Description:
------------
When passing an array to BitSet::fromArray, the original array is modified when 
any of the values in the array are non-long.

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

$arr = array(5, 6, '7');
var_dump($arr);
BitSet::fromArray($arr);
var_dump($arr);

?>

Expected result:
----------------
array(3) {
  [0]=>
  int(5)
  [1]=>
  int(6)
  [2]=>
  string(1) "7"
}

Actual result:
--------------
array(3) {
  [0]=>
  int(5)
  [1]=>
  int(6)
  [2]=>
  int(7)
}