Method get_number_unsigned

native/thirdpart/json/json.hpp:8458–8461

return unsigned integer value

    /// return unsigned integer value
    constexpr number_unsigned_t get_number_unsigned() const noexcept
    {
        return value_unsigned;
    }

    /// return floating-point value
    constexpr number_float_t get_number_float() const noexcept