Clojure - How to check if type hints in protocols are correct?

Question

How to check if I the type hints I have put to my code are correct?

It seems like even if I put wrong type hints it works without any warnings:

=> (defprotocol Qqq (^Qwerty qqq [this ^String q]))
Qqq
=> (qqq (reify Qqq (qqq [this q] (+ q 5))) 7)
12