Description:
------------
xDebug 0000996: Can't evaluate property of class that extends ArrayObject

http://bugs.xdebug.org/view.php?id=996

http://youtrack.jetbrains.com/issue/WI-15975

Test script:
---------------
<?php

class Clazz extends ArrayObject{

}

$a = new Clazz();
$a->b = array(1,2,3);

echo $a->b; //set breakpoint here

?>

Can't get $a->b via 'context_get' ("can not get property"), but the same property is successfully received via 'eval'.