BooleanField::__construct

function __construct($name, $parameters = array())
{
	parent::__construct($name, $parameters);

	if (empty($parameters['values']))
	{
		$this->values = array(false, true);
	}
	else
	{
		$this->values = $parameters['values'];
	}

	$this->addSaveDataModifier(array($this, 'normalizeValue'));
}