[issue20848] 3.4 cherry-pick: b637064cc696 Improve enum subclass behavior

[Ned Deily]

Ned Deily added the comment:

>>(I thought the change to not-automatically-getting-sphinx was deferred?)

(The not-automatically-getting-sphinx change is in the default branch but it has not been cherry-picked for 3.4.0 - and should not be, as agreed upon in Issue20661.)

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nosy: +ned.deily

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