A bug in ClojureScript's range implementation?

range-bug.cljs

(defn range-print [rng]
  (let [fst (first rng)
        rst (rest rng)]
    (when fst
      (.log js/console "first: " (clj->js fst))
      (.log js/console "rest: " (clj->js rst))
      (range-print rst))))

(comment

  (range-print (range 10))

  ;; In my browser's console, the output of the above expression looks as follows.
  ;; NOTE the UNexpected "first" at the end.

  first:  0 
  rest:  [1, 2, 3, 4, 5, 6, 7, 8, 9] 
  first:  1 
  rest:  [2, 3, 4, 5, 6, 7, 8, 9] 
  first:  2 
  rest:  [3, 4, 5, 6, 7, 8, 9] 
  first:  3 
  rest:  [4, 5, 6, 7, 8, 9] 
  first:  4 
  rest:  [5, 6, 7, 8, 9] 
  first:  5 
  rest:  [6, 7, 8, 9] 
  first:  6 
  rest:  [7, 8, 9] 
  first:  7 
  rest:  [8, 9] 
  first:  8 
  rest:  [9] 
  first:  9 
  rest:  [] 
  first:  10 
  rest:  [] 

  ;; --------------------------------------------------------------------------

  (range-print (map identity (range 10)))

  ;; the above expression generates the output I expect.

  first:  0 
  rest:  [1, 2, 3, 4, 5, 6, 7, 8, 9] 
  first:  1 
  rest:  [2, 3, 4, 5, 6, 7, 8, 9] 
  first:  2 
  rest:  [3, 4, 5, 6, 7, 8, 9] 
  first:  3 
  rest:  [4, 5, 6, 7, 8, 9] 
  first:  4 
  rest:  [5, 6, 7, 8, 9] 
  first:  5 
  rest:  [6, 7, 8, 9] 
  first:  6 
  rest:  [7, 8, 9] 
  first:  7 
  rest:  [8, 9] 
  first:  8 
  rest:  [9] 
  first:  9 
  rest:  []

  )