ES5 Methods shim

    (function() {

        /**
         * Brings an environment as close to ECMAScript 5 compliance
         * as is possible with the facilities of erstwhile engines.
         *
         * Annotated ES5: http://es5.github.com/ (specific links below)
         * ES5 Spec: http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf
         * Required reading: http://javascriptweblog.wordpress.com/2011/12/05/extending-javascript-natives/
         */

        // Shortcut to an often accessed properties, in order to avoid multiple
        // dereference that costs universally.
        var ArrayPrototype = Array.prototype;
        var ObjectPrototype = Object.prototype;
        var FunctionPrototype = Function.prototype;
        var StringPrototype = String.prototype;
        var NumberPrototype = Number.prototype;
        var array_slice = ArrayPrototype.slice;
        var array_splice = ArrayPrototype.splice;
        var array_push = ArrayPrototype.push;
        var array_unshift = ArrayPrototype.unshift;
        var array_concat = ArrayPrototype.concat;
        var call = FunctionPrototype.call;

        // Having a toString local variable name breaks in Opera so use to_string.
        var to_string = ObjectPrototype.toString;

        var isArray = Array.isArray || function isArray(obj) {
            return to_string.call(obj) === '[object Array]';
        };

        var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
        var isCallable; /* inlined from https://npmjs.com/is-callable */
        var fnToStr = Function.prototype.toString,
            tryFunctionObject = function tryFunctionObject(value) {
                try {
                    fnToStr.call(value);
                    return true;
                } catch (e) {
                    return false;
                }
            },
            fnClass = '[object Function]',
            genClass = '[object GeneratorFunction]';
        isCallable = function isCallable(value) {
            if (typeof value !== 'function') {
                return false;
            }
            if (hasToStringTag) {
                return tryFunctionObject(value);
            }
            var strClass = to_string.call(value);
            return strClass === fnClass || strClass === genClass;
        };
        var isRegex; /* inlined from https://npmjs.com/is-regex */
        var regexExec = RegExp.prototype.exec,
            tryRegexExec = function tryRegexExec(value) {
                try {
                    regexExec.call(value);
                    return true;
                } catch (e) {
                    return false;
                }
            },
            regexClass = '[object RegExp]';
        isRegex = function isRegex(value) {
            if (typeof value !== 'object') {
                return false;
            }
            return hasToStringTag ? tryRegexExec(value) : to_string.call(value) === regexClass;
        };
        var isString; /* inlined from https://npmjs.com/is-string */
        var strValue = String.prototype.valueOf,
            tryStringObject = function tryStringObject(value) {
                try {
                    strValue.call(value);
                    return true;
                } catch (e) {
                    return false;
                }
            },
            stringClass = '[object String]';
        isString = function isString(value) {
            if (typeof value === 'string') {
                return true;
            }
            if (typeof value !== 'object') {
                return false;
            }
            return hasToStringTag ? tryStringObject(value) : to_string.call(value) === stringClass;
        };

        var isArguments = function isArguments(value) {
            var str = to_string.call(value);
            var isArgs = str === '[object Arguments]';
            if (!isArgs) {
                isArgs = !isArray(value) &&
                    value !== null &&
                    typeof value === 'object' &&
                    typeof value.length === 'number' &&
                    value.length >= 0 &&
                    isCallable(value.callee);
            }
            return isArgs;
        };

        /* inlined from http://npmjs.com/define-properties */
        var defineProperties = (function(has) {
            var supportsDescriptors = Object.defineProperty && (function() {
                try {
                    var obj = {};
                    Object.defineProperty(obj, 'x', { enumerable: false, value: obj });
                    for (var _ in obj) {
                        return false;
                    }
                    return obj.x === obj;
                } catch (e) { /* this is ES3 */
                    return false;
                }
            }());

            // Define configurable, writable and non-enumerable props
            // if they don't exist.
            var defineProperty;
            if (supportsDescriptors) {
                defineProperty = function(object, name, method, forceAssign) {
                    if (!forceAssign && (name in object)) {
                        return;
                    }
                    Object.defineProperty(object, name, {
                        configurable: true,
                        enumerable: false,
                        writable: true,
                        value: method
                    });
                };
            } else {
                defineProperty = function(object, name, method, forceAssign) {
                    if (!forceAssign && (name in object)) {
                        return;
                    }
                    object[name] = method;
                };
            }
            return function defineProperties(object, map, forceAssign) {
                for (var name in map) {
                    if (has.call(map, name)) {
                        defineProperty(object, name, map[name], forceAssign);
                    }
                }
            };
        }(ObjectPrototype.hasOwnProperty));

        //
        // Util
        // ======
        //

        /* replaceable with https://npmjs.com/package/es-abstract /helpers/isPrimitive */
        var isPrimitive = function isPrimitive(input) {
            var type = typeof input;
            return input === null || (type !== 'object' && type !== 'function');
        };

        var ES = {
            // ES5 9.4
            // http://es5.github.com/#x9.4
            // http://jsperf.com/to-integer
            /* replaceable with https://npmjs.com/package/es-abstract ES5.ToInteger */
            ToInteger: function ToInteger(num) {
                var n = +num;
                if (n !== n) { // isNaN
                    n = 0;
                } else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) {
                    n = (n > 0 || -1) * Math.floor(Math.abs(n));
                }
                return n;
            },

            /* replaceable with https://npmjs.com/package/es-abstract ES5.ToPrimitive */
            ToPrimitive: function ToPrimitive(input) {
                var val, valueOf, toStr;
                if (isPrimitive(input)) {
                    return input;
                }
                valueOf = input.valueOf;
                if (isCallable(valueOf)) {
                    val = valueOf.call(input);
                    if (isPrimitive(val)) {
                        return val;
                    }
                }
                toStr = input.toString;
                if (isCallable(toStr)) {
                    val = toStr.call(input);
                    if (isPrimitive(val)) {
                        return val;
                    }
                }
                throw new TypeError();
            },

            // ES5 9.9
            // http://es5.github.com/#x9.9
            /* replaceable with https://npmjs.com/package/es-abstract ES5.ToObject */
            ToObject: function(o) {
                /*jshint eqnull: true */
                if (o == null) { // this matches both null and undefined
                    throw new TypeError("can't convert " + o + ' to object');
                }
                return Object(o);
            },

