Internationalisation of "handles" on the fediverse, fresh from #fediforum

@jdlh It does beget the question: how do you standardise to fix a problem in something you don't technically have? Handles are a design construct in the fediverse and not actually a protocol concept.

@thisismissem is a webfinger resource but doesn't appear in Actor objects, and is instead constructed from preferredUsername and the webfinger domain. Handles don't exist in ActivityPub, but almost all ActivityPub software has some concept of them.