From 81f6a16c2908917ba33cdc014586cb2793cb3cb8 Mon Sep 17 00:00:00 2001
From: Casey Foster <c@sey.me>
Date: Thu, 14 Feb 2013 11:39:19 -0800
Subject: [PATCH] Fix #2269 - clone options before modifying

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

diff --git a/backbone.js b/backbone.js
index b0e5a297..2ccd6c7f 100644
--- a/backbone.js
+++ b/backbone.js
@@ -790,7 +790,7 @@
     // you can reset the entire set with a new list of models, without firing
     // any `add` or `remove` events. Fires `reset` when finished.
     reset: function(models, options) {
-      options || (options = {});
+      options = options ? _.clone(options) : {};
       if (options.parse) models = this.parse(models, options);
       for (var i = 0, l = this.models.length; i < l; i++) {
         this._removeReference(this.models[i]);