mcc @mcc@mastodon.social
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Somebody linked me RFC 7565, which linked to RFC7564, and if that's the place to look this appears to be the list of disallowed characters in a Fediverse username, and I'm cracking up because it's *mostly* stuff you'd expect, except the very first category of banned characters, specially, is "pre-1700 Korean characters".

The fediverse is welcome to all. EXCEPT KOREAN TIME TRAVELERS. Did you just wake up from being frozen in ice during the Joseon dynasty? The IETF is targeting you PERSONALLY

4.2.3. Disallowed o Old Hangul Jamo characters, i.e., the OldHangulJamo ("I") category defined under Section 9.9. o Control characters, i.e., the Controls ("L") category defined under Section 9.12. o Ignorable characters, i.e., the PrecisIgnorableProperties ("M") category defined under Section 9.13. o Space characters, i.e., the Spaces ("N") category defined under Section 9.14. o Symbol characters, i.e., the Symbols ("O") category defined under Section 9.15. o Punctuation characters, i.e., the Punctuation ("P") category defined under Section 9.16. o Any character that has a compatibility equivalent, i.e., the HasCompat ("Q") category defined under Section 9.17. These code points are disallowed even if they would otherwise be valid according to the property-based rules specified in the previous section. o Letters and digits other than the "traditional" letters and digits allowed in IDNs, i.e., the OtherLetterDigits ("R") category defined under Section 9.18.
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