anchor.diff:      final _stop, _step;
   
       $RangeIterator(pos, stop, step) : _stop = stop, _pos = pos - step, _step = step;
  -
       get current => _pos;
   
       bool moveNext() {
  
positive.code:     var _value, type;
  
      $PyNum(value) {
          type = $getType(value);
  
          switch (type) {
              case 6:
                  _value = value;
                  break;
  
negative.code:     operator /(other) {
          var result;
  
          if (type == 0 || other.type == 0)
              result = _value / other.value();
          else
              result = _value ~/ other.value();
  