code: func parseKV(kv *mvccpb.KeyValue) *event {
  	return &event{
  		key:       string(kv.Key),
  		value:     kv.Value,
  		prevValue: nil,
  		rev:       kv.ModRevision,
  		isDeleted: false,
  		isCreated: true,
  	}
  }
docs: // parseKV converts a KeyValue retrieved from an initial sync() listing to a synthetic isCreated event.