            /* replaceable with https://npmjs.com/package/es-abstract ES5.ToUint32 */
            ToUint32: function ToUint32(x) {
                return x >>> 0;
            }
        };

        //
        // Function
        // ========
        //

        // ES-5 15.3.4.5
        // http://es5.github.com/#x15.3.4.5

        var Empty = function Empty() {};

        defineProperties(FunctionPrototype, {
            bind: function bind(that) { // .length is 1
                // 1. Let Target be the this value.
                var target = this;
                // 2. If IsCallable(Target) is false, throw a TypeError exception.
                if (!isCallable(target)) {
                    throw new TypeError('Function.prototype.bind called on incompatible ' + target);
                }
                // 3. Let A be a new (possibly empty) internal list of all of the
                //   argument values provided after thisArg (arg1, arg2 etc), in order.
                // XXX slicedArgs will stand in for "A" if used
                var args = array_slice.call(arguments, 1); // for normal call
                // 4. Let F be a new native ECMAScript object.
                // 11. Set the [[Prototype]] internal property of F to the standard
                //   built-in Function prototype object as specified in 15.3.3.1.
                // 12. Set the [[Call]] internal property of F as described in
                //   15.3.4.5.1.
                // 13. Set the [[Construct]] internal property of F as described in
                //   15.3.4.5.2.
                // 14. Set the [[HasInstance]] internal property of F as described in
                //   15.3.4.5.3.
                var bound;
                var binder = function() {

                    if (this instanceof bound) {
                        // 15.3.4.5.2 [[Construct]]
                        // When the [[Construct]] internal method of a function object,
                        // F that was created using the bind function is called with a
                        // list of arguments ExtraArgs, the following steps are taken:
                        // 1. Let target be the value of F's [[TargetFunction]]
                        //   internal property.
                        // 2. If target has no [[Construct]] internal method, a
                        //   TypeError exception is thrown.
                        // 3. Let boundArgs be the value of F's [[BoundArgs]] internal
                        //   property.
                        // 4. Let args be a new list containing the same values as the
                        //   list boundArgs in the same order followed by the same
                        //   values as the list ExtraArgs in the same order.
                        // 5. Return the result of calling the [[Construct]] internal
                        //   method of target providing args as the arguments.

                        var result = target.apply(
                            this,
                            array_concat.call(args, array_slice.call(arguments))
                        );
                        if (Object(result) === result) {
                            return result;
                        }
                        return this;

                    } else {
                        // 15.3.4.5.1 [[Call]]
                        // When the [[Call]] internal method of a function object, F,
                        // which was created using the bind function is called with a
                        // this value and a list of arguments ExtraArgs, the following
                        // steps are taken:
                        // 1. Let boundArgs be the value of F's [[BoundArgs]] internal
                        //   property.
                        // 2. Let boundThis be the value of F's [[BoundThis]] internal
                        //   property.
                        // 3. Let target be the value of F's [[TargetFunction]] internal
                        //   property.
                        // 4. Let args be a new list containing the same values as the
                        //   list boundArgs in the same order followed by the same
                        //   values as the list ExtraArgs in the same order.
                        // 5. Return the result of calling the [[Call]] internal method
                        //   of target providing boundThis as the this value and
                        //   providing args as the arguments.

                        // equiv: target.call(this, ...boundArgs, ...args)
                        return target.apply(
                            that,
                            array_concat.call(args, array_slice.call(arguments))
                        );

                    }

                };

                // 15. If the [[Class]] internal property of Target is "Function", then
                //     a. Let L be the length property of Target minus the length of A.
                //     b. Set the length own property of F to either 0 or L, whichever is
                //       larger.
                // 16. Else set the length own property of F to 0.

                var boundLength = Math.max(0, target.length - args.length);

                // 17. Set the attributes of the length own property of F to the values
                //   specified in 15.3.5.1.
                var boundArgs = [];
                for (var i = 0; i < boundLength; i++) {
                    boundArgs.push('$' + i);
                }

                // XXX Build a dynamic function with desired amount of arguments is the only
                // way to set the length property of a function.
                // In environments where Content Security Policies enabled (Chrome extensions,
                // for ex.) all use of eval or Function costructor throws an exception.
                // However in all of these environments Function.prototype.bind exists
                // and so this code will never be executed.
                bound = Function('binder', 'return function (' + boundArgs.join(',') + '){ return binder.apply(this, arguments); }')(binder);

                if (target.prototype) {
                    Empty.prototype = target.prototype;
                    bound.prototype = new Empty();
                    // Clean up dangling references.
                    Empty.prototype = null;
                }

                // TODO
                // 18. Set the [[Extensible]] internal property of F to true.

                // TODO
                // 19. Let thrower be the [[ThrowTypeError]] function Object (13.2.3).
                // 20. Call the [[DefineOwnProperty]] internal method of F with
                //   arguments "caller", PropertyDescriptor {[[Get]]: thrower, [[Set]]:
                //   thrower, [[Enumerable]]: false, [[Configurable]]: false}, and
                //   false.
                // 21. Call the [[DefineOwnProperty]] internal method of F with
                //   arguments "arguments", PropertyDescriptor {[[Get]]: thrower,
                //   [[Set]]: thrower, [[Enumerable]]: false, [[Configurable]]: false},
                //   and false.

                // TODO
                // NOTE Function objects created using Function.prototype.bind do not
                // have a prototype property or the [[Code]], [[FormalParameters]], and
                // [[Scope]] internal properties.
                // XXX can't delete prototype in pure-js.

                // 22. Return F.
                return bound;
            }
        });

        // _Please note: Shortcuts are defined after `Function.prototype.bind` as we
        // us it in defining shortcuts.
        var owns = call.bind(ObjectPrototype.hasOwnProperty);

        //
        // Array
        // =====
        //

        // ES5 15.4.4.12
        // http://es5.github.com/#x15.4.4.12
        var spliceNoopReturnsEmptyArray = (function() {
            var a = [1, 2];
            var result = a.splice();
            return a.length === 2 && isArray(result) && result.length === 0;
        }());
        defineProperties(ArrayPrototype, {
            // Safari 5.0 bug where .splice() returns undefined
            splice: function splice(start, deleteCount) {
                if (arguments.length === 0) {
                    return [];
                } else {
                    return array_splice.apply(this, arguments);
                }
            }
        }, !spliceNoopReturnsEmptyArray);

        var spliceWorksWithEmptyObject = (function() {
            var obj = {};
            ArrayPrototype.splice.call(obj, 0, 0, 1);
            return obj.length === 1;
        }());
        defineProperties(ArrayPrototype, {
            splice: function splice(start, deleteCount) {
                if (arguments.length === 0) {
                    return [];
                }
                var args = arguments;
                this.length = Math.max(ES.ToInteger(this.length), 0);
                if (arguments.length > 0 && typeof deleteCount !== 'number') {
                    args = array_slice.call(arguments);
                    if (args.length < 2) {
                        args.push(this.length - start);
                    } else {
                        args[1] = ES.ToInteger(deleteCount);
                    }
                }
                return array_splice.apply(this, args);
            }
        }, !spliceWorksWithEmptyObject);

