operator<=>(std::optional<_Tp>,_Up) was underconstrained. _Up needs to fulfill std::three_way_comparable<_Tp>. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98842 and http://eel.is/c++draft/optional#comp.with.t-25.
operator<=>(std::optional<_Tp>,_Up) was underconstrained. _Up needs to fulfill std::three_way_comparable<_Tp>. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98842 and http://eel.is/c++draft/optional#comp.with.t-25.