Trying to do more async reviews outside of Committee meetings, so that means my review here is not binding by any means. Just giving my (often naive) take.

Right now, I'm okay with $! and the new ProcessId property, but I have concerns about console overlays, as well as the change to --% (which I don't believe can be easily implemented, though I'd love to be proven wrong). I think we should document workarounds (inline in my comments) around the --% scenario.