src/IntType.php
protected function check($value)
    {
        if (is_int($value)) {
            return $value;
        }

        if ($value === false || $value === 0.0 || $value === '0') {
            return 0;
        }

        if ($value === true || $value === 1.0 || $value === '1') {
            return 1;
        }

        if ($value instanceof IntType) {
            return $value->value();
        }

        if ($value instanceof Type) {
            $value = $value->value();
        } else {
            if (is_array($value)) {
                throw new InvalidArgumentException('Invalid int, array given');
            }

            if (is_resource($value)) {
                throw new InvalidArgumentException('Invalid int, resource given');
            }

            if (is_object($value)) {
                throw new InvalidArgumentException('Invalid int, object given');
            }
        }

        try {
            $value = parent::check($value);
        } catch (InvalidArgumentException $e) {
            throw new InvalidArgumentException('Invalid int: ' . $value);
        }

        if (filter_var($value, FILTER_VALIDATE_INT) === false) {
            throw new InvalidArgumentException('Invalid int: ' . $value);
        }

        return (int) $value;
    }
protected function check($value)
    {
        if (is_int($value)) {
            return $value;
        }

        if ($value === false || $value === 0.0 || $value === '0') {
            return 0;
        }

        if ($value === true || $value === 1.0 || $value === '1') {
            return 1;
        }

        if ($value instanceof IntType) {
            return $value->value();
        }

        if ($value instanceof Type) {
            $value = $value->value();
        } else {
            if (is_array($value)) {
                throw new InvalidArgumentException('Invalid int, array given');
            }

            if (is_resource($value)) {
                throw new InvalidArgumentException('Invalid int, resource given');
            }

            if (is_object($value)) {
                throw new InvalidArgumentException('Invalid int, object given');
            }
        }

        try {
            $value = parent::check($value);
        } catch (InvalidArgumentException $e) {
            throw new InvalidArgumentException('Invalid int: ' . $value);
        }

        if (filter_var($value, FILTER_VALIDATE_INT) === false) {
            throw new InvalidArgumentException('Invalid int: ' . $value);
        }

        return (int) $value;
    }
Check the value

@param  mixed $value
@return int