docs: function Stats(state) {
    this.state = state;
    this.clear();
    this.onConnect = onConnect.bind(this);
    this.onDisconnect = onDisconnect.bind(this);
    this.onRejected = onRejected.bind(this);
    this.onHit = onHit.bind(this);
    this.onMiss = onMiss.bind(this);
    this.onExpired = onExpired.bind(this);
    this.onExpired = onExpired.bind(this);
    this.addStateListeners();
  }