Description:
------------
This code sample works fine

<?php

$input = new \ArrayObject;
$input['whatever'] = 'foo';

$array = new \ArrayObject($input);
var_dump($array['whatever']);
// will it return foo? right!

so I expected that it should work same way for objects implemented ArrayAccess 
interface. But it is not true.

Test script:
---------------
https://gist.github.com/makasim/5123486

Expected result:
----------------
either YourCustomArrayObject::offsetExists or YourCustomArrayObject::offsetGet is 
called

It should output 1 or 2 and exit the script

Actual result:
--------------
PHP Notice:  Undefined index:  whatever in /home/maksim/test.php on line 57