Quickforms is misusing old-style constructors - fatel error in our quickforms extension code in PHP 5.3

Looks like following fragment is not valid any more:

$className = get_class($this);
$this->$className($arg[0], $arg[1], $arg[2], $arg[3], $arg[4]);

This weird use of constructor relies on presence of old-style constructors which is fatal in 5.3