[issue41756] Do not always use exceptions to return result from coroutine

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I agree that we should add PyIter_Send() (the name is discussable, but PyIter_Send LGTM) which should support iterators and objects with the send() method. It would be much more useful for user, and can replace PyGen_Send() in the interpreter core code. But merging the PR with PyGen_Send() was not a mistake. It was good to split the changes on smaller steps easier to review.

Vladimir, do you mind to create a new PR for PyIter_Send()? I seen its implementation in one of intermediate versions of your PR.

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<https://bugs.python.org/issue41756>
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