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

one use

	github.com/gotd/td/tg (current package)
		tl_input_media_slices_gen.go#L1003: func (s InputMediaDocumentExternalArray) Retain(keep func(x InputMediaDocumentExternal) bool) InputMediaDocumentExternalArray {