/**
* This method processes the key for use by the hash map.
*
* @access protected
* @param mixed $key the key to be processed
* @return string the key to be used
* @throws \Unicity\Throwable\InvalidArgument\Exception indicates an invalid key was specified
*/
protected function getKey($key)
{
$key = parent::getKey($key);
if (!$this->case_sensitive) {
$key = strtolower($key);
}
return $key;
}
