Clojure: infoke overloading

gistfile1.clj

(defrecord Foo [fn-impl]
  clojure.lang.IFn
  (invoke [this] (fn-impl))
  (invoke [this a] (fn-impl a))
  (invoke [this a b] (fn-impl a b))
  (invoke [this a b c] (fn-impl a b c))
  (invoke [this a b c d] (fn-impl a b c d))
  (invoke [this a b c d e] (fn-imple a b c d e))
  (invoke [this a b c d e f (fn-impl a b c d e f)])
  (invoke [this a b c d e f g (fn-impl a b c d e f g)])
  (invoke [this a b c d e f g h (fn-impl a b c d e f g h)])
  (invoke [this a b c d e f g h i (fn-impl a b c d e f g h i)])
  ;;clearly needs a macro to continue...
  
  (applyTo [this arg-list] (clojure.lang.AFn/applyToHelper fn-impl arg-list)))