private function addMsgidPluralToOutput(array $entry, string $output): array
    {
        if (isset($entry['msgid_plural'])) {
            // Special clean for msgid_plural
            if (\is_string($entry['msgid_plural'])) {
                $msgidPlural = \explode($this->eol, $entry['msgid_plural']);
            } elseif (\is_array($entry['msgid_plural']) && \count($entry['msgid_plural']) !== 0) {
                $msgidPlural = $entry['msgid_plural'];
            } else {
                throw new DumpException('msgid_plural not string or array.');
            }

            $output .= 'msgid_plural ';

            foreach ((array) $msgidPlural as $plural) {
                $output .= $this->cleanExport($plural) . $this->eol;
            }
        }

        return [$entry, $output];
    }