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

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

Mark, Stefan,

I don't want this to be stale so I propose to move with my suggestions:

1. We make the new API public. Mark, if you have objections to that - please elaborate with some details. IMO, the corresponding Python API is long public and there's no harm in exposing a C version of it. Especially given the fact that uvloop, cython, and even asyncio itself will be relying on that API.

2. I propose to name the new API `PyIter_Send`. Motivation: it will work with both generators and coroutines and plays nicely with `PyIter_Next`.

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