View caching for the homepage in the PagesController doesn't seem to work

I've set up view caching successfully for other controller/actions in my Cake application.  But PagesController does not seem to cache anything at all.

At the top of PagesController.php I have:

var $cacheAction = array (

  'display/index/' => array('callbacks' => false, 'duration' => '+1 week'),

'index' => array('callbacks' => false, 'duration' => '+1 week'),

'/' => array('callbacks' => false, 'duration' => '+1 week'),

 

);

But still, when I visit the homepage either through '/' or '/pages/index/' -- nothing caches.

Does the PagesController follow different rules than other controllers when it comes to view caching?  I am at a loss...

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