com/stretchr/testify/assert/forward_assertions.go
new file mode 100644
index 0000000..9ad5685
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/forward_assertions.go
@@ -0,0 +1,16 @@
+package assert
+
+// Assertions provides assertion methods around the
+// TestingT interface.
+type Assertions struct {
+	t TestingT
+}
+
+// New makes a new Assertions object for the specified TestingT.
+func New(t TestingT) *Assertions {
+	return &Assertions{
+		t: t,
+	}
+}
+
+//go:generate go run ../_codegen/main.go -output-package=assert -template=assertion_forward.go.tmpl -include-format-funcs
diff --git a/go/vendor/github.com/stretchr/testify/assert/http_assertions.go b/go/vendor/github.com/stretchr/testify/assert/http_assertions.go
new file mode 100644
index 0000000..df46fa7
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/assert/http_assertions.go
@@ -0,0 +1,143 @@
+package assert
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+)
+
+// httpCode is a helper that returns HTTP code of the response. It returns -1 and
+// an error if building a new request fails.
+func httpCode(handler http.HandlerFunc, method, url string, values url.Values) (int, error) {
+	w := httptest.NewRecorder()
+	req, err := http.NewRequest(method, url, nil)
+	if err != nil {
+		return -1, err
+	}
+	req.URL.RawQuery = values.Encode()
+	handler(w, req)
+	return w.Code, nil
+}
+
+// HTTPSuccess asserts that a specified handler returns a success status code.
+//
+//  assert.HTTPSuccess(t, myHandler, "POST", "http://www.google.com", nil)
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPSuccess(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	code, err := httpCode(handler, method, url, values)
+	if err != nil {
+		Fail(t, fmt.Sprintf("Failed to build test request, got error: %s", err))
+		return false
+	}
+
+	isSuccessCode := code >= http.StatusOK && code <= http.StatusPartialContent
+	if !isSuccessCode {
+		Fail(t, fmt.Sprintf("Expected HTTP success status code for %q but received %d", url+"?"+values.Encode(), code))
+	}
+
+	return isSuccessCode
+}
+
+// HTTPRedirect asserts that a specified handler returns a redirect status code.
+//
+//  assert.HTTPRedirect(t, myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPRedirect(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	code, err := httpCode(handler, method, url, values)
+	if err != nil {
+		Fail(t, fmt.Sprintf("Failed to build test request, got error: %s", err))
+		return false
+	}
+
+	isRedirectCode := code >= http.StatusMultipleChoices && code <= http.StatusTemporaryRedirect
+	if !isRedirectCode {
+		Fail(t, fmt.Sprintf("Expected HTTP redirect status code for %q but received %d", url+"?"+values.Encode(), code))
+	}
+
+	return isRedirectCode
+}
+
+// HTTPError asserts that a specified handler returns an error status code.
+//
+//  assert.HTTPError(t, myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPError(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	code, err := httpCode(handler, method, url, values)
+	if err != nil {
+		Fail(t, fmt.Sprintf("Failed to build test request, got error: %s", err))
+		return false
+	}
+
+	isErrorCode := code >= http.StatusBadRequest
+	if !isErrorCode {
+		Fail(t, fmt.Sprintf("Expected HTTP error status code for %q but received %d", url+"?"+values.Encode(), code))
+	}
+
+	return isErrorCode
+}
+
+// HTTPBody is a helper that returns HTTP body of the response. It returns
+// empty string if building a new request fails.
+func HTTPBody(handler http.HandlerFunc, method, url string, values url.Values) string {
+	w := httptest.NewRecorder()
+	req, err := http.NewRequest(method, url+"?"+values.Encode(), nil)
+	if err != nil {
+		return ""
+	}
+	handler(w, req)
+	return w.Body.String()
+}
+
+// HTTPBodyContains asserts that a specified handler returns a
+// body that contains a string.
+//
+//  assert.HTTPBodyContains(t, myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	body := HTTPBody(handler, method, url, values)
+
+	contains := strings.Contains(body, fmt.Sprint(str))
+	if !contains {
+		Fail(t, fmt.Sprintf("Expected response body for \"%s\" to contain \"%s\" but found \"%s\"", url+"?"+values.Encode(), str, body))
+	}
+
+	return contains
+}
+
+// HTTPBodyNotContains asserts that a specified handler returns a
+// body that does not contain a string.
+//
+//  assert.HTTPBodyNotContains(t, myHandler, "GET", "www.google.com", nil, "I'm Feeling Lucky")
+//
+// Returns whether the assertion was successful (true) or not (false).
+func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	body := HTTPBody(handler, method, url, values)
+
+	contains := strings.Contains(body, fmt.Sprint(str))
+	if contains {
+		Fail(t, fmt.Sprintf("Expected response body for \"%s\" to NOT contain \"%s\" but found \"%s\"", url+"?"+values.Encode(), str, body))
+	}
+
+	return !contains
+}
diff --git a/go/vendor/github.com/stretchr/testify/doc.go b/go/vendor/github.com/stretchr/testify/doc.go
new file mode 100644
index 0000000..377d5cc
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/doc.go
@@ -0,0 +1,22 @@
+// Package testify is a set of packages that provide many tools for testifying that your code will behave as you intend.
+//
+// testify contains the following packages:
+//
+// The assert package provides a comprehensive set of assertion functions that tie in to the Go testing system.
+//
+// The http package contains tools to make it easier to test http activity using the Go testing system.
+//
+// The mock package provides a system by which it is possible to mock your objects and verify calls are happening as expected.
