Description:
------------
Attributes defined in classes deriving from ArrayObject do not show up in var_dump() and cannot be accessed via Reflection.

Note that this is fixed in 5.3 already.

Reproduce code:
---------------
class Bar extends ArrayObject
{
    protected $foo = 23;
    private $bar = 42;
}

var_dump( new Bar() );

Expected result:
----------------
object(Bar)#1 (0) {
  ["foo:protected"]=>
  int(23)
  ["bar:private"]=>
  int(42)
}

Actual result:
--------------
object(Bar)#1 (0) {
}