Damn! I really enjoyed Swift Playgrounds on the iPad, but found the lack of real keyboard irritating. I was about to download this until I saw your comment.
My email's too important to risk upgrading to Catalina still.
I've heard there were data store migration problems and haven't had any myself, but is this even an issue if you're using IMAP? It's all stored on the server anyways. (I can't imagine using POP in this age of multiple devices.)
Yep, definitely an issue with IMAP mailboxes. It's not a storm-in-a-teacup-because-it's-Apple situation, it's an Apple-really-done-fucked-up situation.
My email's too important to risk upgrading to Catalina still.