RFC: Do not include package-local polyfills. #1870
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This removes babel's core-js polyfills from the distributed NPM builds. This aids in further reducing app bundle size when targeting modern browsers, and allows flexibility in how these polyfills are provided if necessary, which can help fix React Native specific issues, as illustrated in #1799 and #1704 and #1818.
The drawback is that polyfills for these things are now something that client developers will need to think about directly. Shipping Relay to older browsers before this diff should work fine, but after this diff will require global polyfills. As such, this diff may constitute at least a minor-breaking change.