+//
+// The suite package provides a basic structure for using structs as testing suites, and methods on those structs as tests.  It includes setup/teardown functionality in the way of interfaces.
+package testify
+
+// blank imports help docs.
+import (
+	// assert package
+	_ "github.com/stretchr/testify/assert"
+	// http package
+	_ "github.com/stretchr/testify/http"
+	// mock package
+	_ "github.com/stretchr/testify/mock"
+)
diff --git a/go/vendor/github.com/stretchr/testify/go.mod b/go/vendor/github.com/stretchr/testify/go.mod
new file mode 100644
index 0000000..90e5dbe
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/go.mod
@@ -0,0 +1,7 @@
+module github.com/stretchr/testify
+
+require (
+	github.com/davecgh/go-spew v1.1.0
+	github.com/pmezard/go-difflib v1.0.0
+	github.com/stretchr/objx v0.1.0
+)
diff --git a/go/vendor/github.com/stretchr/testify/go.sum b/go/vendor/github.com/stretchr/testify/go.sum
new file mode 100644
index 0000000..5b98bf3
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/go.sum
@@ -0,0 +1,6 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
diff --git a/go/vendor/github.com/stretchr/testify/http/doc.go b/go/vendor/github.com/stretchr/testify/http/doc.go
new file mode 100644
index 0000000..695167c
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/http/doc.go
@@ -0,0 +1,2 @@
+// Package http DEPRECATED USE net/http/httptest
+package http
diff --git a/go/vendor/github.com/stretchr/testify/http/test_response_writer.go b/go/vendor/github.com/stretchr/testify/http/test_response_writer.go
new file mode 100644
index 0000000..5c3f813
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/http/test_response_writer.go
@@ -0,0 +1,49 @@
+package http
+
+import (
+	"net/http"
+)
+
+// TestResponseWriter DEPRECATED: We recommend you use http://golang.org/pkg/net/http/httptest instead.
+type TestResponseWriter struct {
+
+	// StatusCode is the last int written by the call to WriteHeader(int)
+	StatusCode int
+
+	// Output is a string containing the written bytes using the Write([]byte) func.
+	Output string
+
+	// header is the internal storage of the http.Header object
+	header http.Header
+}
+
+// Header DEPRECATED: We recommend you use http://golang.org/pkg/net/http/httptest instead.
+func (rw *TestResponseWriter) Header() http.Header {
+
+	if rw.header == nil {
+		rw.header = make(http.Header)
+	}
+
+	return rw.header
+}
+
+// Write DEPRECATED: We recommend you use http://golang.org/pkg/net/http/httptest instead.
+func (rw *TestResponseWriter) Write(bytes []byte) (int, error) {
+
+	// assume 200 success if no header has been set
+	if rw.StatusCode == 0 {
+		rw.WriteHeader(200)
+	}
+
+	// add these bytes to the output string
+	rw.Output = rw.Output + string(bytes)
+
+	// return normal values
+	return 0, nil
+
+}
+
+// WriteHeader DEPRECATED: We recommend you use http://golang.org/pkg/net/http/httptest instead.
+func (rw *TestResponseWriter) WriteHeader(i int) {
+	rw.StatusCode = i
+}
diff --git a/go/vendor/github.com/stretchr/testify/http/test_round_tripper.go b/go/vendor/github.com/stretchr/testify/http/test_round_tripper.go
new file mode 100644
index 0000000..b1e32f1
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/http/test_round_tripper.go
@@ -0,0 +1,17 @@
+package http
+
+import (
+	"github.com/stretchr/testify/mock"
+	"net/http"
+)
+
+// TestRoundTripper DEPRECATED USE net/http/httptest
+type TestRoundTripper struct {
+	mock.Mock
+}
+
+// RoundTrip DEPRECATED USE net/http/httptest
+func (t *TestRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	args := t.Called(req)
+	return args.Get(0).(*http.Response), args.Error(1)
+}
diff --git a/go/vendor/github.com/stretchr/testify/mock/doc.go b/go/vendor/github.com/stretchr/testify/mock/doc.go
new file mode 100644
index 0000000..7324128
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/mock/doc.go
@@ -0,0 +1,44 @@
+// Package mock provides a system by which it is possible to mock your objects
+// and verify calls are happening as expected.
+//
+// Example Usage
+//
+// The mock package provides an object, Mock, that tracks activity on another object.  It is usually
+// embedded into a test object as shown below:
+//
+//   type MyTestObject struct {
+//     // add a Mock object instance
+//     mock.Mock
+//
+//     // other fields go here as normal
+//   }
+//
+// When implementing the methods of an interface, you wire your functions up
+// to call the Mock.Called(args...) method, and return the appropriate values.
+//
+// For example, to mock a method that saves the name and age of a person and returns
+// the year of their birth or an error, you might write this:
+//
+//     func (o *MyTestObject) SavePersonDetails(firstname, lastname string, age int) (int, error) {
+//       args := o.Called(firstname, lastname, age)
+//       return args.Int(0), args.Error(1)
+//     }
+//
+// The Int, Error and Bool methods are examples of strongly typed getters that take the argument
+// index position. Given this argument list:
+//
+//     (12, true, "Something")
+//
+// You could read them out strongly typed like this:
+//
+//     args.Int(0)
+//     args.Bool(1)
+//     args.String(2)
+//
+// For objects of your own type, use the generic Arguments.Get(index) method and make a type assertion:
+//
+//     return args.Get(0).(*MyObject), args.Get(1).(*AnotherObjectOfMine)
+//
+// This may cause a panic if the object you are getting is nil (the type assertion will fail), in those
+// cases you should check for nil first.
