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gh-118820: Zero-valued flag enum has no name (GH-118848)

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Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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Doc/howto/enum.rst
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@ -1152,6 +1152,14 @@ the following are true:
>>> (Color.RED | Color.GREEN).name
'RED|GREEN'
>>> class Perm(IntFlag):
... R = 4
... W = 2
... X = 1
...
>>> (Perm.R & Perm.W).name is None # effectively Perm(0)
True
- multi-bit flags, aka aliases, can be returned from operations::
>>> Color.RED | Color.BLUE