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[3.12] gh-105332: [Enum] Fix unpickling flags in edge-cases (GH-105348) (GH-105520)

* revert enum pickling from by-name to by-value

(cherry picked from commit 4ff5690e591b7d11cf11e34bf61004e2ea58ab3c)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
M
Miss Islington (bot) committed
2f4a2d6c1b0c95f6be33a8c778b0212922a50530
Parent: 68eeab7
Committed by GitHub <noreply@github.com> on 6/9/2023, 1:01:51 AM