Although Ecmascript 5 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.)
Although Ecmascript 5 introduces some completely new features, it also adds some new methods
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So, I just gave up and started an ES5 library