Description:
------------
I'm not sure if this is a bug or not. If not then it is definitely a change request.

When creating a RecursiveIterator that also implements Countable, and using count() with COUNT_RECURSIVE, count will not count recursively.

Reproduce code:
---------------
class MyIterator implements RecursiveIterator, Countable
{
	protected $toIterate = NULL;

	# Other Iterator functions......

	public function hasChildren()
	{
		return ( count( $this->getChildren() ) > 0 );
	}
	
	public function getChildren()
	{
		return new MyIterator( $this->toIterate[ $this->key() ]->cache );
	}

	public function count()
	{
		return count( $this->toIterate );
	}
}

$multiObject = array();
$multiObject[0] = new stdClass();
$multiObject[0]->cache = array( 1,2,3,4,5 );
$multiObject[1] = new stdClass();
$multiObject[1]->cache = array( 6,7,8,9,10 );
$multiObject[2] = new stdClass();
$multiObject[2]->cache = array( 11,12,13,14,15 );

print count( new MyIterator( $multiObject ), COUNT_RECURSIVE );


Expected result:
----------------
printed total of "18"

Actual result:
--------------
printed total of "3"