Overloads of std::isnan and std::isinf for integral types

Cppreference mentions the overloads of std::isnan and std::isinf (and maybe others) for integral types. This makes the following call unambiguous:

std::isnan(1);

However, I cannot find any such overloads mentioned in the C++ Standard. I checked C++11 and the current draft, and there are only overloads for float, double, and long double.

As for compiler behavior, GCC and Clang both compile the code, but MSVC does not. Who is right? Where did the integral overload on cppreference come from?