polyfill: Equality fix and faster performance #26
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In fbdd122 the sorting during construction was removed, but the equality function assumes the string keys are sorted, so the equality was not always correct.
This PR re-introduces sorting, but just for the string keys so symbols are still supported.
This PR adds some performance improvements by using
#privatefields instead ofWeakMapand also using a custom prototype for the internal helpers to be able to useMapandSetdirectly, instead of usingapplyto invoke their methods.