/**
* Serializes type
* @param mixed $rec
* @return mixed
*/
public function serializeToString($rec = -1)
{
// now convert signed int to int
$save = $this->value;
if ($this->value < 0) {
$this->value = abs($this->value) * 2 - 1;
} else {
$this->value *= 2;
}
$string = parent::serializeToString($rec);
// restore value
$this->value = $save;
return $string;
}
