On both Windows and unix some characters are disallowed in filenames (and as such in filepaths),
most notably NUL. Construction functions could check for these invariants?
- https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions
- https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_170
Yes.