(defn foo [^long l cb] (cb l))

(time
  (dotimes [n 1000000]
    (foo n (fn [l] nil))))

(time
  (dotimes [n 1000000]
    (foo n (fn [^long l] nil))))

"Elapsed time: 7.861 msecs"
"Elapsed time: 11.770973 msecs"


Why is the latter slower?

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