[libcxx-commits] [libcxx] [libc++] Fix acceptance of convertible-to-{float, double, long double} in std::isfinite() (PR #98841)

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AngryLoki wrote:

Fails in gcc test... Looks like std::isnan `_LIBCPP_PREFERRED_OVERLOAD` also never worked in gcc too and it was not covered with tests. I guess it is possible to implement in in gcc (https://godbolt.org/z/vcrGWzcvj). But I don't know if this level of complication is needed. libstdc++ has no such thing as "preferred overload" and just fails with `call to 'isfinite' is ambiguous` when there are multiple user-defined conversion functions.

https://github.com/llvm/llvm-project/pull/98841