[development] Should sess_read() call hook_user?

Should sess_read() call hook_user (via user_load)? This question came up due to a module developer's trouble maintaining user state across pages: http://drupal.org/node/49385 I traced through what was happening and came across sess_read() in session.inc which loads up the global $user with the most recent user for the session with some code that looks a lot like what's in user_load(), but it doesn't ever call hook_user -- is this by design? Thanks, Marc