Ah, that's a really interesting approach. With JavaScript and Python, you re-run the code or re-start the server or refresh the page (there's no compile step),

Ah, that's a really interesting approach. With JavaScript and Python, you re-run the code or re-start the server or refresh the page (there's no compile step), but I've way too frequently run into type errors in project both small and large (but especially larger ones). I've also found it significantly harder to understand code written by other (i.e. to understand or know what the structure of objects being passed around is)--my solution often was to use a debugger and set a breakpoint and inspect the structure of the object (of course, this was experientially a lot more cumbersome than using a statically typed language), but is the idea with CL kind of similar, in that you sort of inspect the program while it runs, but you also have a JVM HotSwap like capability?