+package mock
diff --git a/go/vendor/github.com/stretchr/testify/mock/mock.go b/go/vendor/github.com/stretchr/testify/mock/mock.go
new file mode 100644
index 0000000..cc4f642
--- /dev/null
+++ b/go/vendor/github.com/stretchr/testify/mock/mock.go
@@ -0,0 +1,885 @@
+package mock
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"regexp"
+	"runtime"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/pmezard/go-difflib/difflib"
+	"github.com/stretchr/objx"
+	"github.com/stretchr/testify/assert"
+)
+
+// TestingT is an interface wrapper around *testing.T
+type TestingT interface {
+	Logf(format string, args ...interface{})
+	Errorf(format string, args ...interface{})
+	FailNow()
+}
+
+/*
+	Call
+*/
+
+// Call represents a method call and is used for setting expectations,
+// as well as recording activity.
+type Call struct {
+	Parent *Mock
+
+	// The name of the method that was or will be called.
+	Method string
+
+	// Holds the arguments of the method.
+	Arguments Arguments
+
+	// Holds the arguments that should be returned when
+	// this method is called.
+	ReturnArguments Arguments
+
+	// Holds the caller info for the On() call
+	callerInfo []string
+
+	// The number of times to return the return arguments when setting
+	// expectations. 0 means to always return the value.
+	Repeatability int
+
+	// Amount of times this call has been called
+	totalCalls int
+
+	// Call to this method can be optional
+	optional bool
+
+	// Holds a channel that will be used to block the Return until it either
+	// receives a message or is closed. nil means it returns immediately.
+	WaitFor <-chan time.Time
+
+	waitTime time.Duration
+
+	// Holds a handler used to manipulate arguments content that are passed by
+	// reference. It's useful when mocking methods such as unmarshalers or
+	// decoders.
+	RunFn func(Arguments)
+}
+
+func newCall(parent *Mock, methodName string, callerInfo []string, methodArguments ...interface{}) *Call {
+	return &Call{
+		Parent:          parent,
+		Method:          methodName,
+		Arguments:       methodArguments,
+		ReturnArguments: make([]interface{}, 0),
+		callerInfo:      callerInfo,
+		Repeatability:   0,
+		WaitFor:         nil,
+		RunFn:           nil,
+	}
+}
+
+func (c *Call) lock() {
+	c.Parent.mutex.Lock()
+}
+
+func (c *Call) unlock() {
+	c.Parent.mutex.Unlock()
+}
+
+// Return specifies the return arguments for the expectation.
+//
+//    Mock.On("DoSomething").Return(errors.New("failed"))
+func (c *Call) Return(returnArguments ...interface{}) *Call {
+	c.lock()
+	defer c.unlock()
+
+	c.ReturnArguments = returnArguments
+
+	return c
+}
+
+// Once indicates that that the mock should only return the value once.
+//
+//    Mock.On("MyMethod", arg1, arg2).Return(returnArg1, returnArg2).Once()
+func (c *Call) Once() *Call {
+	return c.Times(1)
+}
+
+// Twice indicates that that the mock should only return the value twice.
+//
+//    Mock.On("MyMethod", arg1, arg2).Return(returnArg1, returnArg2).Twice()
+func (c *Call) Twice() *Call {
+	return c.Times(2)
+}
+
+// Times indicates that that the mock should only return the indicated number
+// of times.
+//
+//    Mock.On("MyMethod", arg1, arg2).Return(returnArg1, returnArg2).Times(5)
+func (c *Call) Times(i int) *Call {
+	c.lock()
+	defer c.unlock()
+	c.Repeatability = i
+	return c
+}
+
+// WaitUntil sets the channel that will block the mock's return until its closed
+// or a message is received.
+//
+//    Mock.On("MyMethod", arg1, arg2).WaitUntil(time.After(time.Second))
+func (c *Call) WaitUntil(w <-chan time.Time) *Call {
+	c.lock()
+	defer c.unlock()
+	c.WaitFor = w
+	return c
+}
+
+// After sets how long to block until the call returns
+//
+//    Mock.On("MyMethod", arg1, arg2).After(time.Second)
+func (c *Call) After(d time.Duration) *Call {
+	c.lock()
+	defer c.unlock()
+	c.waitTime = d
+	return c
+}
+
+// Run sets a handler to be called before returning. It can be used when
+// mocking a method such as unmarshalers that takes a pointer to a struct and
+// sets properties in such struct
+//
+//    Mock.On("Unmarshal", AnythingOfType("*map[string]interface{}").Return().Run(func(args Arguments) {
+//    	arg := args.Get(0).(*map[string]interface{})
+//    	arg["foo"] = "bar"
+//    })
+func (c *Call) Run(fn func(args Arguments)) *Call {
+	c.lock()
+	defer c.unlock()
+	c.RunFn = fn
+	return c
+}
+
+// Maybe allows the method call to be optional. Not calling an optional method
+// will not cause an error while asserting expectations
+func (c *Call) Maybe() *Call {
+	c.lock()
+	defer c.unlock()
+	c.optional = true
+	return c
+}
+
+// On chains a new expectation description onto the mocked interface. This
+// allows syntax like.
+//
+//    Mock.
+//       On("MyMethod", 1).Return(nil).
+//       On("MyOtherMethod", 'a', 'b', 'c').Return(errors.New("Some Error"))
+func (c *Call) On(methodName string, arguments ...interface{}) *Call {
+	return c.Parent.On(methodName, arguments...)
