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bpo-35474: Fix mimetypes.guess_all_extensions() potentially mutating list (GH-28286)

* Calling guess_all_extensions() with strict=False potentially
  mutated types_map_inv.
* Mutating the result of guess_all_extensions() mutated types_map_inv.
S
Serhiy Storchaka committed
97ea18ecede8bfd33d5ab2dd0e7e2aada2051111
Parent: 5f5b7d0
Committed by GitHub <noreply@github.com> on 9/11/2021, 2:44:44 PM