Description:
------------
It becomes impossible to compare objects as soon as they have cross references.
if an object A reference an object B that reference A it becomes impossible to compare objects with == or === operators.
I understood your "reference" system and actualy I know that's not really a bug but an issue, but at least the === operator must deal with "already seen" objects.
I just wonder if PHP5 will become a near to real object language or if that behavior will persist.
Follow a basic example of Parent/Child object structure that can't be implemented in PHP4.
I think that if it's impossible to work properly with instances, PHP5 will not ritch the rank of an OOP language despite all that is said about it.
Best regards

-Marc

Reproduce code:
---------------
<?PHP
Class ParentObject {
	
	var $name;
	var $chidren;
	
	Function &ParentObject($name){
		$this->name=$name;
		$this->children=array();
	}
	
	Function addChild(&$child){
		if(!isset($this->children[$child->name])){
			$this->children[$child->name]=&$child;
			$child->setParent($this);
		}
	}
}
Class ChildObject {
	
	var $name;
	var $parent;
	
	Function &ChildObject($name){
		$this->name=$name;
		$this->parent=null;
	}
	
	Function setParent(&$parent){
		if($this->parent!==$parent){
			if($this->parent!=null){
				$this->parent->removeChild($this);
			}
			$this->parent=&$parent;
			if($parent!=null){
				$parent->addChild($this);
			}
		}
	}
}
$p=&new ParentObject("parent");
$c=&new ChildObject("child");
$c->setParent($p);
?>

Expected result:
----------------
something other than 
<b>Fatal error</b>:  Nesting level too deep - recursive dependency? in <b>C:\Program Files\Apache Group\Apache2\htdocs\ngn2\test.php</b> on line <b>29</b><br />


Actual result:
--------------
<b>Fatal error</b>:  Nesting level too deep - recursive dependency? in <b>C:\Program Files\Apache Group\Apache2\htdocs\ngn2\test.php</b> on line <b>29</b><br />