        // ES5 15.4.4.12
        // http://es5.github.com/#x15.4.4.13
        // Return len+argCount.
        // [bugfix, ielt8]
        // IE < 8 bug: [].unshift(0) === undefined but should be "1"
        var hasUnshiftReturnValueBug = [].unshift(0) !== 1;
        defineProperties(ArrayPrototype, {
            unshift: function() {
                array_unshift.apply(this, arguments);
                return this.length;
            }
        }, hasUnshiftReturnValueBug);

        // ES5 15.4.3.2
        // http://es5.github.com/#x15.4.3.2
        // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
        defineProperties(Array, { isArray: isArray });

        // The IsCallable() check in the Array functions
        // has been replaced with a strict check on the
        // internal class of the object to trap cases where
        // the provided function was actually a regular
        // expression literal, which in V8 and
        // JavaScriptCore is a typeof "function".  Only in
        // V8 are regular expression literals permitted as
        // reduce parameters, so it is desirable in the
        // general case for the shim to match the more
        // strict and common behavior of rejecting regular
        // expressions.

        // ES5 15.4.4.18
        // http://es5.github.com/#x15.4.4.18
        // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/array/forEach

        // Check failure of by-index access of string characters (IE < 9)
        // and failure of `0 in boxedString` (Rhino)
        var boxedString = Object('a');
        var splitString = boxedString[0] !== 'a' || !(0 in boxedString);

        var properlyBoxesContext = function properlyBoxed(method) {
            // Check node 0.6.21 bug where third parameter is not boxed
            var properlyBoxesNonStrict = true;
            var properlyBoxesStrict = true;
            if (method) {
                method.call('foo', function(_, __, context) {
                    if (typeof context !== 'object') { properlyBoxesNonStrict = false; }
                });

                method.call([1], function() {
                    'use strict';

                    properlyBoxesStrict = typeof this === 'string';
                }, 'x');
            }
            return !!method && properlyBoxesNonStrict && properlyBoxesStrict;
        };

        defineProperties(ArrayPrototype, {
            forEach: function forEach(callbackfn /*, thisArg*/ ) {
                var object = ES.ToObject(this);
                var self = splitString && isString(this) ? this.split('') : object;
                var i = -1;
                var length = self.length >>> 0;
                var T;
                if (arguments.length > 1) {
                    T = arguments[1];
                }

                // If no callback function or if callback is not a callable function
                if (!isCallable(callbackfn)) {
                    throw new TypeError('Array.prototype.forEach callback must be a function');
                }

                while (++i < length) {
                    if (i in self) {
                        // Invoke the callback function with call, passing arguments:
                        // context, property value, property key, thisArg object
                        if (typeof T !== 'undefined') {
                            callbackfn.call(T, self[i], i, object);
                        } else {
                            callbackfn(self[i], i, object);
                        }
                    }
                }
            }
        }, !properlyBoxesContext(ArrayPrototype.forEach));

        // ES5 15.4.4.19
        // http://es5.github.com/#x15.4.4.19
        // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
        defineProperties(ArrayPrototype, {
            map: function map(callbackfn /*, thisArg*/ ) {
                var object = ES.ToObject(this);
                var self = splitString && isString(this) ? this.split('') : object;
                var length = self.length >>> 0;
                var result = Array(length);
                var T;
                if (arguments.length > 1) {
                    T = arguments[1];
                }

                // If no callback function or if callback is not a callable function
                if (!isCallable(callbackfn)) {
                    throw new TypeError('Array.prototype.map callback must be a function');
                }

                for (var i = 0; i < length; i++) {
                    if (i in self) {
                        if (typeof T !== 'undefined') {
                            result[i] = callbackfn.call(T, self[i], i, object);
                        } else {
                            result[i] = callbackfn(self[i], i, object);
                        }
                    }
                }
                return result;
            }
        }, !properlyBoxesContext(ArrayPrototype.map));

        // ES5 15.4.4.20
        // http://es5.github.com/#x15.4.4.20
        // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/filter
        defineProperties(ArrayPrototype, {
            filter: function filter(callbackfn /*, thisArg*/ ) {
                var object = ES.ToObject(this);
                var self = splitString && isString(this) ? this.split('') : object;
                var length = self.length >>> 0;
                var result = [];
                var value;
                var T;
                if (arguments.length > 1) {
                    T = arguments[1];
                }

                // If no callback function or if callback is not a callable function
                if (!isCallable(callbackfn)) {
                    throw new TypeError('Array.prototype.filter callback must be a function');
                }

                for (var i = 0; i < length; i++) {
                    if (i in self) {
                        value = self[i];
                        if (typeof T === 'undefined' ? callbackfn(value, i, object) : callbackfn.call(T, value, i, object)) {
                            result.push(value);
                        }
                    }
                }
                return result;
            }
        }, !properlyBoxesContext(ArrayPrototype.filter));

        // ES5 15.4.4.16
        // http://es5.github.com/#x15.4.4.16
        // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/every
        defineProperties(ArrayPrototype, {
            every: function every(callbackfn /*, thisArg*/ ) {
                var object = ES.ToObject(this);
                var self = splitString && isString(this) ? this.split('') : object;
                var length = self.length >>> 0;
                var T;
                if (arguments.length > 1) {
                    T = arguments[1];
                }

                // If no callback function or if callback is not a callable function
                if (!isCallable(callbackfn)) {
                    throw new TypeError('Array.prototype.every callback must be a function');
                }

                for (var i = 0; i < length; i++) {
                    if (i in self && !(typeof T === 'undefined' ? callbackfn(self[i], i, object) : callbackfn.call(T, self[i], i, object))) {
                        return false;
                    }
                }
                return true;
            }
        }, !properlyBoxesContext(ArrayPrototype.every));

