docs: def getserialized(self, key, decoder_func=None, **kwargs):
          """
          Gets the setting value as a :obj:`dict` or :obj:`list` trying :meth:`json.loads`, followed by :meth:`yaml.load`.
  
          :rtype: dict, list
          """
  
          value = self.get(key, cast_func=None, **kwargs)
  
          if isinstance(value, (dict, list, tuple)) or value is None:
              return value
  
          if decoder_func: return decoder_func(value)
  
          try:
              o = json.loads(value)
              return o
          except json.decoder.JSONDecodeError: pass
  
          try:
              o = yaml.load(value)
              return o
          except yaml.parser.ParserError: pass
  
          raise ValueError('Unable to parse {} setting using JSON or YAML.'.format(key))