Description:
------------
__set() seems to leak memory when extending internal classes
(DOMElement for instance)

Reproduce code:
---------------
<?php
    class foo extends DOMElement {
        private $a = array();
        public function __construct() {
        }
        public function __set($k, $v) {
            $this->a[$k] = $v;
        }

    }
    $obj = new foo;
    $obj->foo = "bar";


Actual result:
--------------
[Tue Mar 28 21:45:10 2006]  Script:  'element.php'
/usr/src/php51/Zend/zend_object_handlers.c(292) :  Freeing 0x08320364 (5 bytes), script=element.php
/usr/src/php51/Zend/zend_hash.c(314) : Actual location (location was relayed)
[Tue Mar 28 21:45:10 2006]  Script:  'element.php'
/usr/src/php51/Zend/zend_hash.c(307) :  Freeing 0x08322B24 (39 bytes), script=element.php
[Tue Mar 28 21:45:10 2006]  Script:  'element.php'
/usr/src/php51/Zend/zend_object_handlers.c(284) :  Freeing 0x08322AA4 (32 bytes), script=element.php
/usr/src/php51/Zend/zend_hash.c(169) : Actual location (location was relayed)
[Tue Mar 28 21:45:10 2006]  Script:  'element.php'
/usr/src/php51/Zend/zend_object_handlers.c(283) :  Freeing 0x08322A24 (44 bytes), script=element.php
=== Total 4 memory leaks detected ===