Magento Block construct - use _construct or __construct? -

i little bit confused. read alan storm's excellent article magento block lifecycle methods , far understand 1 should using protected _construct() method initialize block. in case want set right block template. assume should using

protected function _construct() {     parent::_construct();     $this->settemplate('stenik/qaforum/forum.phtml'); } 

however, when @ blocks of of core magento modules, seem use php __construct method it. example mage_poll_block_poll, mage_productalert_block_price, mage_rating_block_entity_detailed, mage_review_block_form

although both ways work, i'd know right way it.

it's academic, right way it® override magento constructor i.e. _construct requested core team in mage_core_block_abstract:

/**  * internal constructor, called real constructor  *  * please override 1 instead of overriding real __construct constructor  *  */ protected function _construct() {     /**      * please override 1 instead of overriding real __construct constructor      */ }