@Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("preparedBlockHash", preparedBlockHash)
        .add("preparedRound", preparedRound)
        .toString();
  }
Adds this rounds information to a given RLP buffer

@param out The RLP buffer to add to
consensus/qbft-core/src/main/java/org/hyperledger/besu/consensus/qbft/core/payload/PreparedRoundMetadata.java