Drain #101
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Drain #101
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`mapMaybe (const Nothing)` is often a constant map, and being able to provide a short-cut is useful (you may think it's never used, but consider `dropMissing` in `Data.Map.Merge.Strict`).
Add a law that any non-default definition should be extensionally the same as default one.
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Closes #95
Resolves #57. I don't add
Drainedclass now, as that addition would not be breaking one, so can be done later.