+}
+
+// Mock is the workhorse used to track activity on another object.
+// For an example of its usage, refer to the "Example Usage" section at the top
+// of this document.
+type Mock struct {
+	// Represents the calls that are expected of
+	// an object.
+	ExpectedCalls []*Call
+
+	// Holds the calls that were made to this mocked object.
+	Calls []Call
+
+	// test is An optional variable that holds the test struct, to be used when an
+	// invalid mock call was made.
+	test TestingT
+
+	// TestData holds any data that might be useful for testing.  Testify ignores
+	// this data completely allowing you to do whatever you like with it.
+	testData objx.Map
+
+	mutex sync.Mutex
+}
+
+// TestData holds any data that might be useful for testing.  Testify ignores
+// this data completely allowing you to do whatever you like with it.
+func (m *Mock) TestData() objx.Map {
+
+	if m.testData == nil {
+		m.testData = make(objx.Map)
+	}
+
+	return m.testData
+}
+
+/*
+	Setting expectations
+*/
+
+// Test sets the test struct variable of the mock object
+func (m *Mock) Test(t TestingT) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	m.test = t
+}
+
+// fail fails the current test with the given formatted format and args.
+// In case that a test was defined, it uses the test APIs for failing a test,
+// otherwise it uses panic.
+func (m *Mock) fail(format string, args ...interface{}) {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+
+	if m.test == nil {
+		panic(fmt.Sprintf(format, args...))
+	}
+	m.test.Errorf(format, args...)
+	m.test.FailNow()
+}
+
+// On starts a description of an expectation of the specified method
+// being called.
+//
+//     Mock.On("MyMethod", arg1, arg2)
+func (m *Mock) On(methodName string, arguments ...interface{}) *Call {
+	for _, arg := range arguments {
+		if v := reflect.ValueOf(arg); v.Kind() == reflect.Func {
+			panic(fmt.Sprintf("cannot use Func in expectations. Use mock.AnythingOfType(\"%T\")", arg))
+		}
+	}
+
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	c := newCall(m, methodName, assert.CallerInfo(), arguments...)
+	m.ExpectedCalls = append(m.ExpectedCalls, c)
+	return c
+}
+
+// /*
+// 	Recording and responding to activity
+// */
+
+func (m *Mock) findExpectedCall(method string, arguments ...interface{}) (int, *Call) {
+	for i, call := range m.ExpectedCalls {
+		if call.Method == method && call.Repeatability > -1 {
+
+			_, diffCount := call.Arguments.Diff(arguments)
+			if diffCount == 0 {
+				return i, call
+			}
+
+		}
+	}
+	return -1, nil
+}
+
+func (m *Mock) findClosestCall(method string, arguments ...interface{}) (*Call, string) {
+	var diffCount int
+	var closestCall *Call
+	var err string
+
+	for _, call := range m.expectedCalls() {
+		if call.Method == method {
+
+			errInfo, tempDiffCount := call.Arguments.Diff(arguments)
+			if tempDiffCount < diffCount || diffCount == 0 {
+				diffCount = tempDiffCount
+				closestCall = call
+				err = errInfo
+			}
+
+		}
+	}
+
+	return closestCall, err
+}
+
+func callString(method string, arguments Arguments, includeArgumentValues bool) string {
+
+	var argValsString string
+	if includeArgumentValues {
+		var argVals []string
+		for argIndex, arg := range arguments {
+			argVals = append(argVals, fmt.Sprintf("%d: %#v", argIndex, arg))
+		}
+		argValsString = fmt.Sprintf("\n\t\t%s", strings.Join(argVals, "\n\t\t"))
+	}
+
+	return fmt.Sprintf("%s(%s)%s", method, arguments.String(), argValsString)
+}
+
+// Called tells the mock object that a method has been called, and gets an array
+// of arguments to return.  Panics if the call is unexpected (i.e. not preceded by
+// appropriate .On .Return() calls)
+// If Call.WaitFor is set, blocks until the channel is closed or receives a message.
+func (m *Mock) Called(arguments ...interface{}) Arguments {
+	// get the calling function's name
+	pc, _, _, ok := runtime.Caller(1)
+	if !ok {
+		panic("Couldn't get the caller information")
+	}
+	functionPath := runtime.FuncForPC(pc).Name()
+	//Next four lines are required to use GCCGO function naming conventions.
+	//For Ex:  github_com_docker_libkv_store_mock.WatchTree.pN39_github_com_docker_libkv_store_mock.Mock
+	//uses interface information unlike golang github.com/docker/libkv/store/mock.(*Mock).WatchTree
+	//With GCCGO we need to remove interface information starting from pN<dd>.
+	re := regexp.MustCompile("\\.pN\\d+_")
+	if re.MatchString(functionPath) {
+		functionPath = re.Split(functionPath, -1)[0]
+	}
+	parts := strings.Split(functionPath, ".")
+	functionName := parts[len(parts)-1]
+	return m.MethodCalled(functionName, arguments...)
+}
+
+// MethodCalled tells the mock object that the given method has been called, and gets
+// an array of arguments to return. Panics if the call is unexpected (i.e. not preceded
+// by appropriate .On .Return() calls)
+// If Call.WaitFor is set, blocks until the channel is closed or receives a message.
+func (m *Mock) MethodCalled(methodName string, arguments ...interface{}) Arguments {
+	m.mutex.Lock()
+	//TODO: could combine expected and closes in single loop
+	found, call := m.findExpectedCall(methodName, arguments...)
