code: @InterfaceAudience.Private
      public void setLastSequence(String lastSequenceIn) {
          if (lastSequenceIn != null && !lastSequenceIn.equals(lastSequence)) {
              Log.v(Log.TAG_SYNC, "%s: Setting lastSequence to %s from(%s)", this, lastSequenceIn, lastSequence);
              lastSequence = lastSequenceIn;
              if (!lastSequenceChanged) {
                  lastSequenceChanged = true;
                  synchronized (executor) {
                      if (!executor.isShutdown()) {
                          executor.schedule(new Runnable() {
                              public void run() {
                                  saveLastSequence();
                              }
                          }, SAVE_LAST_SEQUENCE_DELAY, TimeUnit.SECONDS);
                      }
                  }
              }
          }
      }
docs: in CBL_Replicator.m
  - (void) setLastSequence:(NSString*)lastSequence;
  
  @exclude