docs: def _items(self, type_filter=None, name=None):
          """
          Args:
              type_filter(list): Optional iterable of types to return (GroupDict only)
              name(str): Only return key by this name
  
          Alternative generator for items() method
          """
  
          if name:
              if type_filter and self._key_attr == 'type':
                  if name in type_filter and name in self:
                      yield name, self[name]
              elif name in self:
                  yield name, self[name]
  
          elif type_filter and self._key_attr == 'type':
              for key, val in self.items():
                  if key in type_filter:
                      yield key, val
          else:
              for key, val in self.items():
                  yield key, val