diff --git a/src/jolt/clojure/lang/persistent_hash_map.clj b/src/jolt/clojure/lang/persistent_hash_map.clj
deleted file mode 100644
index 028a519..0000000
--- a/src/jolt/clojure/lang/persistent_hash_map.clj
+++ /dev/null
@@ -1,81 +0,0 @@
-(ns jolt.lang.persistent-hash-map
-  "PersistentHashMap using simple array-based implementation.")
-
-(deftype PersistentHashMap [count root has-nil? nil-value _meta])
-
-(def EMPTY (PersistentHashMap. 0 nil false nil nil))
-
-(defn- mask [hash shift]
-  (mod (abs (int hash)) 32))
-
-(defn- find-key-index [arr key]
-  (let [len (alength arr)]
-    (loop [i 0]
-      (if (< i len)
-        (if (identical? (aget arr i) key)
-          i
-          (recur (+ i 2)))
-        -1))))
-
-(defn- node-assoc [arr h key val added?]
-  (let [idx (find-key-index arr key)]
-    (if (= idx -1)
-      ;; Insert — create new array with +2 slots
-      (let [old-len (alength arr)
-            new-arr (object-array (+ old-len 2))]
-        (loop [i 0]
-          (if (< i old-len)
-            (do (aset new-arr i (aget arr i))
-                (recur (inc i)))))
-        (aset new-arr old-len key)
-        (aset new-arr (inc old-len) val)
-        (aset added? 0 true)
-        new-arr)
-      ;; Replace — clone and update
-      (let [new-arr (aclone arr)]
-        (aset new-arr (inc idx) val)
-        new-arr))))
-
-(defn- node-find [arr key]
-  (let [idx (find-key-index arr key)]
-    (if (= idx -1)
-      nil
-      (aget arr (inc idx)))))
-
-(defn phm-assoc [m key val]
-  (if (nil? key)
-    (PersistentHashMap.
-      (if (.-has-nil? m) (.-count m) (inc (.-count m)))
-      (.-root m) true val (.-_meta m))
-    (let [added? (object-array 1)
-          root (.-root m)
-          new-arr (node-assoc (if (nil? root) (object-array 0) root)
-                              (hash key) key val added?)]
-      (PersistentHashMap.
-        (if (aget added? 0) (inc (.-count m)) (.-count m))
-        new-arr (.-has-nil? m) (.-nil-value m) (.-_meta m)))))
-
-(defn phm-get
-  ([m key] (phm-get m key nil))
-  ([m key not-found]
-   (if (nil? key)
-     (if (.-has-nil? m) (.-nil-value m) not-found)
-     (let [root (.-root m)]
-       (if (nil? root)
-         not-found
-         (let [result (node-find root key)]
-           (if (nil? result) not-found result)))))))
-
-(defn phm-contains? [m key]
-  (not (nil? (phm-get m key ::sentinel))))
-
-(defn phm-count [m] (.-count m))
-
-(defn hash-map [& kvs]
-  (if (nil? kvs)
-    EMPTY
-    (loop [m EMPTY pairs (seq kvs)]
-      (if (and pairs (seq (rest pairs)))
-        (recur (phm-assoc m (first pairs) (first (rest pairs)))
-               (rest (rest pairs)))
-        m))))