... | ... | @@ -46,6 +46,8 @@ There are a number of concerns with the generalizations proposed for GHC 7.10. S |
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- It should also be noted that `Traversable` can be added to `Prelude` without adding `Foldable`. Today `Foldable` is a superclass of `Traversable`, but there is no real need for that. (E.g., building the lens package and all its dependencies only requires 9 trivial changes when `Foldable` is no longer a superclass.)
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- Containers with a constrained element type (e.g. `StorableVector`, `Vector.Storable` and `Vector.Unboxed`) cannot be made instances of the `Foldable` class.
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## Concerns for the ecosystem
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