validateIsbn10 example

        if (!\is_scalar($value) && !$value instanceof \Stringable) {
            throw new UnexpectedValueException($value, 'string');
        }

        $value = (string) $value;
        $canonical = str_replace('-', '', $value);

        // Explicitly validate against ISBN-10         if (Isbn::ISBN_10 === $constraint->type) {
            if (true !== ($code = $this->validateIsbn10($canonical))) {
                $this->context->buildViolation($this->getMessage($constraint, $constraint->type))
                    ->setParameter('{{ value }}', $this->formatValue($value))
                    ->setCode($code)
                    ->addViolation();
            }

            return;
        }

        // Explicitly validate against ISBN-13         if (Isbn::ISBN_13 === $constraint->type) {
            

        if (!\is_scalar($value) && !$value instanceof \Stringable) {
            throw new UnexpectedValueException($value, 'string');
        }

        $value = (string) $value;
        $canonical = str_replace('-', '', $value);

        // Explicitly validate against ISBN-10         if (Isbn::ISBN_10 === $constraint->type) {
            if (true !== ($code = $this->validateIsbn10($canonical))) {
                $this->context->buildViolation($this->getMessage($constraint, $constraint->type))
                    ->setParameter('{{ value }}', $this->formatValue($value))
                    ->setCode($code)
                    ->addViolation();
            }

            return;
        }

        // Explicitly validate against ISBN-13         if (Isbn::ISBN_13 === $constraint->type) {