…y that is located in /test/vendor.
…sed when the add/remove callbacks get triggered on a collection.
…tes so that the unset attributes aren't lost on subsequent calls of changedAttributes. Added test to verify this behavior.
…tes and appends them to the changedAttributes object.
…he old properties that already exist in now. To do that, previousAttributes had to be cloned. Changing "void 0" return to "undefined".
…lback method for the route name