code: def representCleanOpenAPIOperation(dumper, data):
      
      dct = _orderedCleanDict(data)
      if '_extended' in dct:
          for k, ext in list(data._extended.items()):
              dct[k] = ext
          del dct['_extended']
  
      return dumper.yaml_representers[type(dct)](dumper, dct)
docs: Unpack nonstandard attributes while representing an OpenAPIOperation