github.com/gotd/td/tg.MessageMediaGiveawayArray.Retain (method)

one use

	github.com/gotd/td/tg (current package)
		tl_message_media_slices_gen.go#L1333: func (s MessageMediaGiveawayArray) Retain(keep func(x MessageMediaGiveaway) bool) MessageMediaGiveawayArray {