private function serializePersonalDataValue(SerializablePersonalDataValue $value): array {
        $dataKey    = PersonalDataKey::generate();
        $dataString = json_encode($value->serialize());

        $this->dataStore->storeData($value->personalKey(), $dataKey, PersonalData::fromString($dataString));

        return [
            'personalKey' => $value->personalKey()->serialize(),
            'dataKey'     => $dataKey->serialize(),
        ];
    }