@Override
  public boolean contains(long version) {
    if (version <= previousVersion) {
      return false;
    }
    return (received != null && received.get((int) (version - receivedBaseVersion)));
  }
has the given version been recorded as having been received?
geode-core/src/main/java/org/apache/geode/internal/cache/versions/RVVExceptionB.java