> I think there are some projects floating around out there, but I personally don't see a purpose for one. It's not python or matlab

I was thinking of a REPL in the sense of common Clojure usage (https://vvvvalvalval.github.io/posts/what-makes-a-good-repl....) not the basic "write lines into a separate program and then copy-paste it into your source code" that Python offers.