Error "expression did not evaluate to a constant" with latest MSVC 19.8.5

[Mario Emmenlauer]

With the latest master branch and latest MSVC 19.8.5, I get an error in the build:

C:\gitlabci\local\builds\U8oUWsz8\0\BioDataAnalysis\NamedType\test\tests.cpp(528,29): error C2131: expression did not evaluate to a constant
    static_assert((10_meter == 10_meter), "Comparable is not constexpr");
                            ^
C:\gitlabci\local\builds\U8oUWsz8\0\BioDataAnalysis\NamedType\include\NamedType\named_type_impl.hpp(83,16): note: failure was caused by attempting to access a member on an object of dynamic type 'fluent::Comparable<fluent::NamedType<unsigned __int64,MeterParameter,fluent::Addable,fluent::Comparable>>' in which the member is not defined
        return value_;
               ^
C:\gitlabci\local\builds\U8oUWsz8\0\BioDataAnalysis\NamedType\include\NamedType\named_type_impl.hpp(83,16): note: see usage of 'fluent::NamedType<unsigned __int64,MeterParameter,fluent::Addable,fluent::Comparable>::value_'
        return value_;

I think this test is originating from commit 1841331 "Adding constexpr for skill Comparable".

I have set a preprocessor define to enable explicit -std:c++17, but that should be ok, or not?