code: func newSyncSession(node net.IP, id SyncSessionID) *syncSession {
  	return &syncSession{
  		id:         id,
  		node:       node,
  		desync:     true,
  		startTime:  time.Now(),
  		expiryTime: time.Now().Add(sessionDeadtime),
  		notes:      make(chan *SyncNote, sessionNotesQueueSize),
  	}
  }
docs: // newSyncSession returns an initialised synchronisation session.