def METHOD_NAME(mounts: Union[None, Mount, List[Mount], Tuple[Mount]]) -> None:
    if isinstance(mounts, (list, tuple, set)):
        mount_paths = [mount.mount_path for mount in mounts]
        if len(set(mount_paths)) != len(mount_paths):
            raise ValueError("Every Mount attached to a work must have a unique 'mount_path' argument.")