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

one use

	github.com/gotd/td/tg (current package)
		tl_auth_authorization_slices_gen.go#L247: func (s AuthAuthorizationSignUpRequiredArray) Retain(keep func(x AuthAuthorizationSignUpRequired) bool) AuthAuthorizationSignUpRequiredArray {