code: def _convert(self, desired_type: Type[T], source_obj: S, logger: Logger, options: Dict[str, Dict[str, Any]]) -> T:
          
          pass
docs: Implementing classes should implement this method to perform the conversion itself
  
          :param desired_type: the destination type of the conversion
          :param source_obj: the source object that should be converter
          :param logger: a logger to use if any is available, or None
          :param options: additional options map. Implementing classes may use 'self.get_applicable_options()' to get the
          options that are of interest for this converter.
          :return: