[Haskell-cafe] Why is there no Zippable class? Would this work?

[Jules Bean]

Job Vranish wrote:
> I was needing a way to zip generic data structures together today and 
> was very annoyed to find that there is no Zippable class, or variant 
> there of.
> 

Notice that you can always do this if the LHS is traversable and the RHS 
is Foldable (as a special case the RHS is the same as the LHS, since all 
foldables are traversable) :

http://www.haskell.org/haskellwiki/Foldable_and_Traversable#Generalising_zipWith