public function getAsStringArray(string $type): ?array
    {
        $plurals = $this->entry[$type];
        $plurals = is_array($plurals) ? $plurals : array('', '');
        $ret = array();
        foreach ($plurals as $i => $value) {
            if (is_array($value)) {
                $value = implode('', $value);
            }
            $ret[$i] = $value;
        }
        return $ret;
    }