One of the things I'm wanting to do is also implement some of the **planned** OAuth functionality for Mastodon in @hollo first to get a feel for how it works — I'm way better at writing typescript compared to ruby.

So things like Device Code Grant Flow for input constrained devices (sign-in to hollo on your TV or retro computer), or supporting access token expiration and Client ID Metadata Documents (which removes the need for a client to pre-register with a given server before doing an oauth flow).