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bpo-41816: add `StrEnum` (GH-22337)

`StrEnum` ensures that its members were already strings, or intended to
be strings.
E
Ethan Furman committed
0063ff4e583505e69473caa978e476ea4c559b83
Parent: 68526fe
Committed by GitHub <noreply@github.com> on 9/22/2020, 12:23:13 AM