From ff544ae997b9f600f43c39c932f45fad533667cd Mon Sep 17 00:00:00 2001
From: Michael Ficarra <github@michael.ficarra.me>
Date: Mon, 6 Feb 2012 12:24:13 -0500
Subject: [PATCH] `_.difference` should perform a shallow flatten

---
 underscore.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/underscore.js b/underscore.js
index c75bf4f75..a9d179d50 100644
--- a/underscore.js
+++ b/underscore.js
@@ -403,7 +403,7 @@
   // Take the difference between one array and a number of other arrays.
   // Only the elements present in just the first array will remain.
   _.difference = function(array) {
-    var rest = _.flatten(slice.call(arguments, 1));
+    var rest = _.flatten(slice.call(arguments, 1), true);
     return _.filter(array, function(value){ return !_.include(rest, value); });
   };