import typing

def packb(
        obj: typing.Union[
            None,
            bytes,
            typing.Dict[typing.Any, typing.Any],
            float,
            int,
            typing.Sequence[typing.Any],
            str,
        ],
        ext_handlers: typing.Optional[typing.Dict[str, typing.Any]] = None,
        force_flat_precision: typing.Optional[str] = None) -> bytes:
    ...


def unpackb(val: bytes) -> typing.Union[
        None,
        bytes,
        typing.Dict[typing.Any, typing.Any],
        float,
        int,
        typing.List[typing.Any],
        str,
]:
    ...