@Override
  public void toData(DataOutput out) throws IOException {
    InternalDataSerializer.writeUnsignedVL(previousVersion, out);
    writeReceived(out);
  }
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