Merge "Print AIDL 'char' values as numbers." into main

    if constexpr (std::is_same_v<bool, _T>) {

        return t ? "true" : "false";

    } else if constexpr (std::is_same_v<char16_t, _T>) {

        // TODO(b/244494451): codecvt is deprecated in C++17 -- suppress the

        // warnings. There's no replacement in the standard library yet.

        _Pragma("clang diagnostic push")

                _Pragma("clang diagnostic ignored \"-Wdeprecated-declarations\"");

        return std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>().to_bytes(t);

        _Pragma("clang diagnostic pop");

        // 'char' fields in AIDL are nearly always used for 16-bit numeric values.

        return std::to_string(static_cast<int>(t));

    } else if constexpr (std::is_arithmetic_v<_T>) {

        return std::to_string(t);

    } else if constexpr (std::is_same_v<std::string, _T>) {