gistfile1.clj

(defn PathFollower-Update [^UnityEngine.Component self]
  (let [t (long (Time/get_time))
        tf (float (Time/get_time))
        ^objects ary (.state self)
        ^object current-pos (aget ary t)
        ^object next-pos (aget ary (+ 1 t))
        ;; generates fast code because it knows the type of self and trt
        ^System.Type trt UnityEngine.Transform
        ^UnityEngine.Transform transform (.GetComponent self trt)] ;

    (.set_localPosition transform
      (Vector3/Lerp
        current-pos
        next-pos
        (- tf t)))))

gistfile2.clj

(defn PathFollower-Update [^UnityEngine.Component self]
  (let [t (long (Time/get_time))
        tf (float (Time/get_time))
        ^objects ary (.state self)
        ^object current-pos (aget ary t)
        ^object next-pos (aget ary (+ 1 t))
        ;; generates SLOW reflection code because it DOES NOT know the type of the 2nd parameter, despite the hint
        ^UnityEngine.Transform transform (.GetComponent self ^System.Type UnityEngine.Transform)] 

    (.set_localPosition transform
      (Vector3/Lerp
        current-pos
        next-pos
        (- tf t)))))