Continue to improve map functions #315
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Rewrite `unionWith`, `intersectionWithKey`, etc., as independent functions. Writing either in terms of the other leads to closures being allocated with extra indirection for the passed function. `mergeWithKey` misses singleton optimizations for unions. For the rest, I think `mergeWithKey` is hard to understand, and it's not immediately obvious how the parts are supposed to fit together. Since it's used only to reduce *source* code size, and not actual *generated* code size, I'd rather avoid it for the most part. I've left `differenceWith` and `differenceWithKey` alone, as they appear to be rather deeply tied to the concepts in `mergeWithKey`.
* Continue set and map combination rewrites. * Add bias tests to `Data.Set` suite. * Replace `Arbitrary` instance for sets. * Use specialized function to produce pairs of sets for combination tests. This is a horribly large and incomplete commit, but it all works and I need to move on to some other things. Sorry, world.
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Rewrite
unionWith,intersectionWithKey, etc., as independentfunctions. Writing either in terms of the other leads to closures
being allocated with extra indirection for the passed function.
mergeWithKeymisses singleton optimizations for unions. For therest, I think
mergeWithKeyis hard to understand, and it's notimmediately obvious how the parts are supposed to fit together.
Since it's used only to reduce source code size, and not actual
generated code size, I'd rather avoid it for the most part.
I've left
differenceWithanddifferenceWithKeyalone, as theyappear to be rather deeply tied to the concepts in
mergeWithKey.