std::is_same_v<decltype(0LL), int64_t> does not evaluate the same on
Linux Clang and MSVC. MSVC returns true but Clang and GCC both returns
false resulting in failing to read the game id from the XML file and
therefore rebuilding the cache.
Solution: Don't rely on the type of 0LL and 0ULL literals but explicitly
provide the type of the field we are trying to read.
