allow the passing of any number of arguments to Model#initialize

backbone.js

@@ -158,7 +158,7 @@
     this.set(attributes, {silent : true});
     this._changed = false;
     this._previousAttributes = _.clone(this.attributes);
-    this.initialize(attributes, options);
+    this.initialize.apply(this, arguments);
   };
 
   // Attach all inheritable methods to the Model prototype.

test/model.js

@@ -424,7 +424,7 @@ $(document).ready(function() {
     var Defaulted = Backbone.Model.extend({
       defaults: {one: 1},
       initialize : function(attrs, opts) {
-        equals(attrs.one, 1);
+        equals(this.attributes.one, 1);
       }
     });
     var providedattrs = new Defaulted({});