[issue31671] IntFlag makes re.compile slower

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

Instead caching type(flags), how about this?

  if not isinstance(flags, int):
      raise TypeError(f"flags must be int or RegexFlag, got {flags!r}")
  flags = int(flags)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31671>
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