> MIT Scheme has an object system, but it isn't used for that. I'm not > sure why. But since we don't have a standardized Scheme object system > yet, the alist seems like the best lightweight and portable alternative. If the custom methods are stored in an alist, how do users of the port call them? Is it like (call-port-method port 'method args...), or is there a fixed set of methods per each version of MIT Scheme?
