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

one use

	github.com/gotd/td/tg (current package)
		tl_update_slices_gen.go#L7424: func (s UpdateReadChannelDiscussionOutboxArray) Retain(keep func(x UpdateReadChannelDiscussionOutbox) bool) UpdateReadChannelDiscussionOutboxArray {