def convert_qs_bool(qs_dict):
    """
    Convert any boolean `True` values in a querystring dictionary to empty strings

    Other values are unchanged.
    """

    qs_dict = qs_dict.copy()

    for param in qs_dict.keys():
        if qs_dict[param] is True:
            qs_dict[param] = ''

    return qs_dict