So in theory Mastodon v3.5.x now supports editing toots (I think?), with edit histories viewable, or at least stashed away in the db somewhere. I'll need to figure out how I should represent this in Mastowidget.
The upshot of this is you'll likely see a few pointless, edited posts here once I start futzing about with that (and I think once the UI actually exists?). I should really make a decoy testing account at some point. That point is not now.