anchor.diff:  }
   
   class $PyNum {
  -    var _value, type;
  +    var _value;
   
       $PyNum(value) {
           switch ($getType(value)) {
  
positive.code:             default:
                  throw "Invalid input for num conversion";
          }
  
          if (_value is double)
              type = 0;
          else
              type = 1;
      }
  
      value() => _value;
  
negative.code:     operator /(other) {
          var result;
  
          if (_value is double || other.value() is double)
              result = _value / other.value();
          else
              result = _value ~/ other.value();
  