transpose?

Is there any interest in adding ```transpose``` to arrays?  Not sure what would be a good implementation but possibly something along the lines of:

```purescript
transpose :: forall a. Array (Array a) -> Array (Array a)
transpose x = 
  case head x of 
    Just [_] -> 
      x
    _ -> 
      (mapMaybe head x) : transpose (mapMaybe tail x)
```