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bpo-41517: do not allow Enums to be extended (#22271)

fix bug that let Enums be extended via multiple inheritance
E
Ethan Furman committed
3064dbf5df1021e85b507366a7ea448c8895efe7
Parent: 0705ec8
Committed by GitHub <noreply@github.com> on 9/16/2020, 2:11:57 PM