is it ok to specialize std::numeric_limits for user-defined number-like classes?

Question

The documentation of std::numeric_limits says it should not be specialized for non-fundamental types. What about number-like user-defined types? If I

Answer 1

Just an example:

namespace std {
    template<> class numeric_limits {
    public:
       static Temperature lowest() {return Temperature(-273.15f);};
       // One can implement other methods if needed
    };
}