__destruct() behaviour

While http://www.php.net/zend-engine-2.php claims the following 'Like constructors, parent destructors will not be called implicitly by the engine. In order to run a parent destructor, one would have to explicitly call parent::__destruct() in the destructor body. the following code php -r 'abstract class A { protected function __destruct() {} } class B extends A {} $b = new B;' results in Warning: Call to protected B::__destruct() from context '' during shutdown ignored in Unknown on line 0 which is inconsistent with the quoted description. It also introduces an asymmetry compared to constructors which I think is confusing. Any thoughts ? -- Ard