rev:       e.Kv.ModRevision,
		isDeleted: e.Type == clientv3.EventTypeDelete,
		isCreated: e.IsCreate(),
	}
	if e.PrevKv != nil {
		ret.prevValue = e.PrevKv.Value
	}
	return ret, nil
}

func progressNotifyEvent(rev int64) *event {
	return &event{
		rev:              rev,
		isProgressNotify: true,
	}