        // ES5 15.4.4.17
        // http://es5.github.com/#x15.4.4.17
        // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
        defineProperties(ArrayPrototype, {
            some: function some(callbackfn /*, thisArg */ ) {
                var object = ES.ToObject(this);
                var self = splitString && isString(this) ? this.split('') : object;
                var length = self.length >>> 0;
                var T;
                if (arguments.length > 1) {
                    T = arguments[1];
                }

                // If no callback function or if callback is not a callable function
                if (!isCallable(callbackfn)) {
                    throw new TypeError('Array.prototype.some callback must be a function');
                }

                for (var i = 0; i < length; i++) {
                    if (i in self && (typeof T === 'undefined' ? callbackfn(self[i], i, object) : callbackfn.call(T, self[i], i, object))) {
                        return true;
                    }
                }
                return false;
            }
        }, !properlyBoxesContext(ArrayPrototype.some));

        // ES5 15.4.4.21
        // http://es5.github.com/#x15.4.4.21
        // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduce
        var reduceCoercesToObject = false;
        if (ArrayPrototype.reduce) {
            reduceCoercesToObject = typeof ArrayPrototype.reduce.call('es5', function(_, __, ___, list) {
                return list;
            }) === 'object';
        }
        defineProperties(ArrayPrototype, {
            reduce: function reduce(callbackfn /*, initialValue*/ ) {
                var object = ES.ToObject(this);
                var self = splitString && isString(this) ? this.split('') : object;
                var length = self.length >>> 0;

                // If no callback function or if callback is not a callable function
                if (!isCallable(callbackfn)) {
                    throw new TypeError('Array.prototype.reduce callback must be a function');
                }

                // no value to return if no initial value and an empty array
                if (length === 0 && arguments.length === 1) {
                    throw new TypeError('reduce of empty array with no initial value');
                }

                var i = 0;
                var result;
                if (arguments.length >= 2) {
                    result = arguments[1];
                } else {
                    do {
                        if (i in self) {
                            result = self[i++];
                            break;
                        }

                        // if array contains no values, no initial value to return
                        if (++i >= length) {
                            throw new TypeError('reduce of empty array with no initial value');
                        }
                    } while (true);
                }

                for (; i < length; i++) {
                    if (i in self) {
                        result = callbackfn(result, self[i], i, object);
                    }
                }

                return result;
            }
        }, !reduceCoercesToObject);

        // ES5 15.4.4.22
        // http://es5.github.com/#x15.4.4.22
        // https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduceRight
        var reduceRightCoercesToObject = false;
        if (ArrayPrototype.reduceRight) {
            reduceRightCoercesToObject = typeof ArrayPrototype.reduceRight.call('es5', function(_, __, ___, list) {
                return list;
            }) === 'object';
        }
        defineProperties(ArrayPrototype, {
            reduceRight: function reduceRight(callbackfn /*, initial*/ ) {
                var object = ES.ToObject(this);
                var self = splitString && isString(this) ? this.split('') : object;
                var length = self.length >>> 0;

                // If no callback function or if callback is not a callable function
                if (!isCallable(callbackfn)) {
                    throw new TypeError('Array.prototype.reduceRight callback must be a function');
                }

                // no value to return if no initial value, empty array
                if (length === 0 && arguments.length === 1) {
                    throw new TypeError('reduceRight of empty array with no initial value');
                }

                var result;
                var i = length - 1;
                if (arguments.length >= 2) {
                    result = arguments[1];
                } else {
                    do {
                        if (i in self) {
                            result = self[i--];
                            break;
                        }

                        // if array contains no values, no initial value to return
                        if (--i < 0) {
                            throw new TypeError('reduceRight of empty array with no initial value');
                        }
                    } while (true);
                }

                if (i < 0) {
                    return result;
                }

                do {
                    if (i in self) {
                        result = callbackfn(result, self[i], i, object);
                    }
                } while (i--);

                return result;
            }
        }, !reduceRightCoercesToObject);

        // ES5 15.4.4.14
        // http://es5.github.com/#x15.4.4.14
        // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
        var hasFirefox2IndexOfBug = Array.prototype.indexOf && [0, 1].indexOf(1, 2) !== -1;
        defineProperties(ArrayPrototype, {
            indexOf: function indexOf(searchElement /*, fromIndex */ ) {
                var self = splitString && isString(this) ? this.split('') : ES.ToObject(this);
                var length = self.length >>> 0;

                if (length === 0) {
                    return -1;
                }

                var i = 0;
                if (arguments.length > 1) {
                    i = ES.ToInteger(arguments[1]);
                }

                // handle negative indices
                i = i >= 0 ? i : Math.max(0, length + i);
                for (; i < length; i++) {
                    if (i in self && self[i] === searchElement) {
                        return i;
                    }
                }
                return -1;
            }
        }, hasFirefox2IndexOfBug);

        // ES5 15.4.4.15
        // http://es5.github.com/#x15.4.4.15
        // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/lastIndexOf
        var hasFirefox2LastIndexOfBug = Array.prototype.lastIndexOf && [0, 1].lastIndexOf(0, -3) !== -1;
        defineProperties(ArrayPrototype, {
            lastIndexOf: function lastIndexOf(searchElement /*, fromIndex */ ) {
                var self = splitString && isString(this) ? this.split('') : ES.ToObject(this);
                var length = self.length >>> 0;

                if (length === 0) {
                    return -1;
                }
                var i = length - 1;
                if (arguments.length > 1) {
                    i = Math.min(i, ES.ToInteger(arguments[1]));
                }
                // handle negative indices
                i = i >= 0 ? i : length - Math.abs(i);
                for (; i >= 0; i--) {
                    if (i in self && searchElement === self[i]) {
                        return i;
                    }
                }
                return -1;
            }
        }, hasFirefox2LastIndexOfBug);

