Description:
------------
When using overloading with the special function __set, and passing the value by reference, the overload is ignored, and a new attribute for the class object is created.

I'm not sure if this is a bug, but I couldn't find anything like it in the documentation, or in the bug list. Appreciate the help.
[]'s

Reproduce code:
---------------
class A {
	private $v;
	function __construct() {
		echo "constructing...\n";
	}
	function __set($key, $value) {
		echo "setting ".$key."\n";
		$this->v[$key] = $value;
	}
}

$foo = "bar";
$a = new A;
echo "without reference:\n";
$a->user = $foo;
echo "with reference:\n";
$a->user =& $foo;
var_dump($a);


Expected result:
----------------
constructing...
without reference:
setting user
with reference:
object(A)#1 (2) {
  ["v:private"]=>
  array(1) {
    ["user"]=>
    &string(3) "bar"
  }
}


Actual result:
--------------
constructing...
without reference:
setting user
with reference:
object(A)#1 (2) {
  ["v:private"]=>
  array(1) {
    ["user"]=>
    string(3) "bar"
  }
  ["user"]=>
  &string(3) "bar"
}