PHP Exercise - Resistor Color Trio, missing params signature?

Programming PHP
1

Isn’t that a mistake that the label function is missing params and signature.

public function label(): string
    {
        throw new \BadMethodCallException(sprintf('Implement the %s method', __FUNCTION__));
    }

For me it should be

public function label(array $colors): string
    {
        throw new \BadMethodCallException(sprintf('Implement the %s method', __FUNCTION__));
    }

There are no tests cases conflicting with that change, and it’s in my eyes more correct, as a param will always be need for the calculation.