Description:
------------
$_SESSION looses its ability to set session variables when I do
$anythinghere = $_SESSION; This only happens when register_long_arrays =
Off

Reproduce code:
---------------
<?
// Bug with Sessions ?
// PHP Version 5.1.5
// Operating System: Fedora Core 5
// Only happens when register_long_arrays = Off
session_start();

echo "session_id: ".session_id()."<br />";
if(!array_key_exists('counter',$_SESSION)) { $_SESSION['counter'] = 0;
}
$anythinghere = $_SESSION;
echo $_SESSION['counter'];

// Play with commenting out these 2 lines and refreshing your page.
// $anythinghere['counter']++;
$_SESSION['counter']++;
?>

Expected result:
----------------
I expect that the session counter to increment on a page reload, but it
does not. 

Actual result:
--------------
The session counter does not increment.

Also does not work with register_long_arrays

<?php
session_start();
echo session_id()."<br />";
if(!isset($_SESSION['foo']))
        $_SESSION['foo'] = 0;
$foo = $_SESSION; //works perfectly when this statement is commented
$_SESSION['foo']++;
echo $_SESSION['foo'];
?>

$_SESSION looses it's "magical" behaviour when assigned to any
variable.