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I see that appeal of Haskell, and I think the strict focus on typing does catch many possible bugs... but I don't think it catches all the types of bugs that an actual unit test would, so I'm almost afraid that it's leaned on a bit too much.

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> but I don't think it catches all the types of bugs that an actual unit test would

You are correct. Likewise types can catch some bugs that unit tests cannot.

There is always a unit test which could catch any type mismatch. The problem is that every type declaration implies a set of unit tests (probably an unbounded set!) and in practice it's not likely you'll actually write enough of them.

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