BSONObj Message::obj() const {
    // MsgData::ConstView qr = singleData().view2ptr();
    // auto bsonObj = BSONObj(qr.data());
    // bsonObj.shareOwnershipWith(this->sharedBuffer());
    // bsonObj.makeOwned();    BSONObj bsonObj;    const uint32_t flags = OpMsg::flags(*this);
    auto dataSize = this->dataSize() - sizeof(flags);
    BufReader sectionsBuf(singleData().data() + sizeof(flags), dataSize);    while (!sectionsBuf.atEof()) {
        const auto sectionKind = sectionsBuf.read<uint8_t>();
        switch (sectionKind) {
            case 0: {  // body
                bsonObj = sectionsBuf.read<Validated<BSONObj>>();
                break;
            }            case 1: {  // Section::kDocSequence:
                // The first 4 bytes are the total size, including themselves.
                const auto remainingSize =
                    sectionsBuf.read<LittleEndian<int32_t>>() - sizeof(int32_t);
                BufReader seqBuf(sectionsBuf.skip(remainingSize), remainingSize);
                seqBuf.readCStr();
                while (!seqBuf.atEof()) {
                    seqBuf.read<Validated<BSONObj>>();
                }
                break;
            }            case 2: {  // Section::kSecurityToken
                // if op_msg is parsed by mongoBridge, bridge has a backup check since multitenancy
                // should be false
                sectionsBuf.readCStr();
                break;
            }            default:
                // Using uint32_t so we append as a decimal number rather than as a char.
                uasserted(40432, str::stream() << "Unknown section kind " << uint32_t(sectionKind));
        }
    }    return bsonObj;
}