        //
        // Object
        // ======
        //

        // ES5 15.2.3.14
        // http://es5.github.com/#x15.2.3.14

        // http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation
        var hasDontEnumBug = !({ 'toString': null }).propertyIsEnumerable('toString'),
            hasProtoEnumBug = function() {}.propertyIsEnumerable('prototype'),
            hasStringEnumBug = !owns('x', '0'),
            dontEnums = [
                'toString',
                'toLocaleString',
                'valueOf',
                'hasOwnProperty',
                'isPrototypeOf',
                'propertyIsEnumerable',
                'constructor'
            ],
            dontEnumsLength = dontEnums.length;

        defineProperties(Object, {
            keys: function keys(object) {
                var isFn = isCallable(object),
                    isArgs = isArguments(object),
                    isObject = object !== null && typeof object === 'object',
                    isStr = isObject && isString(object);

                if (!isObject && !isFn && !isArgs) {
                    throw new TypeError('Object.keys called on a non-object');
                }

                var theKeys = [];
                var skipProto = hasProtoEnumBug && isFn;
                if ((isStr && hasStringEnumBug) || isArgs) {
                    for (var i = 0; i < object.length; ++i) {
                        theKeys.push(String(i));
                    }
                }

                if (!isArgs) {
                    for (var name in object) {
                        if (!(skipProto && name === 'prototype') && owns(object, name)) {
                            theKeys.push(String(name));
                        }
                    }
                }

                if (hasDontEnumBug) {
                    var ctor = object.constructor,
                        skipConstructor = ctor && ctor.prototype === object;
                    for (var j = 0; j < dontEnumsLength; j++) {
                        var dontEnum = dontEnums[j];
                        if (!(skipConstructor && dontEnum === 'constructor') && owns(object, dontEnum)) {
                            theKeys.push(dontEnum);
                        }
                    }
                }
                return theKeys;
            }
        });

        var keysWorksWithArguments = Object.keys && (function() {
            // Safari 5.0 bug
            return Object.keys(arguments).length === 2;
        }(1, 2));
        var originalKeys = Object.keys;
        defineProperties(Object, {
            keys: function keys(object) {
                if (isArguments(object)) {
                    return originalKeys(ArrayPrototype.slice.call(object));
                } else {
                    return originalKeys(object);
                }
            }
        }, !keysWorksWithArguments);

        //
        // Date
        // ====
        //

        // ES5 15.9.5.43
        // http://es5.github.com/#x15.9.5.43
        // This function returns a String value represent the instance in time
        // represented by this Date object. The format of the String is the Date Time
        // string format defined in 15.9.1.15. All fields are present in the String.
        // The time zone is always UTC, denoted by the suffix Z. If the time value of
        // this object is not a finite Number a RangeError exception is thrown.
        var negativeDate = -62198755200000;
        var negativeYearString = '-000001';
        var hasNegativeDateBug = Date.prototype.toISOString && new Date(negativeDate).toISOString().indexOf(negativeYearString) === -1;

        defineProperties(Date.prototype, {
            toISOString: function toISOString() {
                var result, length, value, year, month;
                if (!isFinite(this)) {
                    throw new RangeError('Date.prototype.toISOString called on non-finite value.');
                }

                year = this.getUTCFullYear();

                month = this.getUTCMonth();
                // see https://github.com/es-shims/es5-shim/issues/111
                year += Math.floor(month / 12);
                month = (month % 12 + 12) % 12;

                // the date time string format is specified in 15.9.1.15.
                result = [month + 1, this.getUTCDate(), this.getUTCHours(), this.getUTCMinutes(), this.getUTCSeconds()];
                year = (
                    (year < 0 ? '-' : (year > 9999 ? '+' : '')) +
                    ('00000' + Math.abs(year)).slice((0 <= year && year <= 9999) ? -4 : -6)
                );

                length = result.length;
                while (length--) {
                    value = result[length];
                    // pad months, days, hours, minutes, and seconds to have two
                    // digits.
                    if (value < 10) {
                        result[length] = '0' + value;
                    }
                }
                // pad milliseconds to have three digits.
                return (
                    year + '-' + result.slice(0, 2).join('-') +
                    'T' + result.slice(2).join(':') + '.' +
                    ('000' + this.getUTCMilliseconds()).slice(-3) + 'Z'
                );
            }
        }, hasNegativeDateBug);

        // ES5 15.9.5.44
        // http://es5.github.com/#x15.9.5.44
        // This function provides a String representation of a Date object for use by
        // JSON.stringify (15.12.3).
        var dateToJSONIsSupported = (function() {
            try {
                return Date.prototype.toJSON &&
                    new Date(NaN).toJSON() === null &&
                    new Date(negativeDate).toJSON().indexOf(negativeYearString) !== -1 &&
                    Date.prototype.toJSON.call({ // generic
                        toISOString: function() {
                            return true;
                        }
                    });
            } catch (e) {
                return false;
            }
        }());
        if (!dateToJSONIsSupported) {
            Date.prototype.toJSON = function toJSON(key) {
                // When the toJSON method is called with argument key, the following
                // steps are taken:

                // 1.  Let O be the result of calling ToObject, giving it the this
                // value as its argument.
                // 2. Let tv be ES.ToPrimitive(O, hint Number).
                var O = Object(this);
                var tv = ES.ToPrimitive(O);
                // 3. If tv is a Number and is not finite, return null.
                if (typeof tv === 'number' && !isFinite(tv)) {
                    return null;
                }
                // 4. Let toISO be the result of calling the [[Get]] internal method of
                // O with argument "toISOString".
                var toISO = O.toISOString;
                // 5. If IsCallable(toISO) is false, throw a TypeError exception.
                if (!isCallable(toISO)) {
                    throw new TypeError('toISOString property is not callable');
                }
                // 6. Return the result of calling the [[Call]] internal method of
                //  toISO with O as the this value and an empty argument list.
                return toISO.call(O);

                // NOTE 1 The argument is ignored.

