From cb37b845e433facb1eab00341ce031bed5f04e97 Mon Sep 17 00:00:00 2001
From: Andy Fingerhut <andy_fingerhut@alum.wustl.edu>
Date: Mon, 15 Oct 2012 12:50:07 -0700
Subject: [PATCH] CLJ-1087: Enhance performance of diff on maps with many
 common keys

---
 src/clj/clojure/data.clj |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/clj/clojure/data.clj b/src/clj/clojure/data.clj
index 345b234..2d2d6e0 100644
--- a/src/clj/clojure/data.clj
+++ b/src/clj/clojure/data.clj
@@ -115,7 +115,7 @@
   
   java.util.Map
   (diff-similar [a b]
-    (diff-associative a b (set/union (keys a) (keys b)))))
+    (diff-associative a b (into (set (keys a)) (keys b)))))
 
 (defn diff
   "Recursively compares a and b, returning a tuple of
-- 
1.7.10