[issue32218] add __iter__ to enum.Flag members

[Ethan Furman]

Change by Ethan Furman <ethan at stoneleaf.us>:


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keywords: +patch
pull_requests: +21276
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22221

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32218>
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