Function remove_sign

3rd/nlohmann_json/single_include/nlohmann/json.hpp:17333–17337

* Overload to make the compiler happy while it is instantiating * dump_integer for number_unsigned_t. * Must never be called. */

     * Must never be called.
     */
    number_unsigned_t remove_sign(number_unsigned_t x)
    {
        JSON_ASSERT(false); // NOLINT(cert-dcl03-c,hicpp-static-assert,misc-static-assert) LCOV_EXCL_LINE
        return x; // LCOV_EXCL_LINE
    }

    /*
     * Helper function for dump_integer