To stay on the topic of Perl (for now), rather than which community to ask for help: yes, it's immensely tragic that the difference between utf8 and utf-8 (note: case insensitive!) is so subtle visually, but so important semantically. It's tragic not because such a subtle distinction would be bad per se (after all, + versus - is the same amount of visual difference but we've been perfectly capable of coping with that), but because UTF-8 is an identifier used also outside the Perl world, where utf8 and utf-8 generally mean the same thing.
But it's something we'll just have to get used to. One of the many historically defined quirks, that practically every language, whether programming or natural, has. It's documented and within this community fairly well known. Now if only indeed they'd just ask the Perl community for help, rather than that of Twitter... :).