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Sounds good, but I don't think we can backport it. It's not _our_ public API, but it's still going to impact compiling modules.
Also, looking at the docs link above, copysign() is for floats and _copysign() is for doubles, which means it's an actual functional change. If POSIX/libc copysign() is floats, it's probably fine for a 3.10 change, but if we need to preserve the type then it needs to become _Py_copysign throughout.
Turns out a straight delete is fine, as both names are defined in UCRT. I think it's safe to backport as well, since it's only going to affect other people's code poorly (and they'll need to recompile to see any change anyway).