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I'm filing a Defect Report about std::format disrespecting locale as we speak.

How/where do you do that?

You send an email to the Library Working Group chair.

Of course, just because a defect is reported doesn't mean it'll get fixed, or that the fix will be of any use.

The most famous (technically a C defect) is probably DR#260: https://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_260.htm