VariationFactory.php
public function validateValue(string $type, $value)
    {
        if (!isset($this->map[$type])) {
            throw new \InvalidArgumentException(sprintf('Variation type %s is not valid', $type));
        }
        $class = $this->map[$type];

        if (false === $class::validateValue($value)) {
            $stringType = in_array(gettype($value), ['string', 'float'], true) ? $value : gettype($value);

            throw new \InvalidArgumentException(sprintf('"%s" is not a valid value for type "%s"', $stringType, $type));
        }
    }
public function validateValue(string $type, $value)
    {
        if (!isset($this->map[$type])) {
            throw new \InvalidArgumentException(sprintf('Variation type %s is not valid', $type));
        }
        $class = $this->map[$type];

        if (false === $class::validateValue($value)) {
            $stringType = in_array(gettype($value), ['string', 'float'], true) ? $value : gettype($value);

            throw new \InvalidArgumentException(sprintf('"%s" is not a valid value for type "%s"', $stringType, $type));
        }
    }
@param string $type
@param $value

@throws \InvalidArgumentException