This looks like something Common Lisp does better, however I have too little Clojure experience to compare. CL (and SBCL in particular) does "good enough" static type checks, it throws warning at compile time (when we compile one function with a keystroke). We can also precise our function types gradually. It isn't a HM type system (Coalton[1] could be it) but it's already great (compared to no compile-time types at all).

Oh, about interactive development: that's sure, CL shines here. Objects get updated (lazily) after a class change, we can install Quicklisp libraries without restarting the image, etc. It's very smooth.

1: https://github.com/stylewarning/coalton