func Setter(s NonceSetter) Option {
	return Option{func(o *options) {
		o.setter = s
	}}
}
func Setter(s NonceSetter) Option {
	return Option{func(o *options) {
		o.setter = s
	}}
}
// Setter allows the user to set the method by which a nonce is stored in
// the outgoing response.