Description:
------------
Whenever you use the $append[] method, offsetGet in object implementing ArrayAccess.

Reproduce code:
---------------
<?php
class MyArrayObject extends ArrayObject
{
	function offsetSet( $k, $v )
	{
		//Will Print OffsetSet: \n NULL \n NULL - 
		var_dump( 'offsetSet:', $k, $value );
	}

}

$test = new MyArrayObject();
$test[] = 'test';
?>

Expected result:
----------------
Arguments in offsetGet should return the new offset key and the value properly.

Actual result:
--------------
$k and $v in the example above var_dump to NULL