consider this interesting discussion: https://github.com/BartoszMilewski/Okasaki/issues/1#issuecomment-164554799 https://github.com/BartoszMilewski/Okasaki/iss

consider this interesting discussion: https://github.com/BartoszMilewski/Okasaki/issues/1#issuecomment-164554799 https://github.com/BartoszMilewski/Okasaki/issues/1#issuecom... his blog has more details