[docs] [issue34156] Nail down and document the behavior of range expressions in RE character classes

[Zack Weinberg]

Zack Weinberg <zackw at panix.com> added the comment:

Also, whether or not the current behavior is the intended behavior, I think programmers would appreciate an explicit statement of whether or not it might change in the future.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34156>
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