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Drop IE 11 support by default

Merged Administrator requested to merge github/fork/Timer/feature/drop-ie-11-support into next

Created by: Timer

This drops IE 11 support by default. We no longer ship or use a polyfill entrypoint.

Introduces new package, react-app-polyfill, with entry points for ie9, ie11, and jsdom.

This also goes a step further and polyfills some things previously not polyfilled, i.e.:

  1. Symbol (used by for...of)
  2. Array.from (used by [...arr])

TODO:

  • verify Array.from is needed to perform array spread and not handled magically by babel somehow
  • add docs on IE 11/IE 9 support