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Can you help me understand what you mean here? The author manages to make something match `case NotIterable()` by...modifying the `NotIterable(ABC)` class. That's exactly what I would have expected. What you mean by "one doesn't need to touch ClassA, or any descendants of it, at all."?

Not quite! The point of the article is that you don’t need to change the class of obj to override this instance check. If you have a look, ClassA always uses the hook implementation in the examples. And this can be shortened to just using instancecheck.

Right, but, what's the problem with that?