There’s some inconsistency among the return types of these functions. Some return a `Maybe`

while others don’t.

```
-- returns Maybe
-- Data.Array
updateAt :: forall a. Int -> a -> Array a -> Maybe (Array a)
-- Data.List
updateAt :: forall a. Int -> a -> List a -> Maybe (List a)
-- returns original
-- Data.Array
updateAtIndices :: forall t a. Foldable t => t (Tuple Int a) -> Array a -> Array a
-- Data.List.Lazy
updateAt :: forall a. Int -> a -> List a -> List a
```

Should we make these more consistent, even if that involves a breaking API change and a tedious update of many packages?

Originally asked about this here, where a wider discussion was suggested.