                // NOTE 2 The toJSON function is intentionally generic; it does not
                // require that its this value be a Date object. Therefore, it can be
                // transferred to other kinds of objects for use as a method. However,
                // it does require that any such object have a toISOString method. An
                // object is free to use the argument key to filter its
                // stringification.
            };
        }

        // ES5 15.9.4.2
        // http://es5.github.com/#x15.9.4.2
        // based on work shared by Daniel Friesen (dantman)
        // http://gist.github.com/303249
        var supportsExtendedYears = Date.parse('+033658-09-27T01:46:40.000Z') === 1e15;
        var acceptsInvalidDates = !isNaN(Date.parse('2012-04-04T24:00:00.500Z')) || !isNaN(Date.parse('2012-11-31T23:59:59.000Z')) || !isNaN(Date.parse('2012-12-31T23:59:60.000Z'));
        var doesNotParseY2KNewYear = isNaN(Date.parse('2000-01-01T00:00:00.000Z'));
        if (!Date.parse || doesNotParseY2KNewYear || acceptsInvalidDates || !supportsExtendedYears) {
            // XXX global assignment won't work in embeddings that use
            // an alternate object for the context.
            /*global Date: true */
            /*eslint-disable no-undef*/
            Date = (function(NativeDate) {
                /*eslint-enable no-undef*/
                // Date.length === 7
                var DateShim = function Date(Y, M, D, h, m, s, ms) {
                    var length = arguments.length;
                    var date;
                    if (this instanceof NativeDate) {
                        date = length === 1 && String(Y) === Y ? // isString(Y)
                            // We explicitly pass it through parse:
                            new NativeDate(DateShim.parse(Y)) :
                            // We have to manually make calls depending on argument
                            // length here
                            length >= 7 ? new NativeDate(Y, M, D, h, m, s, ms) :
                            length >= 6 ? new NativeDate(Y, M, D, h, m, s) :
                            length >= 5 ? new NativeDate(Y, M, D, h, m) :
                            length >= 4 ? new NativeDate(Y, M, D, h) :
                            length >= 3 ? new NativeDate(Y, M, D) :
                            length >= 2 ? new NativeDate(Y, M) :
                            length >= 1 ? new NativeDate(Y) :
                            new NativeDate();
                    } else {
                        date = NativeDate.apply(this, arguments);
                    }
                    // Prevent mixups with unfixed Date object
                    defineProperties(date, { constructor: DateShim }, true);
                    return date;
                };

                // 15.9.1.15 Date Time String Format.
                var isoDateExpression = new RegExp('^' +
                    '(\\d{4}|[+-]\\d{6})' + // four-digit year capture or sign +
                    // 6-digit extended year
                    '(?:-(\\d{2})' + // optional month capture
                    '(?:-(\\d{2})' + // optional day capture
                    '(?:' + // capture hours:minutes:seconds.milliseconds
                    'T(\\d{2})' + // hours capture
                    ':(\\d{2})' + // minutes capture
                    '(?:' + // optional :seconds.milliseconds
                    ':(\\d{2})' + // seconds capture
                    '(?:(\\.\\d{1,}))?' + // milliseconds capture
                    ')?' +
                    '(' + // capture UTC offset component
                    'Z|' + // UTC capture
                    '(?:' + // offset specifier +/-hours:minutes
                    '([-+])' + // sign capture
                    '(\\d{2})' + // hours offset capture
                    ':(\\d{2})' + // minutes offset capture
                    ')' +
                    ')?)?)?)?' +
                    '$');

                var months = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365];

                var dayFromMonth = function dayFromMonth(year, month) {
                    var t = month > 1 ? 1 : 0;
                    return (
                        months[month] +
                        Math.floor((year - 1969 + t) / 4) -
                        Math.floor((year - 1901 + t) / 100) +
                        Math.floor((year - 1601 + t) / 400) +
                        365 * (year - 1970)
                    );
                };

                var toUTC = function toUTC(t) {
                    return Number(new NativeDate(1970, 0, 1, 0, 0, 0, t));
                };

                // Copy any custom methods a 3rd party library may have added
                for (var key in NativeDate) {
                    if (owns(NativeDate, key)) {
                        DateShim[key] = NativeDate[key];
                    }
                }

                // Copy "native" methods explicitly; they may be non-enumerable
                defineProperties(DateShim, {
                    now: NativeDate.now,
                    UTC: NativeDate.UTC
                }, true);
                DateShim.prototype = NativeDate.prototype;
                defineProperties(DateShim.prototype, {
                    constructor: DateShim
                }, true);

                // Upgrade Date.parse to handle simplified ISO 8601 strings
                DateShim.parse = function parse(string) {
                    var match = isoDateExpression.exec(string);
                    if (match) {
                        // parse months, days, hours, minutes, seconds, and milliseconds
                        // provide default values if necessary
                        // parse the UTC offset component
                        var year = Number(match[1]),
                            month = Number(match[2] || 1) - 1,
                            day = Number(match[3] || 1) - 1,
                            hour = Number(match[4] || 0),
                            minute = Number(match[5] || 0),
                            second = Number(match[6] || 0),
                            millisecond = Math.floor(Number(match[7] || 0) * 1000),
                            // When time zone is missed, local offset should be used
                            // (ES 5.1 bug)
                            // see https://bugs.ecmascript.org/show_bug.cgi?id=112
                            isLocalTime = Boolean(match[4] && !match[8]),
                            signOffset = match[9] === '-' ? 1 : -1,
                            hourOffset = Number(match[10] || 0),
                            minuteOffset = Number(match[11] || 0),
                            result;
                        if (
                            hour < (
                                minute > 0 || second > 0 || millisecond > 0 ?
                                24 : 25
                            ) &&
                            minute < 60 && second < 60 && millisecond < 1000 &&
                            month > -1 && month < 12 && hourOffset < 24 &&
                            minuteOffset < 60 && // detect invalid offsets
                            day > -1 &&
                            day < (
                                dayFromMonth(year, month + 1) -
                                dayFromMonth(year, month)
                            )
                        ) {
                            result = (
                                (dayFromMonth(year, month) + day) * 24 +
                                hour +
                                hourOffset * signOffset
                            ) * 60;
                            result = (
                                (result + minute + minuteOffset * signOffset) * 60 +
                                second
                            ) * 1000 + millisecond;
                            if (isLocalTime) {
                                result = toUTC(result);
                            }
                            if (-8.64e15 <= result && result <= 8.64e15) {
                                return result;
                            }
                        }
                        return NaN;
                    }
                    return NativeDate.parse.apply(this, arguments);
                };

                return DateShim;
            }(Date));
            /*global Date: false */
        }

        // ES5 15.9.4.4
        // http://es5.github.com/#x15.9.4.4
        if (!Date.now) {
            Date.now = function now() {
                return new Date().getTime();
            };
        }

