Description:
------------
The following code works fine on 5.0.2, but causes the fatal error on 5.0.4. Using for($i; $i<$d->documentElement->childNodes->length; $i++){} loop works fine, bt the foreach version is now broken.

Reproduce code:
---------------
$d = new DOMDocument();
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<root>
	<child></child>
	<child></child>
	<child></child>
	<child></child>
</root>
XML;
$d->loadXML($xml);
foreach($d->documentElement->childNodes AS $child){
	print($child->nodeName."\n");
}

Expected result:
----------------
#text child #text child #text child #text child #text child #text  

Actual result:
--------------
Fatal error: Cannot access undefined property for object with overloaded property access in /home/tom/test/bug_reports/overloaded.php on line 15