Description:
------------
When I declare a property as "public", it's being ignored.
When I declare it as protected or private it is processed and visible from outside of the object.

Reproduce code:
---------------
A)
class Rules extends ArrayObject {
    public $len;
    function __construct($array){
        parent::__construct($array,2);
        $this['len'] = 2;
    }
}
$x = new Rules(array(1,2));
var_dump($x->len);

B)
class Rules extends ArrayObject {
    protected $len;
    function __construct($array){
        parent::__construct($array,2);
        $this['len'] = 2;
    }
}
$x = new Rules(array(1,2));
var_dump($x->len);

Expected result:
----------------
A) int(2)

B) Fatal error</b>:  Cannot access protected property Rules::$len

Actual result:
--------------
A) NULL

B) int(2)