@Ocramius The original intent was that this would be more of an alternative to using sessions, using cache, so ```session_id()``` would potentially just return the empty string at this point. The reason I chose "storage" was just to mimic the ```MEMBER_DEFAULT``` constant in https://github.com/zendframework/zf2/blob/master/library/Zend/Authentication/Storage/Session.php#L25 since the ```KEY_DEFAULT``` constant achieves a similar purpose.