CakePHP, admin routing, and the Auth loginAction

UPDATE 20100817: rather than using the [php]'admin' => false[/php] part below, check out [php]$this->params['prefix'] = false[/php]. This seems to work for the prefix routing in the 1.3.x series, which has taken the place of admin routing in the older pre-1.3 versions of Cake.

This confused me for a while because I couldn't find appropriate documentation after much searching.  Many CakePHP Auth/Acl tutorials show setting a loginAction like this in a controller's beforeFilter:

$this->Auth->loginAction = array('controller' => 'users', 'action' => 'login');

That's great and it redirects to the correct path /users/login... unless you happen to have admin routing set up.  If so, then it rather points you to /admin/users/login which probably isn't intended or desired.  I couldn't and stil can't find sufficient documentation to explain how to set that variable, but one blurb in the CakePHP book shows an additional array key-value pair of admin=>false.  So I tried it like this:

$this->Auth->loginAction = array('admin' => false, 'controller' => 'users', 'action' => 'login');

Behold!  It actually worked.  Since I can't find the docs, I'll assume that the controller (app_controller in my case) reads the admin key/value and interprets it to mean, "If you're accessing admin routed pages, turn off admin routing before rendering this path."  Unfortunately, that's only a guess.  Some additional testing could help to identify how it works, but I'm just concerned with changing the path for plain old admin routing right now.