def raw_poly_to_mask(poly):
    """
    There's not currently much metadata attached to masks, but this is
    around if we ever decide that we need to implement more
    complicated masking schemes.

    In particular, we might want to store also whether the interior
    or exterior is the masked region, but this is functionally achieved
    for now with the `invert` flag in other functions.

    :param poly: Polygon implementing a masked region.
    :return:
    """
    return {'poly': poly}
