@Override
  public RVVExceptionB clone() {
    RVVExceptionB clone = new RVVExceptionB(previousVersion, nextVersion);
    if (received != null) {
      clone.received = (BitSet) received.clone();
      clone.receivedBaseVersion = receivedBaseVersion;
    }
    return clone;
  }
checks to see if any of the received versions can be merged into the start/end version numbers
geode-core/src/main/java/org/apache/geode/internal/cache/versions/RVVExceptionB.java