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module-local as in, creating a new type that can't be exchanged with the outside? Or converting the value's type on the fly when it gets passed somewhere else? I doubt either would be very usable.

Edit: the page refers to open classes, and I think the idea is that you can redefine methods on Object and have it apply to every object.

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my understanding is that the method call is statically dispatched, and the dispatch is tweaked per module.

So, if I pass a String to your api and you invoke method X it will invoke the one redefined in your module, while outside it stays the same (more like scala implicits than ruby's open classes).

EDIT:

to clarify how I understand this: the authors have basically decided that the module is the element of behavior specialization, and method calls are basically static functions with syntax sugar, and a class is only a data container with some default implementations for the functions.

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