this post was submitted on 19 Aug 2024
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that'll be difficult. Lemmy killed interoperability when they first decided that users and groups could share the same username, and now itd be a breaking change in order to solve this on Lemmy's end.
each software willing to federate with Lemmy correctly needs to be modified to handle multiple "users" having the exact same username, and i suspect most have more important priorities to tackle before getting to that
(misskey 12 derived software also has their own interoperability bugs regarding Lemmy, but those are usually not as big of a refactor as the username thing)
Wait, what? Can a Lemmy instance have a /c/foo and /u/foo at the same time?
I haven't been keeping up on backend development so I didn't realise Lemmy made that change. That's a shame. Thanks for being so helpful though!
oh no that's not a new change afaik it was always like this
I'm fairly sure I was able to comment on Lemmy threads while experimenting with Firefish like a year ago - though it of course struggled with displaying threaded content.
that post will have been a text post, not a link (those are likely broken now, and certainly were broken a year ago due to a bug in the misskey 12 codebase inherited by firefish and forks. modern versions of misskey just fixed that a couple months ago)
the username thing does not completely break federation, but it will randomly confuse instances. there's a 50/50 chance whether an instance will get the correct user it asks or not, and once an instance resolves a user once it'll have a similar 50/50 chance for each profile update (icon change, sidebar change, etc.). of course, if there's no conflicting user for a community (or vice versa) then federation will be fine.
Ah, I see! Thanks for the explanation. I'd go back and check but firefish.social isn't around anymore.
It's really a shame since interoperability is such (theoretical) benefit of ActivityPub, but what can you do.
the specs are so open ended that i doubt real interoperability will ever happen. you can break interoperability with basically every other current software out there and still be compliant with the specs