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

one use

	github.com/gotd/td/tg (current package)
		tl_notification_sound_slices_gen.go#L247: func (s NotificationSoundRingtoneArray) Retain(keep func(x NotificationSoundRingtone) bool) NotificationSoundRingtoneArray {