public function __construct(ChecksumCalculatorInterface $checksumCalculator = null)
{
parent::__construct($checksumCalculator ?: new Isbn10ChecksumCalculator());
}
/**
* @param ConverterInterface[][] $converterMap
*/
public function __construct(array $converterMap = null)
{
parent::__construct();
$this->converterMap = $converterMap ?: [Ean8::class => [new Ean13Converter()], Ean13::class => [new Ean8Converter(), new Isbn10Converter()], Isbn10::class => [new Ean13Converter()]];
}