https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95832
--- Comment #1 from fiesh at zefix dot tv --- https://en.cppreference.com/w/cpp/utility/variant/variant says that "If T_i is (possibly cv-qualified) bool, F(T_i) is only considered if std::decay_t<T> (until C++20)std::remove_cvref_t<T> (since C++20) is also bool" which would mean 0 is the correct return value. But I can't find anything like this in http://eel.is/c++draft/variant
