private boolean isAnEarlierRound(
      final ConsensusRoundIdentifier left, final ConsensusRoundIdentifier right) {
    return left.getRoundNumber() < right.getRoundNumber();
  }
Clears old rounds from storage that have been superseded by a given round

@param completedRoundIdentifier round identifier that has been identified as superseded
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/statemachine/RoundChangeManager.java