[issue22906] PEP 479: Change StopIteration handling inside generators

[Marc Schlaich]

Marc Schlaich added the comment:

AFAIS this would break all existing code for yield-based coroutine schedulers (Tornado, Twisted, Trollius, monocle, ...) when a coroutine is exited with `raise StopIteration` in client code. 

And this seems like a lot, a quick GitHub code search gives various examples, e.g.

- https://github.com/circus-tent/circus-web/blob/3b76c83d1eb984a78ed69a9abcb13054cde78f89/circusweb/circushttpd.py#L170
- https://github.com/kzahel/falcon-api/blob/5c62454db971bc99c52694cf2ce0613fb1504d80/python/falcon_api/session.py#L159
- https://github.com/peterhajas/Genesis/blob/2f1a03c38934b892ee6bb04e07e867bf463b7ae5/servers/genesis/clients.py#L24

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nosy: +schlamar

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