diff --git a/vendor/underscore/test/objects.js b/vendor/underscore/test/objects.js
index 1d708d98f..4e77d3272 100644
--- a/vendor/underscore/test/objects.js
+++ b/vendor/underscore/test/objects.js
@@ -228,14 +228,6 @@ $(document).ready(function() {
     ok(_.isEqual(Array(3), Array(3)), "Sparse arrays of identical lengths are equal");
     ok(!_.isEqual(Array(3), Array(6)), "Sparse arrays of different lengths are not equal when both are empty");
 
-    // According to the Microsoft deviations spec, section 2.1.26, JScript 5.x treats `undefined`
-    // elements in arrays as elisions. Thus, sparse arrays and dense arrays containing `undefined`
-    // values are equivalent.
-    if (0 in [undefined]) {
-      ok(!_.isEqual(Array(3), [undefined, undefined, undefined]), "Sparse and dense arrays are not equal");
-      ok(!_.isEqual([undefined, undefined, undefined], Array(3)), "Commutative equality is implemented for sparse and dense arrays");
-    }
-
     // Simple objects.
     ok(_.isEqual({a: "Curly", b: 1, c: true}, {a: "Curly", b: 1, c: true}), "Objects containing identical primitives are equal");
     ok(_.isEqual({a: /Curly/g, b: new Date(2009, 11, 13)}, {a: /Curly/g, b: new Date(2009, 11, 13)}), "Objects containing equivalent members are equal");
diff --git a/vendor/underscore/underscore-min.js b/vendor/underscore/underscore-min.js
index 4c886ad38..f8e530267 100644
--- a/vendor/underscore/underscore-min.js
+++ b/vendor/underscore/underscore-min.js
@@ -5,29 +5,29 @@
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diff --git a/vendor/underscore/underscore.js b/vendor/underscore/underscore.js
index cffdeb873..ecffbf946 100644
--- a/vendor/underscore/underscore.js
+++ b/vendor/underscore/underscore.js
@@ -416,13 +416,13 @@
   _.uniq = _.unique = function(array, isSorted, iterator) {
     var initial = iterator ? _.map(array, iterator) : array;
     var results = [];
-    _.reduce(initial, function(memo, value, index) {
-      if (isSorted ? (_.last(memo) !== value || !memo.length) : !_.include(memo, value)) {
-        memo.push(value);
+    var seen = [];
+    each(initial, function(value, index) {
+      if (isSorted ? (!index || seen[seen.length - 1] !== value) : !_.include(seen, value)) {
+        seen.push(value);
         results.push(array[index]);
       }
-      return memo;
-    }, []);
+    });
     return results;
   };
 
@@ -830,8 +830,7 @@
       if (result) {
         // Deep compare the contents, ignoring non-numeric properties.
         while (size--) {
-          // Ensure commutative equality for sparse arrays.
-          if (!(result = size in a == size in b && eq(a[size], b[size], aStack, bStack))) break;
+          if (!(result = eq(a[size], b[size], aStack, bStack))) break;
         }
       }
     } else {