To make things more confusing, the Databricks SDK definition of `FileInfo` changes again:

@dataclass
class FileInfo:
    file_size: Optional[int] = None
    """The length of the file in bytes. This field is omitted for directories."""

    is_dir: Optional[bool] = None
    """True if the path is a directory."""

    modification_time: Optional[int] = None
    """Last modification time of given file in milliseconds since epoch."""

    path: Optional[str] = None
    """The absolute path of the file or directory."""

    def as_dict(self) -> dict:
        """Serializes the FileInfo into a dictionary suitable for use as a JSON request body."""
        body = {}
        if self.file_size is not None: body['file_size'] = self.file_size
        if self.is_dir is not None: body['is_dir'] = self.is_dir
        if self.modification_time is not None: body['modification_time'] = self.modification_time
        if self.path is not None: body['path'] = self.path
        return body

    @classmethod
    def from_dict(cls, d: Dict[str, any]) -> FileInfo:
        """Deserializes the FileInfo from a dictionary."""
        return cls(file_size=d.get('file_size', None),
                   is_dir=d.get('is_dir', None),
                   modification_time=d.get('modification_time', None),
                   path=d.get('path', None))