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

one use

	github.com/gotd/td/tg (current package)
		tl_updates_channel_difference_slices_gen.go#L57: func (s UpdatesChannelDifferenceClassArray) Retain(keep func(x UpdatesChannelDifferenceClass) bool) UpdatesChannelDifferenceClassArray {