[3.10] bpo-44342: [Enum] changed pickling from by-value to by-name (GH-26658) #26660
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by-value lookups could fail on complex enums, necessitating a check for
reduce and possibly sabotaging the final enum;
by-name lookups should never fail, and sabotaging is no longer necessary
for class-based enum creation.
(cherry picked from commit 62f1d2b)
Co-authored-by: Ethan Furman ethan@stoneleaf.us
https://bugs.python.org/issue44342