Windows failure std::isnan(int32) is ambiguous

[Mizux]

This line won't compile on windows

or-tools/ortools/constraint_solver/routing_parameters.cc

Lines 313 to 317 in 5018149

	const int32 improvement_rate_solutions_distance =
	search_parameters.improvement_limit_parameters()
	.improvement_rate_solutions_distance();
	if (std::isnan(improvement_rate_solutions_distance) ||
	improvement_rate_solutions_distance <= 0) {

note, std::isnan should be defined for IntegralType

bool isnan( IntegralType arg ); | (4) | (since C++11)
4) A set of overloads or a function template accepting the arg argument of any integral type.
Equivalent to (2) (the argument is cast to double).

ref: https://en.cppreference.com/w/cpp/numeric/math/isnan

cl /std:c++17 /EHsc /MD /nologo -nologo  /D__WIN32__ /DPSAPI_VERSION=1 /DNOMINMAX /DWIN32_LEAN_AND_MEAN=1 /D_CRT_SECURE_NO_WARNINGS /O2 -DNDEBUG /I. /Iortools/gen /DUSE_GLOP /DUSE_BOP     /I"dependencies\\install\\include" /I"dependencies\\install\\include" /DGFLAGS_DLL_DECL= /DGFLAGS_DLL_DECLARE_FLAG= /DGFLAGS_DLL_DEFINE_FLAG= /I"dependencies\\install\\include" /DGOOGLE_GLOG_DLL_DECL= /I"dependencies\\install\\include" /I"dependencies\\install\\include" /I"dependencies\\install\\include" /I"dependencies\\install\\include\\coin" /I"dependencies\\install\\include" /I"dependencies\\install\\include\\coin" /I"dependencies\\install\\include" /I"dependencies\\install\\include\\coin" /DUSE_CLP /I"dependencies\\install\\include" /I"dependencies\\install\\include\\coin" /I"dependencies\\install\\include" /I"dependencies\\install\\include\\coin" /DUSE_CBC /I"dependencies\\install\\include" /DUSE_SCIP /DNO_CONFIG_HEADER  /DOR_TOOLS_MAJOR=8 /DOR_TOOLS_MINOR=0 -c .\\ortools\\constraint_solver\\routing_parameters.cc /Foobjs\\constraint_solver\\routing_parameters.obj
routing_parameters.cc
C:\Program Files (x86)\Windows Kits\10\include\10.0.19041.0\ucrt\corecrt_math.h(413): error C2668: 'fpclassify': ambiguous call to overloaded function
C:\Program Files (x86)\Windows Kits\10\include\10.0.19041.0\ucrt\corecrt_math.h(298): note: could be 'int fpclassify(long double) noexcept'
C:\Program Files (x86)\Windows Kits\10\include\10.0.19041.0\ucrt\corecrt_math.h(293): note: or       'int fpclassify(double) noexcept'
C:\Program Files (x86)\Windows Kits\10\include\10.0.19041.0\ucrt\corecrt_math.h(288): note: or       'int fpclassify(float) noexcept'
C:\Program Files (x86)\Windows Kits\10\include\10.0.19041.0\ucrt\corecrt_math.h(413): note: while trying to match the argument list '(_Ty)'
        with
        [
            _Ty=int32
        ]
.\ortools\constraint_solver\routing_parameters.cc(316): note: see reference to function template instantiation 'bool isnan<int32>(_Ty) noexcept' being compiled
        with
        [
            _Ty=int32
        ]
make: *** [makefiles/Makefile.gen.mk:4108: objs/constraint_solver/routing_parameters.obj] Error 2

I suggest to cast the int32 to double