func makeAddressable(v reflect.Value) reflect.Value {
	if v.CanAddr() {
		return v
	}
	vc := reflect.New(v.Type()).Elem()
	vc.Set(v)
	return vc
}
func makeAddressable(v reflect.Value) reflect.Value {
	if v.CanAddr() {
		return v
	}
	vc := reflect.New(v.Type()).Elem()
	vc.Set(v)
	return vc
}
// makeAddressable returns a value that is always addressable.
// It returns the input verbatim if it is already addressable,
// otherwise it creates a new value and returns an addressable copy.