Clojureでtransientをmutableなオブジェクトとして扱ってはいけない ref: http://qiita.com/kurogelee/items/56694bbce1e374145e5a

file0.cljs

(let [v (transient {})]
  (dotimes [n 5] (assoc! v (keyword (str n)) n))
  (persistent! v))

file0.txt

(let [v (transient {})]
  (dotimes [n 5] (assoc! v (keyword (str n)) n))
  (persistent! v))

file1.txt

{:0 0, :1 1, :2 2, :3 3, :4 4}

file2.cljs

(let [v (transient {})]
  (dotimes [n 10] (assoc! v (keyword (str n)) n))
  (persistent! v))

file2.txt

(let [v (transient {})]
  (dotimes [n 10] (assoc! v (keyword (str n)) n))
  (persistent! v))

file3.txt

{:0 0, :1 1, :2 2, :3 3, :4 4, :5 5, :6 6, :7 7}