I'm not on twitter, but I do have a twitter account for my other project viztracer @viztracer. All my work is on my github if you are interested :)

watchpoints does not work in the REPL. REPL is a more complicated environment. I don't think pdb will work in REPL either.

watchpoints works very intuitively. It has some dirty magic that made it work in some way that you need but not expect.