Description:
------------
Keys of returned array (in multiget) are type-casted to string. This behaviour has changed since 2.2.2 (version 2.2.1 still works fine).

I undestand this is a very special case (when using integers as keys and then relaying on the data type), but to clarify if this is supposed to be like that reporting this issue.

Reproduce code:
---------------
<?
$mc = new Memcache;
$mc->addServer('127.0.0.1',11212,0,1,2,1,1);

$ids = array(322,22);
$data = $mc->get($ids);
var_dump(array_keys($data));
?>


Expected result:
----------------
array(2) {
  [0]=>
  int(322)
  [1]=>
  int(22)
}

Actual result:
--------------
array(2) {
  [0]=>
  string(3) "322"
  [1]=>
  string(2) "22"
}