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There's good reason to believe this is simply historical accident. The Semialign class came first, and used to include zip and zipWith directly. When those members were separated out into their own...
Answer
#1: Initial revision
by
r~~
·
2024-02-15T02:03:25Z (10 months ago)
There's good reason to believe this is simply historical accident. The `Semialign` class came first, and used to include `zip` and `zipWith` directly. When those members were separated out into their own class, the motivation was types that had `align` but not `zip` (one example is [`NEMap`](https://hackage.haskell.org/package/nonempty-containers-0.3.4.5/docs/Data-Map-NonEmpty.html#t:NEMap)), so `Zip` got the superclass instead of `Semialign`. In retrospect, perhaps making the two classes independent and defining a laws-only subclass of both would have been better.