Description:
------------
After using RecursiveIteratorIterator::getInnerIterator method in a loop, there is a missing RecursiveArrayIterator object in the result. 	

For comparison, RecursiveIteratorIterator::getSubIterator method returns the expected result also.

Test script:
---------------
$array = array (
    'question' => 'text',
    'items'    => array (
            '0' => array ( 'phrase' => 'text text', ),
            '1' => array ( 'phrase' => 'text text text', ),
    ),
);

$array_object = new ArrayObject( $array, 0, "RecursiveArrayIterator"  );
$iterator     = new RecursiveIteratorIterator( $array_object->getIterator() );

foreach( $iterator as $key => $value ) {
    print_r( $iterator->getInnerIterator() ); // missing RecursiveArrayIterator Object of "items"
}

while( $iterator->valid() ) {
    print_r( $iterator->getInnerIterator() ); // missing RecursiveArrayIterator Object of "items"
    $iterator->next();
}

foreach( $iterator as $key => $value ) {
    for( $i = 0; $i <= $iterator->getDepth(); $i++ ) {
        print_r( $iterator->getSubIterator($i) ); // correct
    }
}

Expected result:
----------------
The getInnerIterator method should return this object too:
[11-Mar-2013 10:37:04 UTC] RecursiveArrayIterator Object
(
    [storage:ArrayIterator:private] => Array
        (
            [0] => Array
                (
                    [phrase] => text text
                )
            [1] => Array
                (
                    [phrase] => text text text
                )
        )
)

Actual result:
--------------
Missing the Expected result.