A bug in fine-grained locals clearing in Clojure 1.5?

locals_clearing.clj

(deftype FinalizeReporter [x]
  Object
  (finalize [this] (println "Finalizing" x))
  clojure.lang.IDeref
  (deref [this] x))

(defn leaker [n]
  (with-open [_ (reify java.io.Closeable (close [this]))]
    (let [s (map #(FinalizeReporter. %) (take 10 (iterate inc 0)))]
      (when (> n -1)
        (try
          (->> s
               (map #(do (Thread/sleep 100) (System/gc) (println @%)))
               dorun))))))

ser=> *clojure-version*
{:major 1, :minor 5, :incremental 0, :qualifier nil}
user=> (leaker 10)
0
1
2
3
4
5
6
7
8
9
nil
user=> (System/gc)
Finalizing 9
Finalizing 8
Finalizing 7
Finalizing 6
Finalizing 5
Finalizing 4
Finalizing 3
Finalizing 2
Finalizing 1
Finalizing 0

user=> *clojure-version*
{:major 1, :minor 4, :incremental 0, :qualifier nil}
user=> (leaker 10)
0
Finalizing 0
1
Finalizing 1
2
Finalizing 2
3
Finalizing 3
4
Finalizing 4
5
Finalizing 5
6
Finalizing 6
7
Finalizing 7
8
Finalizing 8
9
nil