next property
      
      T
      get
      next
      
    
    
    
Implementation
T get next {
  if (_idx >= _vals.length) {
    _idx = 0;
  }
  return _vals[_idx++];
}T get next {
  if (_idx >= _vals.length) {
    _idx = 0;
  }
  return _vals[_idx++];
}