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Actually you could argue that standard CLOS has the same abltiiy as Ruby, well at least the result is almost the same.In CLOS, you can redefine a class and that will take effect even in the running program with objects already instantiated. This means that if one decides to add a new slot to a class, one adds the slot definition, re-evaluate the defclass and voila, you may access the new slots in any object, and you do not have to use any special classes or MOP or anything to achieve the effect.
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