Clojure has a gradual type system--core.typed--that I've used extensively. It's... it's very cool, but for my uses it seems to be more trouble than it's worth.

Clojure has a gradual type system--core.typed--that I've used extensively. It's... it's very cool, but for my uses it seems to be more trouble than it's worth. I keep coming back to it every few years, though.