"(The big one that always gets pointed out? '\' and '¥’.)” The point there though is that Japanese DON’T want \ and ¥ to map properly. They want \ and ¥ to be

"(The big one that always gets pointed out? '\' and '¥’.)” The point there though is that Japanese DON’T want \ and ¥ to map properly. They want \ and ¥ to be considered the same. So Unicode isn’t losing information, it’s forcing a distinction the Japanese don’t want to be able to make.