Indexable and Lookup for Generic Vectors.

[Boarders]

Would it be possible to add instances for indexing into a Generic vector so that these type classes can be used with Unboxed or Storable vectors? Similarly would it be possible to do the same with other kinds of arrays?

I realise keys is based around Haskell functors and these things are not functors in that sense (they are, I suppose, functors on mythical categories of Unboxed types, though I wouldn't wish to be quoted on that).