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

one use

	github.com/gotd/td/tg (current package)
		tl_notify_peer_slices_gen.go#L247: func (s NotifyForumTopicArray) Retain(keep func(x NotifyForumTopic) bool) NotifyForumTopicArray {