Ruby 3 does static typing, so that would be the quickest path for static types.

Crystal is interesting to me because its a systems language, using Ruby syntax and idioms.

I'm a Rails developer by trade but I've been pining to go back into desktop GUI development. Right now the only viable cross-platform options seem to be Swing and Electron. I'm not sure what the desktop story is with Crystal but if it there is a workable solution based on GTK or something similar I'd be very happy!