docs: def decode_datavalue(self,
                           datatype: str,
                           datavalue: Mapping[str, object]) -> object:
          """Decode the given ``datavalue`` using the configured
          :attr:`datavalue_decoder`.
  
          .. versionadded:: 0.3.0
  
          """
          decode = cast(Callable[[Client, str, Mapping[str, object]], object],
                        self.datavalue_decoder)
          return decode(self, datatype, datavalue)