From 99564138e8c745f71f5842871c0a6ce30b26bde7 Mon Sep 17 00:00:00 2001
From: Jeremy Ashkenas <jashkenas@gmail.com>
Date: Wed, 9 Dec 2009 11:17:30 -0500
Subject: [PATCH] added an extra check in isEqual to test for falsy against
 truthy values (so as to short circuit before trying to look for properties on
 null)

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

diff --git a/underscore.js b/underscore.js
index 51398635d..da098bc97 100644
--- a/underscore.js
+++ b/underscore.js
@@ -424,6 +424,8 @@
     if (atype != btype) return false;
     // Basic equality test (watch out for coercions).
     if (a == b) return true;
+    // One is falsy and the other truthy.
+    if ((!a && b) || (a && !b)) return false;
     // One of them implements an isEqual()?
     if (a.isEqual) return a.isEqual(b);
     // Check dates' integer values.