public static function convertContributors($value, $prevValue)
    {
        $mergeValue = \is_array($prevValue) ? $prevValue : array();
        $mergeValue = array_merge($mergeValue, \is_array($value) ? $value : array());

        if (\count($mergeValue) > 0) {
            $value = $mergeValue;
        }

        return $value;
    }