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

one use

	github.com/gotd/td/tg (current package)
		tl_input_notify_peer_slices_gen.go#L247: func (s InputNotifyForumTopicArray) Retain(keep func(x InputNotifyForumTopic) bool) InputNotifyForumTopicArray {