> For example, one might think int64_t is an alias for __int64 in the Microsoft stdint.h, but its "typedef long long" instead.

FWIW, __int64 is the same type as long long (i.e. std::is_same_v<__int64, long long> is true) on MSVC, although some may mistakenly think they are different types.

Thanks,

F.v.S.