+
+	if found < 0 {
+		// we have to fail here - because we don't know what to do
+		// as the return arguments.  This is because:
+		//
+		//   a) this is a totally unexpected call to this method,
+		//   b) the arguments are not what was expected, or
+		//   c) the developer has forgotten to add an accompanying On...Return pair.
+
+		closestCall, mismatch := m.findClosestCall(methodName, arguments...)
+		m.mutex.Unlock()
+
+		if closestCall != nil {
+			m.fail("\n\nmock: Unexpected Method Call\n-----------------------------\n\n%s\n\nThe closest call I have is: \n\n%s\n\n%s\nDiff: %s",
+				callString(methodName, arguments, true),
+				callString(methodName, closestCall.Arguments, true),
+				diffArguments(closestCall.Arguments, arguments),
+				strings.TrimSpace(mismatch),
+			)
+		} else {
+			m.fail("\nassert: mock: I don't know what to return because the method call was unexpected.\n\tEither do Mock.On(\"%s\").Return(...) first, or remove the %s() call.\n\tThis method was unexpected:\n\t\t%s\n\tat: %s", methodName, methodName, callString(methodName, arguments, true), assert.CallerInfo())
+		}
+	}
+
+	if call.Repeatability == 1 {
+		call.Repeatability = -1
+	} else if call.Repeatability > 1 {
+		call.Repeatability--
+	}
+	call.totalCalls++
+
+	// add the call
+	m.Calls = append(m.Calls, *newCall(m, methodName, assert.CallerInfo(), arguments...))
+	m.mutex.Unlock()
+
+	// block if specified
+	if call.WaitFor != nil {
+		<-call.WaitFor
+	} else {
+		time.Sleep(call.waitTime)
+	}
+
+	m.mutex.Lock()
+	runFn := call.RunFn
+	m.mutex.Unlock()
+
+	if runFn != nil {
+		runFn(arguments)
+	}
+
+	m.mutex.Lock()
+	returnArgs := call.ReturnArguments
+	m.mutex.Unlock()
+
+	return returnArgs
+}
+
+/*
+	Assertions
+*/
+
+type assertExpectationser interface {
+	AssertExpectations(TestingT) bool
+}
+
+// AssertExpectationsForObjects asserts that everything specified with On and Return
+// of the specified objects was in fact called as expected.
+//
+// Calls may have occurred in any order.
+func AssertExpectationsForObjects(t TestingT, testObjects ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	for _, obj := range testObjects {
+		if m, ok := obj.(Mock); ok {
+			t.Logf("Deprecated mock.AssertExpectationsForObjects(myMock.Mock) use mock.AssertExpectationsForObjects(myMock)")
+			obj = &m
+		}
+		m := obj.(assertExpectationser)
+		if !m.AssertExpectations(t) {
+			t.Logf("Expectations didn't match for Mock: %+v", reflect.TypeOf(m))
+			return false
+		}
+	}
+	return true
+}
+
+// AssertExpectations asserts that everything specified with On and Return was
+// in fact called as expected.  Calls may have occurred in any order.
+func (m *Mock) AssertExpectations(t TestingT) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	var somethingMissing bool
+	var failedExpectations int
+
+	// iterate through each expectation
+	expectedCalls := m.expectedCalls()
+	for _, expectedCall := range expectedCalls {
+		if !expectedCall.optional && !m.methodWasCalled(expectedCall.Method, expectedCall.Arguments) && expectedCall.totalCalls == 0 {
+			somethingMissing = true
+			failedExpectations++
+			t.Logf("FAIL:\t%s(%s)\n\t\tat: %s", expectedCall.Method, expectedCall.Arguments.String(), expectedCall.callerInfo)
+		} else {
+			if expectedCall.Repeatability > 0 {
+				somethingMissing = true
+				failedExpectations++
+				t.Logf("FAIL:\t%s(%s)\n\t\tat: %s", expectedCall.Method, expectedCall.Arguments.String(), expectedCall.callerInfo)
+			} else {
+				t.Logf("PASS:\t%s(%s)", expectedCall.Method, expectedCall.Arguments.String())
+			}
+		}
+	}
+
+	if somethingMissing {
+		t.Errorf("FAIL: %d out of %d expectation(s) were met.\n\tThe code you are testing needs to make %d more call(s).\n\tat: %s", len(expectedCalls)-failedExpectations, len(expectedCalls), failedExpectations, assert.CallerInfo())
+	}
+
+	return !somethingMissing
+}
+
+// AssertNumberOfCalls asserts that the method was called expectedCalls times.
+func (m *Mock) AssertNumberOfCalls(t TestingT, methodName string, expectedCalls int) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	var actualCalls int
+	for _, call := range m.calls() {
+		if call.Method == methodName {
+			actualCalls++
+		}
+	}
+	return assert.Equal(t, expectedCalls, actualCalls, fmt.Sprintf("Expected number of calls (%d) does not match the actual number of calls (%d).", expectedCalls, actualCalls))
+}
+
+// AssertCalled asserts that the method was called.
+// It can produce a false result when an argument is a pointer type and the underlying value changed after calling the mocked method.
+func (m *Mock) AssertCalled(t TestingT, methodName string, arguments ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	if !m.methodWasCalled(methodName, arguments) {
+		var calledWithArgs []string
+		for _, call := range m.calls() {
+			calledWithArgs = append(calledWithArgs, fmt.Sprintf("%v", call.Arguments))
+		}
+		if len(calledWithArgs) == 0 {
+			return assert.Fail(t, "Should have called with given arguments",
+				fmt.Sprintf("Expected %q to have been called with:\n%v\nbut no actual calls happened", methodName, arguments))
+		}
+		return assert.Fail(t, "Should have called with given arguments",
+			fmt.Sprintf("Expected %q to have been called with:\n%v\nbut actual calls were:\n        %v", methodName, arguments, strings.Join(calledWithArgs, "\n")))
+	}
+	return true
+}
+
+// AssertNotCalled asserts that the method was not called.
