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feat(Symbol.observable): is no longer polyfilled #3387
btw I think these symbols are no longer publicly exported except for in the UMD build. Which one is intended?
I'm not entirely sure if we should be exporting any of them. If we did, seems like
I can see a possible argument about allowing libraries that use RxJS to add support for
BREAKING CHANGE: RxJS will no longer be polyfilling Symbol.observable. That should be done by an actual polyfill library. This is to prevent duplication of code, and also to prevent having modules with side-effects in rxjs.