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- Backported from python 3.11:
- `enum.ReprEnum` to be used for new builtin-type enums.
- `enum.StrEnum` for enumerations where members are strings.
- `enum.IntEnum` and `enum.IntFlag` use now `__format__` and `__str__` from the builtins types.
- Defined `enum.TupleEnum` for enumerations where members are tuples.
- Constants defined: `colors.BGR` and `colors.RGB` from `enum.TupleEnum`.