Is there a library which implements new Javascript/Ecmascript 5 methods for older versions?

Although [Ecmascript 5][1] introduces some completely new features, it also adds some new methods (bind, trim, map, etc.) which should be perfectly possible to implement (albeit slower) in current versions. Does a library exist which implements these backwards compatible features (and no more, excluding Prototype et. al.) [1]: http://www.ecma-international.org/publications/standards/Ecma-262.htm

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