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+#es5-shim <sup>[![Version Badge][2]][1]</sup>
+
+[![npm badge][9]][1]
+
+[![Build Status][3]][4] [![dependency status][5]][6]  [![dev dependency status][7]][8]
+
+`es5-shim.js` and `es5-shim.min.js` monkey-patch a JavaScript context to
+contain all EcmaScript 5 methods that can be faithfully emulated with a
+legacy JavaScript engine.
+
+`es5-sham.js` and `es5-sham.min.js` monkey-patch other ES5 methods as
+closely as possible.  For these methods, as closely as possible to ES5
+is not very close.  Many of these shams are intended only to allow code
+to be written to ES5 without causing run-time errors in older engines.
+In many cases, this means that these shams cause many ES5 methods to
+silently fail.  Decide carefully whether this is what you want.
+
+
+## Tests
+
+The tests are written with the Jasmine BDD test framework.
+To run the tests, navigate to <root-folder>/tests/. 
+
+## Shims
+
+### Complete tests ###
+
+* Array.prototype.every
+* Array.prototype.filter
+* Array.prototype.forEach
+* Array.prototype.indexOf
+* Array.prototype.lastIndexOf
+* Array.prototype.map
+* Array.prototype.some
+* Array.prototype.reduce
+* Array.prototype.reduceRight
+* Array.isArray
+* Date.now
+* Date.prototype.toJSON
+* Function.prototype.bind
+    * :warning: Caveat: the bound function has a prototype property.
+    * :warning: Caveat: bound functions do not try too hard to keep you
+      from manipulating their ``arguments`` and ``caller`` properties.
+    * :warning: Caveat: bound functions don't have checks in ``call`` and
+      ``apply`` to avoid executing as a constructor.
+* Number.prototype.toFixed
+* Object.keys
+* String.prototype.split
+* String.prototype.trim
+* String.prototype.replace
+    * Firefox (through v29) natively handles capturing groups incorrectly.
+* Date.parse (for ISO parsing)
+* Date.prototype.toISOString
+* parseInt
+
+## Shams
+
+* :warning: Object.create
+
+    For the case of simply "begetting" an object that inherits
+    prototypically from another, this should work fine across legacy
+    engines.
+
+    :warning: Object.create(null) will work only in browsers that
+    support prototype assignment.  This creates an object that does not
+    have any properties inherited from Object.prototype.  It will
+    silently fail otherwise.
+
+    :warning: The second argument is passed to Object.defineProperties
+    which will probably fail either silently or with extreme predudice.
+
+* :warning: Object.getPrototypeOf
+
+    This will return "undefined" in some cases.  It uses `__proto__` if
+    it's available.  Failing that, it uses constructor.prototype, which
+    depends on the constructor property of the object's prototype having
+    not been replaced.  If your object was created like this, it won't
+    work:
+
+        function Foo() {
+        }
+        Foo.prototype = {};
+
+    Because the prototype reassignment destroys the constructor
+    property.
+
+    This will work for all objects that were created using
+    `Object.create` implemented with this library.
+
+* :warning: Object.getOwnPropertyNames
+
+    This method uses Object.keys, so it will not be accurate on legacy
+    engines.
+
+* Object.isSealed
+
+    Returns "false" in all legacy engines for all objects, which is
+    conveniently guaranteed to be accurate.
+
+* Object.isFrozen
+
+    Returns "false" in all legacy engines for all objects, which is
+    conveniently guaranteed to be accurate.
+
+* Object.isExtensible
+
+    Works like a charm, by trying very hard to extend the object then
+    redacting the extension.
+
+### May fail
+
+* :warning: Object.getOwnPropertyDescriptor
+
+    The behavior of this shim does not conform to ES5.  It should
+    probably not be used at this time, until its behavior has been
+    reviewed and been confirmed to be useful in legacy engines.
+
+* :warning: Object.defineProperty
+
+    In the worst of circumstances, IE 8 provides a version of this
+    method that only works on DOM objects.  This sham will not be
+    installed.  The given version of `defineProperty` will throw an
+    exception if used on non-DOM objects.
+
+    In slightly better circumstances, this method will silently fail to
+    set "writable", "enumerable", and "configurable" properties.
+
+    Providing a getter or setter with "get" or "set" on a descriptor
+    will silently fail on engines that lack "__defineGetter__" and
+    "__defineSetter__", which include all versions of IE.
+
+    https://github.com/es-shims/es5-shim/issues#issue/5
+
+* :warning: Object.defineProperties
+
+    This uses the Object.defineProperty shim
+
+* Object.seal
+
+    Silently fails on all legacy engines.  This should be
+    fine unless you are depending on the safety and security
+    provisions of this method, which you cannot possibly
+    obtain in legacy engines.
+
+* Object.freeze
+
+    Silently fails on all legacy engines.  This should be
+    fine unless you are depending on the safety and security
+    provisions of this method, which you cannot possibly
+    obtain in legacy engines.
+
+* Object.preventExtensions
+
+    Silently fails on all legacy engines.  This should be
+    fine unless you are depending on the safety and security
+    provisions of this method, which you cannot possibly
+    obtain in legacy engines.
+
+[1]: https://npmjs.org/package/es5-shim
+[2]: http://vb.teelaun.ch/es-shims/es5-shim.svg
+[3]: https://travis-ci.org/es-shims/es5-shim.png
+[4]: https://travis-ci.org/es-shims/es5-shim
+[5]: https://david-dm.org/es-shims/es5-shim.png
+[6]: https://david-dm.org/es-shims/es5-shim
+[7]: https://david-dm.org/es-shims/es5-shim/dev-status.png
+[8]: https://david-dm.org/es-shims/es5-shim#info=devDependencies
+[9]: https://nodei.co/npm/es5-shim.png?downloads=true&stars=true
+