        //
        // Number
        // ======
        //

        // ES5.1 15.7.4.5
        // http://es5.github.com/#x15.7.4.5
        var hasToFixedBugs = NumberPrototype.toFixed && (
            (0.00008).toFixed(3) !== '0.000' ||
            (0.9).toFixed(0) !== '1' ||
            (1.255).toFixed(2) !== '1.25' ||
            (1000000000000000128).toFixed(0) !== '1000000000000000128'
        );

        var toFixedHelpers = {
            base: 1e7,
            size: 6,
            data: [0, 0, 0, 0, 0, 0],
            multiply: function multiply(n, c) {
                var i = -1;
                var c2 = c;
                while (++i < toFixedHelpers.size) {
                    c2 += n * toFixedHelpers.data[i];
                    toFixedHelpers.data[i] = c2 % toFixedHelpers.base;
                    c2 = Math.floor(c2 / toFixedHelpers.base);
                }
            },
            divide: function divide(n) {
                var i = toFixedHelpers.size,
                    c = 0;
                while (--i >= 0) {
                    c += toFixedHelpers.data[i];
                    toFixedHelpers.data[i] = Math.floor(c / n);
                    c = (c % n) * toFixedHelpers.base;
                }
            },
            numToString: function numToString() {
                var i = toFixedHelpers.size;
                var s = '';
                while (--i >= 0) {
                    if (s !== '' || i === 0 || toFixedHelpers.data[i] !== 0) {
                        var t = String(toFixedHelpers.data[i]);
                        if (s === '') {
                            s = t;
                        } else {
                            s += '0000000'.slice(0, 7 - t.length) + t;
                        }
                    }
                }
                return s;
            },
            pow: function pow(x, n, acc) {
                return (n === 0 ? acc : (n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc)));
            },
            log: function log(x) {
                var n = 0;
                var x2 = x;
                while (x2 >= 4096) {
                    n += 12;
                    x2 /= 4096;
                }
                while (x2 >= 2) {
                    n += 1;
                    x2 /= 2;
                }
                return n;
            }
        };

        defineProperties(NumberPrototype, {
            toFixed: function toFixed(fractionDigits) {
                var f, x, s, m, e, z, j, k;

                // Test for NaN and round fractionDigits down
                f = Number(fractionDigits);
                f = f !== f ? 0 : Math.floor(f);

                if (f < 0 || f > 20) {
                    throw new RangeError('Number.toFixed called with invalid number of decimals');
                }

                x = Number(this);

                // Test for NaN
                if (x !== x) {
                    return 'NaN';
                }

                // If it is too big or small, return the string value of the number
                if (x <= -1e21 || x >= 1e21) {
                    return String(x);
                }

                s = '';

                if (x < 0) {
                    s = '-';
                    x = -x;
                }

                m = '0';

                if (x > 1e-21) {
                    // 1e-21 < x < 1e21
                    // -70 < log2(x) < 70
                    e = toFixedHelpers.log(x * toFixedHelpers.pow(2, 69, 1)) - 69;
                    z = (e < 0 ? x * toFixedHelpers.pow(2, -e, 1) : x / toFixedHelpers.pow(2, e, 1));
                    z *= 0x10000000000000; // Math.pow(2, 52);
                    e = 52 - e;

                    // -18 < e < 122
                    // x = z / 2 ^ e
                    if (e > 0) {
                        toFixedHelpers.multiply(0, z);
                        j = f;

                        while (j >= 7) {
                            toFixedHelpers.multiply(1e7, 0);
                            j -= 7;
                        }

                        toFixedHelpers.multiply(toFixedHelpers.pow(10, j, 1), 0);
                        j = e - 1;

                        while (j >= 23) {
                            toFixedHelpers.divide(1 << 23);
                            j -= 23;
                        }

                        toFixedHelpers.divide(1 << j);
                        toFixedHelpers.multiply(1, 1);
                        toFixedHelpers.divide(2);
                        m = toFixedHelpers.numToString();
                    } else {
                        toFixedHelpers.multiply(0, z);
                        toFixedHelpers.multiply(1 << (-e), 0);
                        m = toFixedHelpers.numToString() + '0.00000000000000000000'.slice(2, 2 + f);
                    }
                }

                if (f > 0) {
                    k = m.length;

                    if (k <= f) {
                        m = s + '0.0000000000000000000'.slice(0, f - k + 2) + m;
                    } else {
                        m = s + m.slice(0, k - f) + '.' + m.slice(k - f);
                    }
                } else {
                    m = s + m;
                }

                return m;
            }
        }, hasToFixedBugs);

        //
        // String
        // ======
        //

        // ES5 15.5.4.14
        // http://es5.github.com/#x15.5.4.14

        // [bugfix, IE lt 9, firefox 4, Konqueror, Opera, obscure browsers]
        // Many browsers do not split properly with regular expressions or they
        // do not perform the split correctly under obscure conditions.
        // See http://blog.stevenlevithan.com/archives/cross-browser-split
        // I've tested in many browsers and this seems to cover the deviant ones:
        //    'ab'.split(/(?:ab)*/) should be ["", ""], not [""]
        //    '.'.split(/(.?)(.?)/) should be ["", ".", "", ""], not ["", ""]
        //    'tesst'.split(/(s)*/) should be ["t", undefined, "e", "s", "t"], not
        //       [undefined, "t", undefined, "e", ...]
        //    ''.split(/.?/) should be [], not [""]
        //    '.'.split(/()()/) should be ["."], not ["", "", "."]

        var string_split = StringPrototype.split;
        if (
            'ab'.split(/(?:ab)*/).length !== 2 ||
            '.'.split(/(.?)(.?)/).length !== 4 ||
            'tesst'.split(/(s)*/)[1] === 't' ||
            'test'.split(/(?:)/, -1).length !== 4 ||
            ''.split(/.?/).length ||
            '.'.split(/()()/).length > 1
        ) {
            (function() {
                var compliantExecNpcg = typeof(/()??/).exec('')[1] === 'undefined'; // NPCG: nonparticipating capturing group

                StringPrototype.split = function(separator, limit) {
                    var string = this;
                    if (typeof separator === 'undefined' && limit === 0) {
                        return [];
                    }

