LC_CTYPE=UTF-8

[Hans Åberg]

MacOS sets as default LC_CTYPE=UTF-8, not appearing in the 'locale -a' list. 
Then some software interprets this as though the locale is C/POSIX, disregards 
the UTF-8 encoding, and converts all non-ASCII (high bit set) char's into octal 
escape sequences. What is the correct interpretation here?