+// It can produce a false result when an argument is a pointer type and the underlying value changed after calling the mocked method.
+func (m *Mock) AssertNotCalled(t TestingT, methodName string, arguments ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	if m.methodWasCalled(methodName, arguments) {
+		return assert.Fail(t, "Should not have called with given arguments",
+			fmt.Sprintf("Expected %q to not have been called with:\n%v\nbut actually it was.", methodName, arguments))
+	}
+	return true
+}
+
+func (m *Mock) methodWasCalled(methodName string, expected []interface{}) bool {
+	for _, call := range m.calls() {
+		if call.Method == methodName {
+
+			_, differences := Arguments(expected).Diff(call.Arguments)
+
+			if differences == 0 {
+				// found the expected call
+				return true
+			}
+
+		}
+	}
+	// we didn't find the expected call
+	return false
+}
+
+func (m *Mock) expectedCalls() []*Call {
+	return append([]*Call{}, m.ExpectedCalls...)
+}
+
+func (m *Mock) calls() []Call {
+	return append([]Call{}, m.Calls...)
+}
+
+/*
+	Arguments
+*/
+
+// Arguments holds an array of method arguments or return values.
+type Arguments []interface{}
+
+const (
+	// Anything is used in Diff and Assert when the argument being tested
+	// shouldn't be taken into consideration.
+	Anything = "mock.Anything"
+)
+
+// AnythingOfTypeArgument is a string that contains the type of an argument
+// for use when type checking.  Used in Diff and Assert.
+type AnythingOfTypeArgument string
+
+// AnythingOfType returns an AnythingOfTypeArgument object containing the
+// name of the type to check for.  Used in Diff and Assert.
+//
+// For example:
+//	Assert(t, AnythingOfType("string"), AnythingOfType("int"))
+func AnythingOfType(t string) AnythingOfTypeArgument {
+	return AnythingOfTypeArgument(t)
+}
+
+// argumentMatcher performs custom argument matching, returning whether or
+// not the argument is matched by the expectation fixture function.
+type argumentMatcher struct {
+	// fn is a function which accepts one argument, and returns a bool.
+	fn reflect.Value
+}
+
+func (f argumentMatcher) Matches(argument interface{}) bool {
+	expectType := f.fn.Type().In(0)
+	expectTypeNilSupported := false
+	switch expectType.Kind() {
+	case reflect.Interface, reflect.Chan, reflect.Func, reflect.Map, reflect.Slice, reflect.Ptr:
+		expectTypeNilSupported = true
+	}
+
+	argType := reflect.TypeOf(argument)
+	var arg reflect.Value
+	if argType == nil {
+		arg = reflect.New(expectType).Elem()
+	} else {
+		arg = reflect.ValueOf(argument)
+	}
+
+	if argType == nil && !expectTypeNilSupported {
+		panic(errors.New("attempting to call matcher with nil for non-nil expected type"))
+	}
+	if argType == nil || argType.AssignableTo(expectType) {
+		result := f.fn.Call([]reflect.Value{arg})
+		return result[0].Bool()
+	}
+	return false
+}
+
+func (f argumentMatcher) String() string {
+	return fmt.Sprintf("func(%s) bool", f.fn.Type().In(0).Name())
+}
+
+// MatchedBy can be used to match a mock call based on only certain properties
+// from a complex struct or some calculation. It takes a function that will be
+// evaluated with the called argument and will return true when there's a match
+// and false otherwise.
+//
+// Example:
+// m.On("Do", MatchedBy(func(req *http.Request) bool { return req.Host == "example.com" }))
+//
+// |fn|, must be a function accepting a single argument (of the expected type)
+// which returns a bool. If |fn| doesn't match the required signature,
+// MatchedBy() panics.
+func MatchedBy(fn interface{}) argumentMatcher {
+	fnType := reflect.TypeOf(fn)
+
+	if fnType.Kind() != reflect.Func {
+		panic(fmt.Sprintf("assert: arguments: %s is not a func", fn))
+	}
+	if fnType.NumIn() != 1 {
+		panic(fmt.Sprintf("assert: arguments: %s does not take exactly one argument", fn))
+	}
+	if fnType.NumOut() != 1 || fnType.Out(0).Kind() != reflect.Bool {
+		panic(fmt.Sprintf("assert: arguments: %s does not return a bool", fn))
+	}
+
+	return argumentMatcher{fn: reflect.ValueOf(fn)}
+}
+
+// Get Returns the argument at the specified index.
+func (args Arguments) Get(index int) interface{} {
+	if index+1 > len(args) {
+		panic(fmt.Sprintf("assert: arguments: Cannot call Get(%d) because there are %d argument(s).", index, len(args)))
+	}
+	return args[index]
+}
+
+// Is gets whether the objects match the arguments specified.
+func (args Arguments) Is(objects ...interface{}) bool {
+	for i, obj := range args {
+		if obj != objects[i] {
+			return false
+		}
+	}
+	return true
+}
+
+// Diff gets a string describing the differences between the arguments
+// and the specified objects.
+//
+// Returns the diff string and number of differences found.
