protected function isRequiredUnless($value, $parameters)
    {
        $this->requireParameterCount(2, $parameters, 'required_unless');

        $data = Arr::get($this->data, $parameters[0]);

        $values = array_slice($parameters, 1);

        if (!in_array($data, $values)) {
            return $this->isRequired($value);
        }

        return true;
    }