https://twitter.com/davidcapello/status/1555286998440706048 @davidcapello @beast_pixels @aseprite I know there is always the fear of committing internal formats to disk but I think its reasonable to cease support of old undos if you need to.

IE allow breaking changes to bump the version and the undo will stop loading.

When it works, yay, when it doesn't, meh, no big deal.