[issue31671] IntFlag makes re.compile slower

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

My PR 3867 fixes a corner case when the re.compile() is misused ("on purpose"?). I'm going to reject (abandon) my own PR since it makes re.compile() slower:

Mean +- std dev: [ref] 364 ns +- 6 ns -> [patch] 459 ns +- 10 ns: 1.26x slower (+26%)

@Serhiy, @Naoki: Are you ok to reject this PR and keep the corner case bug?

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