docs: function (num, uppercase) {
          var	digits = String(+num).split(""),
          key = ["","c","cc","ccc","cd","d","dc","dcc","dccc","cm",
          "","x","xx","xxx","xl","l","lx","lxx","lxxx","xc",
          "","i","ii","iii","iv","v","vi","vii","viii","ix"],
          roman = "",
          i = 3;
          while (i--)
              roman = (key[+digits.pop() + (i * 10)] || "") + roman;
  
          var index = Array(+digits.join("") + 1).join("m") + roman;
          return uppercase ? index.toUpperCase() : index;
      }