It's not really deep comparison, it uses the Eq class (==) function. For the primitives, it's by value. For ADTs that derive Eq, it checks equality for all of the values in the ADT, which functions that same as deep comparison.
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Wasn't aware that Haskell's equality operator did deep comparision, but that makes sense. Thanks!
I'd probably rewrite this with the O(a + b) algorithm from the other solution.
It's not really deep comparison, it uses the Eq class (==) function. For the primitives, it's by value. For ADTs that derive Eq, it checks equality for all of the values in the ADT, which functions that same as deep comparison.