[issue44242] enum.IntFlag regression: missing values cause TypeError

[Ethan Furman]

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

Actually, thinking about that a little bit more, KEEP was added for exactly this situation, as some stdlib flags exhibit the same behavior.

So the real question is what should happen with, for example,

  GeodIntermediateFlag(0x80)

?

The idea behind boundary is what should happen when values are created that don't have names in the Enum/Flag?  The options for boundary are:

STRICT  -> an error is raised  (default for Enum)
EJECT   -> the integer 0x80 is returned (not a flag)
CONFORM -> unnamed bits are discarded (so the DEFAULT flag would be returned)
KEEP    -> an unnamed flag with value 0x80 is returned

So KEEP is currently doing double-duty -- this reinforces my desire to go with option 2 and return KEEP to single-duty status.

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<https://bugs.python.org/issue44242>
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