That's mentioned in the article. It gives Haskell's null handling a score of 5 stars, along with OCaml and Standard ML. EDIT: The articles definition of 5 star

That's mentioned in the article. It gives Haskell's null handling a score of 5 stars, along with OCaml and Standard ML. EDIT: The articles definition of 5 star null handling is "Does not have NULL." :)