Once again, reporting live from the because-you-can department:
Jeremy has created an initial implementation of multi-method dispatch in Joose. It allows you to define a set of methods in a class that have the same name but differ with respect to the signature of the argument types. Once you call such a method-name, the dispatcher will look for the most appropriate method (based on the runtime types of the parameters (Are they still parameters or are they already arguments at this stage? (I think still parameters))).
Here is a link to the raw test-suite, that is currently passing.