No, but I read "POSIX norms" as what commonly happens on Unix systems: the filenames you get back are what you put into it. Most of them don't concern over cha

No, but I read "POSIX norms" as what commonly happens on Unix systems: the filenames you get back are what you put into it. Most of them don't concern over character encoding and UTF-8 sequences are just as-is. ZFS is again the special case, the normalization property will normalize names on lookup (they are stored as-is).