Description:
------------
nApplyCount release missing

Test script:
---------------
<?php
$lua = new Lua();
$lua->eval("
function main(x)
 return nil
end");
$obj = array(1, 2, 3, array(4, 5, 6));
echo json_encode($obj) . "\n";
$lua->call('main', array($obj));
echo json_encode($obj) . "\n";

Expected result:
----------------
[1,2,3,[4,5,6]]
[1,2,3,[4,5,6]]

Actual result:
--------------
[1,2,3,[4,5,6]]
PHP Warning:  json_encode(): recursion detected in /tmp/test.php on line 10
[1,2,3,null]