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

one use

	github.com/gotd/td/tg (current package)
		tl_input_store_payment_purpose_slices_gen.go#L437: func (s InputStorePaymentPremiumGiveawayArray) Retain(keep func(x InputStorePaymentPremiumGiveaway) bool) InputStorePaymentPremiumGiveawayArray {