fix(observable): ensure the subscriber chain is complete before calling this._subscribe #1516
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Description:
If an operator subscriber completed (or unsubscribed) early after receiving values from a synchronous source, the subscribers upstream weren't disposed until after returning from the source's subscribe function. When any downstream subscriber unsubscribes, the upstream subscribers should be notified immediately and unsubscribe all the way to the source subscription.
Related issue (if exists):
@zenparsing pointed this out in #1513
cc: @Blesh