docs: function () {
        var ran = Math.floor(Math.random() * 3);
        if (ran == 0) {
          return publicRuleMethods.str.apply(this, arguments);
        }
        if (ran == 1) {
          return publicRuleMethods.num.apply(this, arguments);
        }
        if (ran == 2) {
          return publicRuleMethods.bool.apply(this, arguments);
        }
      }