+func (args Arguments) Diff(objects []interface{}) (string, int) {
+	//TODO: could return string as error and nil for No difference
+
+	var output = "\n"
+	var differences int
+
+	var maxArgCount = len(args)
+	if len(objects) > maxArgCount {
+		maxArgCount = len(objects)
+	}
+
+	for i := 0; i < maxArgCount; i++ {
+		var actual, expected interface{}
+		var actualFmt, expectedFmt string
+
+		if len(objects) <= i {
+			actual = "(Missing)"
+			actualFmt = "(Missing)"
+		} else {
+			actual = objects[i]
+			actualFmt = fmt.Sprintf("(%[1]T=%[1]v)", actual)
+		}
+
+		if len(args) <= i {
+			expected = "(Missing)"
+			expectedFmt = "(Missing)"
+		} else {
+			expected = args[i]
+			expectedFmt = fmt.Sprintf("(%[1]T=%[1]v)", expected)
+		}
+
+		if matcher, ok := expected.(argumentMatcher); ok {
+			if matcher.Matches(actual) {
+				output = fmt.Sprintf("%s\t%d: PASS:  %s matched by %s\n", output, i, actualFmt, matcher)
+			} else {
+				differences++
+				output = fmt.Sprintf("%s\t%d: PASS:  %s not matched by %s\n", output, i, actualFmt, matcher)
+			}
+		} else if reflect.TypeOf(expected) == reflect.TypeOf((*AnythingOfTypeArgument)(nil)).Elem() {
+
+			// type checking
+			if reflect.TypeOf(actual).Name() != string(expected.(AnythingOfTypeArgument)) && reflect.TypeOf(actual).String() != string(expected.(AnythingOfTypeArgument)) {
+				// not match
+				differences++
+				output = fmt.Sprintf("%s\t%d: FAIL:  type %s != type %s - %s\n", output, i, expected, reflect.TypeOf(actual).Name(), actualFmt)
+			}
+
+		} else {
+
+			// normal checking
+
+			if assert.ObjectsAreEqual(expected, Anything) || assert.ObjectsAreEqual(actual, Anything) || assert.ObjectsAreEqual(actual, expected) {
+				// match
+				output = fmt.Sprintf("%s\t%d: PASS:  %s == %s\n", output, i, actualFmt, expectedFmt)
+			} else {
+				// not match
+				differences++
+				output = fmt.Sprintf("%s\t%d: FAIL:  %s != %s\n", output, i, actualFmt, expectedFmt)
+			}
+		}
+
+	}
+
+	if differences == 0 {
+		return "No differences.", differences
+	}
+
+	return output, differences
+
+}
+
+// Assert compares the arguments with the specified objects and fails if
+// they do not exactly match.
+func (args Arguments) Assert(t TestingT, objects ...interface{}) bool {
+	if h, ok := t.(tHelper); ok {
+		h.Helper()
+	}
+
+	// get the differences
+	diff, diffCount := args.Diff(objects)
+
+	if diffCount == 0 {
+		return true
+	}
+
+	// there are differences... report them...
+	t.Logf(diff)
+	t.Errorf("%sArguments do not match.", assert.CallerInfo())
+
+	return false
+
+}
+
+// String gets the argument at the specified index. Panics if there is no argument, or
+// if the argument is of the wrong type.
+//
+// If no index is provided, String() returns a complete string representation
+// of the arguments.
+func (args Arguments) String(indexOrNil ...int) string {
+
+	if len(indexOrNil) == 0 {
+		// normal String() method - return a string representation of the args
+		var argsStr []string
+		for _, arg := range args {
+			argsStr = append(argsStr, fmt.Sprintf("%s", reflect.TypeOf(arg)))
+		}
+		return strings.Join(argsStr, ",")
+	} else if len(indexOrNil) == 1 {
+		// Index has been specified - get the argument at that index
+		var index = indexOrNil[0]
+		var s string
+		var ok bool
+		if s, ok = args.Get(index).(string); !ok {
+			panic(fmt.Sprintf("assert: arguments: String(%d) failed because object wasn't correct type: %s", index, args.Get(index)))
+		}
+		return s
+	}
+
+	panic(fmt.Sprintf("assert: arguments: Wrong number of arguments passed to String.  Must be 0 or 1, not %d", len(indexOrNil)))
+
+}
+
+// Int gets the argument at the specified index. Panics if there is no argument, or
+// if the argument is of the wrong type.
+func (args Arguments) Int(index int) int {
+	var s int
+	var ok bool
+	if s, ok = args.Get(index).(int); !ok {
+		panic(fmt.Sprintf("assert: arguments: Int(%d) failed because object wasn't correct type: %v", index, args.Get(index)))
+	}
+	return s
+}
+
+// Error gets the argument at the specified index. Panics if there is no argument, or
+// if the argument is of the wrong type.
+func (args Arguments) Error(index int) error {
+	obj := args.Get(index)
+	var s error
+	var ok bool
+	if obj == nil {
+		return nil
+	}
+	if s, ok = obj.(error); !ok {
+		panic(fmt.Sprintf("assert: arguments: Error(%d) failed because object wasn't correct type: %v", index, args.Get(index)))
+	}
+	return s
+}
+
+// Bool gets the argument at the specified index. Panics if there is no argument, or
+// if the argument is of the wrong type.
