@dansup @loops so, the immediately obvious way to do this is to make sure the username isn't in the actor ID or any object IDs. Then, you can set whatever you want as the `preferredUsername`, and changing it won't change the ID for the actor. I think the only problem is that some systems, like Mastodon, favour the Webfinger ID over the actor ID.

We're talking about this at the CG: https://github.com/swicg/activitypub-webfinger/issues/10