[issue38250] enum.Flag should be more set-like

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

Thank you to everyone involved.  :-)

To answer the first three points that started this issue:

1. iteration -> each single-bit flag in the entire flag, or a
   combinations of flags, is returned one at a time -- not the
   empty set, not other multi-bit values

2. length is implemented -> `len(Color.BLUE | Color.RED) == 2`

3. subset is implemented as containment checking:
   `Color.BLUE in (Color.RED | Color.BLUE) is True`

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38250>
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