[issue28905] re.sub appears not to check count optional argument for integerness

[Danny Yoo]

Danny Yoo added the comment:

Ugh.  I suddenly realize that this is complicated by the fact that flag values are themselves represented as integers, and Python's type system isn't rich enough to label flag values as a distinct type for the purposes.

It may be worthwhile to add a warning in the documentation about this, as it is an easy mistake to make.

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<http://bugs.python.org/issue28905>
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