Remove polyfills for ES5 features #2
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This breaks compatibility with Internet Explorer 8 which is technically a breaking change but today the impact ought to be quite limited. IMO the added compatibility it not worth the bytes it uses. The polyfills are also quite easy to add for any users of this library.
Test are also already failing on IE8 without this change: https://ci.testling.com/substack/json-stable-stringify