bpo-45331: add rule to docs that Enum
mixin type must be subclassable
#30521
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In my practice I got hit by it, when tried
bool
as a mixin type.Probably this small note can help to describe this problem better.
I am going to add
skip-news
as a doc-only change.CC @corona10 as my mentor.
https://bugs.python.org/issue45331