message: Initialize reference sequence number.
diff: @@ -28,6 +28,7 @@ export class DeltaConnection implements IDeltaConnection {
  this.minSequenceNumber = sequenceNumber;
  this.rangeTracker = new RangeTracker(documentSequenceNumber, sequenceNumber);
  + this.refSequenceNumber = documentSequenceNumber;
  }
  public on(event: string, listener: (...args: any[]) => void): this {
  