                    // If `separator` is not a regex, use native split
                    if (!isRegex(separator)) {
                        return string_split.call(this, separator, limit);
                    }

                    var output = [];
                    var flags = (separator.ignoreCase ? 'i' : '') +
                        (separator.multiline ? 'm' : '') +
                        (separator.extended ? 'x' : '') + // Proposed for ES6
                        (separator.sticky ? 'y' : ''), // Firefox 3+
                        lastLastIndex = 0,
                        // Make `global` and avoid `lastIndex` issues by working with a copy
                        separator2, match, lastIndex, lastLength;
                    var separatorCopy = new RegExp(separator.source, flags + 'g');
                    string += ''; // Type-convert
                    if (!compliantExecNpcg) {
                        // Doesn't need flags gy, but they don't hurt
                        separator2 = new RegExp('^' + separatorCopy.source + '$(?!\\s)', flags);
                    }
                    /* Values for `limit`, per the spec:
                     * If undefined: 4294967295 // Math.pow(2, 32) - 1
                     * If 0, Infinity, or NaN: 0
                     * If positive number: limit = Math.floor(limit); if (limit > 4294967295) limit -= 4294967296;
                     * If negative number: 4294967296 - Math.floor(Math.abs(limit))
                     * If other: Type-convert, then use the above rules
                     */
                    var splitLimit = typeof limit === 'undefined' ?
                        -1 >>> 0 : // Math.pow(2, 32) - 1
                        ES.ToUint32(limit);
                    match = separatorCopy.exec(string);
                    while (match) {
                        // `separatorCopy.lastIndex` is not reliable cross-browser
                        lastIndex = match.index + match[0].length;
                        if (lastIndex > lastLastIndex) {
                            output.push(string.slice(lastLastIndex, match.index));
                            // Fix browsers whose `exec` methods don't consistently return `undefined` for
                            // nonparticipating capturing groups
                            if (!compliantExecNpcg && match.length > 1) {
                                /*eslint-disable no-loop-func */
                                match[0].replace(separator2, function() {
                                    for (var i = 1; i < arguments.length - 2; i++) {
                                        if (typeof arguments[i] === 'undefined') {
                                            match[i] = void 0;
                                        }
                                    }
                                });
                                /*eslint-enable no-loop-func */
                            }
                            if (match.length > 1 && match.index < string.length) {
                                array_push.apply(output, match.slice(1));
                            }
                            lastLength = match[0].length;
                            lastLastIndex = lastIndex;
                            if (output.length >= splitLimit) {
                                break;
                            }
                        }
                        if (separatorCopy.lastIndex === match.index) {
                            separatorCopy.lastIndex++; // Avoid an infinite loop
                        }
                        match = separatorCopy.exec(string);
                    }
                    if (lastLastIndex === string.length) {
                        if (lastLength || !separatorCopy.test('')) {
                            output.push('');
                        }
                    } else {
                        output.push(string.slice(lastLastIndex));
                    }
                    return output.length > splitLimit ? output.slice(0, splitLimit) : output;
                };
            }());

            // [bugfix, chrome]
            // If separator is undefined, then the result array contains just one String,
            // which is the this value (converted to a String). If limit is not undefined,
            // then the output array is truncated so that it contains no more than limit
            // elements.
            // "0".split(undefined, 0) -> []
        } else if ('0'.split(void 0, 0).length) {
            StringPrototype.split = function split(separator, limit) {
                if (typeof separator === 'undefined' && limit === 0) {
                    return [];
                }
                return string_split.call(this, separator, limit);
            };
        }

        var str_replace = StringPrototype.replace;
        var replaceReportsGroupsCorrectly = (function() {
            var groups = [];
            'x'.replace(/x(.)?/g, function(match, group) {
                groups.push(group);
            });
            return groups.length === 1 && typeof groups[0] === 'undefined';
        }());

        if (!replaceReportsGroupsCorrectly) {
            StringPrototype.replace = function replace(searchValue, replaceValue) {
                var isFn = isCallable(replaceValue);
                var hasCapturingGroups = isRegex(searchValue) && (/\)[*?]/).test(searchValue.source);
                if (!isFn || !hasCapturingGroups) {
                    return str_replace.call(this, searchValue, replaceValue);
                } else {
                    var wrappedReplaceValue = function(match) {
                        var length = arguments.length;
                        var originalLastIndex = searchValue.lastIndex;
                        searchValue.lastIndex = 0;
                        var args = searchValue.exec(match) || [];
                        searchValue.lastIndex = originalLastIndex;
                        args.push(arguments[length - 2], arguments[length - 1]);
                        return replaceValue.apply(this, args);
                    };
                    return str_replace.call(this, searchValue, wrappedReplaceValue);
                }
            };
        }

        // ECMA-262, 3rd B.2.3
        // Not an ECMAScript standard, although ECMAScript 3rd Edition has a
        // non-normative section suggesting uniform semantics and it should be
        // normalized across all browsers
        // [bugfix, IE lt 9] IE < 9 substr() with negative value not working in IE
        var string_substr = StringPrototype.substr;
        var hasNegativeSubstrBug = ''.substr && '0b'.substr(-1) !== 'b';
        defineProperties(StringPrototype, {
            substr: function substr(start, length) {
                var normalizedStart = start;
                if (start < 0) {
                    normalizedStart = Math.max(this.length + start, 0);
                }
                return string_substr.call(this, normalizedStart, length);
            }
        }, hasNegativeSubstrBug);

        // ES5 15.5.4.20
        // whitespace from: http://es5.github.io/#x15.5.4.20
        var ws = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003' +
            '\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028' +
            '\u2029\uFEFF';
        var zeroWidth = '\u200b';
        var wsRegexChars = '[' + ws + ']';
        var trimBeginRegexp = new RegExp('^' + wsRegexChars + wsRegexChars + '*');
        var trimEndRegexp = new RegExp(wsRegexChars + wsRegexChars + '*$');
        var hasTrimWhitespaceBug = StringPrototype.trim && (ws.trim() || !zeroWidth.trim());
        defineProperties(StringPrototype, {
            // http://blog.stevenlevithan.com/archives/faster-trim-javascript
            // http://perfectionkills.com/whitespace-deviations/
            trim: function trim() {
                if (typeof this === 'undefined' || this === null) {
                    throw new TypeError("can't convert " + this + ' to object');
                }
                return String(this).replace(trimBeginRegexp, '').replace(trimEndRegexp, '');
            }
        }, hasTrimWhitespaceBug);

        // ES-5 15.1.2.2
        if (parseInt(ws + '08') !== 8 || parseInt(ws + '0x16') !== 22) {
            /*global parseInt: true */
            parseInt = (function(origParseInt) {
                var hexRegex = /^0[xX]/;
                return function parseInt(str, radix) {
                    var string = String(str).trim();
                    var defaultedRadix = Number(radix) || (hexRegex.test(string) ? 16 : 10);
                    return origParseInt(string, defaultedRadix);
                };
            }(parseInt));
        }

    })(this);