Our tr, at least in 8, does not seem to implement the -C flag. Reading posix:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/tr.html I am a bit lost in a twisty maze of "value" vs "character", that I expect has something to do with multibyte characters. Can anyone explain where NetBSD is and might be going w.r.t. this specification?