Message.Reactions not working properly

[colecrouter]

Message.Reactions only returns reactions received since the program started.

On the other hand, func (s *Session) MessageReactions(channelID, messageID, emojiID string, limit int, beforeID, afterID string) (st []*User, err error) fetches all reactions.

Also, the documentation implies the last two args are optional, but I can't get it to compile without them present. Also beforeID's type is not specified? Not sure if that's intentional?