See here: https://github.com/BartoszMilewski/Okasaki/issues/1#issuecomment-164554799 https://github.com/BartoszMilewski/Okasaki/issues/1#issuecom... This guy

See here: https://github.com/BartoszMilewski/Okasaki/issues/1#issuecomment-164554799 https://github.com/BartoszMilewski/Okasaki/issues/1#issuecom... This guy knows what he is talking about. His blog has a lot of interesting discussion in this area.