RE: RFC 265 (v3) Interface polymorphism considered lovely

> Java is one language that springs to mind that uses interface
> polymorphism. Don't let this put you off -- if we must steal something
> from Java let's steal something good.

Interface inheritance is probably the least dignified thing to steal from Java. 
If we have true multiple inheritance, interfaces don't apply. (As a C++ 
programmer, I've always had to consider the interface OOP of Java and Delphi as 
flawed and incomplete. By golly, a dog CAN be a furred animal AND a four legger 
without having to define one or the other entirely in each class where I want 
either a furred animal and a four legger.) We already have true multiple 
inheritance. Therefore, interface OOP is unnecessary. However, some syntactic 
sugar to accomplish what you are looking for might be in order. Maybe 
implements() or isa()? (Is a())