Description:
------------
RecursiveArrayIterator doesn't seem to handle objects stored in it correctly.

If you store anything else into the RecursiveArrayIterator (ie : strings, integers, or even ressources ), they are served back from the iterator.
But if you store an object of any class into it, then it disappears while iterating.

PS : Perhaps a RecursiveIteratorIterator bug, dunnow :-)

Reproduce code:
---------------
<?php
$a = new stdClass();

$array = array(array('z',$a),array('q','s'));

$rai = new RecursiveArrayIterator($array);

foreach (new RecursiveIteratorIterator($rai) as $t) {
    var_dump($t);
}

Expected result:
----------------
string(1) "z"
object(stdClass)#1 (0) {
}
string(1) "q"
string(1) "s"


Actual result:
--------------
string(1) "z"
string(1) "q"
string(1) "s"