function getLowestTypeIndex (param) {
      var min = 999;

      for (var i = 0; i < param.types.length; i++) {
        if (isExactType(param.types[i])) {
          min = Math.min(min, param.types[i].typeIndex);
        }
      }

      return min;
    }
Find the lowest index of all exact types of a parameter (no conversions)
@param {Param} param
@return {number} Returns the index of the lowest type in typed.types