Nikita Popov 2414b3d775 Ensure ctype_string is NULL for C locale ...

We already document that this is the case, but currently it's only
true if setlocale() has not been called. Make sure ctype_string is
always NULL, even with an explicit "C" locale call, so we can
more efficiently check whether we are in the "C" locale.

Closes GH-5542.

2020-05-07 21:26:13 +02:00

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