How to use the datafiles.utils.recursive_update function in datafiles

def _get_data(self, include_default_values: Trilean = None) -> Dict:
        log.debug(f'Preserializing object to data: {self._instance!r}')
        if include_default_values is None:
            include_default_values = self.defaults

        if self.auto_attr:
            data = recursive_update(self._last_data, self._instance.__dict__)
        else:
            data = recursive_update(self._last_data, dataclasses.asdict(self._instance))

        for name in list(data.keys()):
            if name not in self.attrs:
                log.debug(f'Removed unmapped attribute: {name}')
                data.pop(name)

        for name, converter in self.attrs.items():
            value = data[name]

            if getattr(converter, 'DATACLASS', None):
                log.debug(f"Converting '{name}' dataclass with {converter}")
                if value is None:
                    value = {}

def _get_data(self, include_default_values: Trilean = None) -> Dict:
        log.debug(f'Preserializing object to data: {self._instance!r}')
        if include_default_values is None:
            include_default_values = self.defaults

        if self.auto_attr:
            data = recursive_update(self._last_data, self._instance.__dict__)
        else:
            data = recursive_update(self._last_data, dataclasses.asdict(self._instance))

        for name in list(data.keys()):
            if name not in self.attrs:
                log.debug(f'Removed unmapped attribute: {name}')
                data.pop(name)

        for name, converter in self.attrs.items():
            value = data[name]

            if getattr(converter, 'DATACLASS', None):
                log.debug(f"Converting '{name}' dataclass with {converter}")
                if value is None:
                    value = {}

                for field in dataclasses.fields(converter.DATACLASS):
                    if field.name not in value: