)

type event struct {
	key              string
	value            []byte
	prevValue        []byte
	rev              int64
	isDeleted        bool
	isCreated        bool
	isProgressNotify bool
	// isInitialEventsEndBookmark helps us keep track
	// of whether we have sent an annotated bookmark event.
	//
	// when this variable is set to true,
	// a special annotation will be added