[Haskell-cafe] Byte Histogram

[Andrew Coppin]

> I think haskell2010's type system is just not expressive enough to
> create interface generic enough. It's not possible to create type class
> which will work for both ByteStrings (or IntSet) and lists.

It seems that most people agree: The reason why we don't have container 
classes is that it's difficult to define them in a completely type-safe 
mannar.

(The OOP people, of course, just don't bother trying. They use typecasts 
everywhere...)

Do associated types solve this? Or are there still problems?