Use matches in .where

backbone.js

@@ -833,12 +833,9 @@
     // Return models with matching attributes. Useful for simple cases of
     // `filter`.
     where: function(attrs, first) {
-      if (_.isEmpty(attrs)) return first ? void 0 : [];
+      var matches = _.matches(attrs);
       return this[first ? 'find' : 'filter'](function(model) {
-        for (var key in attrs) {
-          if (attrs[key] !== model.get(key)) return false;
-        }
-        return true;
+        return matches(model.attributes);
       });
     },