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

[Vedran Čačić]

Vedran Čačić <vedgar at gmail.com> added the comment:

Again, I disagree. `str` used to work like this in Py2.0 (or somewhere around then), only 'x' was in 'xyz', not 'xy'. Then Guido came to his senses. :-)

This is not set theory, this is mereology. You don't differentiate between a digit and a one-digit number, a char and a one-char string, and in the same way you shouldn't differentiate between a bit and a one-bit flag.

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<https://bugs.python.org/issue38250>
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