[issue33533] Provide an async-generator version of as_completed

[Justin Arthur]

Justin Arthur <justinarthur at gmail.com> added the comment:

I've added a new PR, PR 22491. This one has as_completed returning an iterator and includes tests for both the old and new style.

I see a trivial amount of latency added in extra call stack over Guido's original implementation. Should we decide to deprecate the plain-iterator-of-awaitables form, we can possibly regain that latency in refactoring this as an asynchronous generator.

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