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It's better because it doesn't require messing around with, or even being aware of the internals of the code it's being connected to. It's actually a lot like a Common Lisp :before method, which I've found really bloody useful on a few occasions.

CL's customizable generic dispatch is just more than :before :-) the whole thing is just tasty.

Indeed. If I ever design a general-purpose language, you can bet on it having something of that sort.

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