+func (args Arguments) Bool(index int) bool {
+	var s bool
+	var ok bool
+	if s, ok = args.Get(index).(bool); !ok {
+		panic(fmt.Sprintf("assert: arguments: Bool(%d) failed because object wasn't correct type: %v", index, args.Get(index)))
+	}
+	return s
+}
+
+func typeAndKind(v interface{}) (reflect.Type, reflect.Kind) {
+	t := reflect.TypeOf(v)
+	k := t.Kind()
+
+	if k == reflect.Ptr {
+		t = t.Elem()
+		k = t.Kind()
+	}
+	return t, k
+}
+
+func diffArguments(expected Arguments, actual Arguments) string {
+	if len(expected) != len(actual) {
+		return fmt.Sprintf("Provided %v arguments, mocked for %v arguments", len(expected), len(actual))
+	}
+
+	for x := range expected {
+		if diffString := diff(expected[x], actual[x]); diffString != "" {
+			return fmt.Sprintf("Difference found in argument %v:\n\n%s", x, diffString)
+		}
+	}
+
+	return ""
+}
+
+// diff returns a diff of both values as long as both are of the same type and
+// are a struct, map, slice or array. Otherwise it returns an empty string.
+func diff(expected interface{}, actual interface{}) string {
+	if expected == nil || actual == nil {
+		return ""
+	}
+
+	et, ek := typeAndKind(expected)
+	at, _ := typeAndKind(actual)
+
+	if et != at {
+		return ""
+	}
+
+	if ek != reflect.Struct && ek != reflect.Map && ek != reflect.Slice && ek != reflect.Array {
+		return ""
+	}
+
+	e := spewConfig.Sdump(expected)
+	a := spewConfig.Sdump(actual)
+
+	diff, _ := difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
+		A:        difflib.SplitLines(e),
+		B:        difflib.SplitLines(a),
+		FromFile: "Expected",
+		FromDate: "",
+		ToFile:   "Actual",
+		ToDate:   "",
+		Context:  1,
+	})
+
+	return diff
+}
+
+var spewConfig = spew.ConfigState{
+	Indent:                  " ",
+	DisablePointerAddresses: true,
+	DisableCapacities:       true,
+	SortKeys:                true,
+}
+
+type tHelper interface {
+	Helper()
+}
diff --git a/go/vendor/vendor.json b/go/vendor/vendor.json
index d4f9288..1246991 100644
--- a/go/vendor/vendor.json
+++ b/go/vendor/vendor.json
@@ -3,6 +3,12 @@
 	"ignore": "test",
 	"package": [
 		{
+			"checksumSHA1": "CSPbwbyzqA6sfORicn4HFtIhF/c=",
+			"path": "github.com/davecgh/go-spew/spew",
+			"revision": "d8f796af33cc11cb798c1aaeb27a4ebc5099927d",
+			"revisionTime": "2018-08-30T19:11:22Z"
+		},
+		{
 			"checksumSHA1": "mE9XW26JSpe4meBObM6J/Oeq0eg=",
 			"path": "github.com/golang/protobuf/proto",
 			"revision": "aa810b61a9c79d51363740d207bb46cf8e620ed5",
@@ -61,6 +67,12 @@
 			"revisionTime": "2018-11-12T10:25:10Z"
 		},
 		{
+			"checksumSHA1": "LuFv4/jlrmFNnDb/5SCSEPAM9vU=",
+			"path": "github.com/pmezard/go-difflib/difflib",
+			"revision": "5d4384ee4fb2527b0a1256a821ebfc92f91efefc",
+			"revisionTime": "2018-12-26T10:54:42Z"
+		},
+		{
 			"checksumSHA1": "GWtDi0sYbtCQzF/ZaVhaHvCMvuk=",
 			"path": "github.com/sirupsen/logrus",
 			"revision": "c155da19408a8799da419ed3eeb0cb5db0ad5dbc",
@@ -69,6 +81,36 @@
 			"versionExact": "v1.0.5"
 		},
 		{
+			"checksumSHA1": "BBudH/js1dNI/nEfTwsAYUo9l2M=",
+			"path": "github.com/stretchr/objx",
+			"revision": "ef50b0de28773081167c97fc27cf29a0bf8b8c71",
+			"revisionTime": "2018-08-25T06:49:32Z"
+		},
+		{
+			"checksumSHA1": "fQM6WzJz29dM3+rwI4EXNVU+9UE=",
+			"path": "github.com/stretchr/testify",
+			"revision": "865fb2c8f5af9ccbaaadfd20d18236358dccaaff",
+			"revisionTime": "2018-09-01T16:25:39Z"
+		},
+		{
+			"checksumSHA1": "6QB6TZUxUsC82XEtugVx6NHu4lc=",
+			"path": "github.com/stretchr/testify/assert",
+			"revision": "865fb2c8f5af9ccbaaadfd20d18236358dccaaff",
+			"revisionTime": "2018-09-01T16:25:39Z"
+		},
+		{
+			"checksumSHA1": "fg3TzS9/QK3wZbzei3Z6O8XPLHg=",
+			"path": "github.com/stretchr/testify/http",
+			"revision": "865fb2c8f5af9ccbaaadfd20d18236358dccaaff",
+			"revisionTime": "2018-09-01T16:25:39Z"
+		},
+		{
+			"checksumSHA1": "WmBSFdqpdYRIkp0I408JIZ3LDMY=",
+			"path": "github.com/stretchr/testify/mock",
+			"revision": "865fb2c8f5af9ccbaaadfd20d18236358dccaaff",
+			"revisionTime": "2018-09-01T16:25:39Z"
+		},
+		{
 			"checksumSHA1": "K8ub2fUgYq2Sb3FbKPzGhv96UNo=",
 			"path": "gitlab.com/gitlab-org/gitaly-proto/go/gitalypb",
 			"revision": "ca09ca1e2da6dc957644fa95990e8a3d032d6252",