preDispatch vs. preDispatchType



     * Method designed to be overridden by child classes to add pre-dispatch
     * behaviors. This differs from {@link _preDispatch()} in that it is designed
     * for abstract controller type classes to override. Specific controllers
     * should override preDispatch instead.
     * @param string $action Action that is requested
    protected function _preDispatchType($action)

I don't understand this, where's now the difference between preDispatch and preDispatchType
Can anybody explain this, or give me a example?;)
_preDispatchType is overridden in abstract controllers like XenForo_ControllerPublic_Abstract (here among other things we check that the user is not banned as we need to check that in all public controllers) and XenForo_ControllerAdmin_Abstract. _preDispatch is overridden in specific controllers that extends abstract controllers, an example would be XenForo_ControllerAdmin_AddOn (it extends XenForo_ControllerAdmin_Abstract and here we check admin's specific permission to manage add-ons).
If you would look at the preDispatch method you will see that firstly executed abstract controller code and then specific controller code:
	final public function preDispatch($action)
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