From f17747e04161477d30b4df0e11459eee237815c8 Mon Sep 17 00:00:00 2001
From: Justin <drakefjustin@gmail.com>
Date: Thu, 3 Nov 2011 22:30:36 +0000
Subject: [PATCH] This means that after unbinding every event, a trigger call
 will return faster, because !(calls = this._callbacks) will evaluate to true.

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

diff --git a/backbone.js b/backbone.js
index c5473ba5..2b915179 100644
--- a/backbone.js
+++ b/backbone.js
@@ -87,7 +87,7 @@
     unbind : function(ev, callback) {
       var calls, node, prev;
       if (!ev) {
-        this._callbacks = {};
+        this._callbacks = null;
       } else if (calls = this._callbacks) {
         if (!callback) {
           calls[ev] = {};