def dictlist_convert_to_bool(dict_list: Iterable[Dict], key: str) -> None:
    """
    Process an iterable of dictionaries. For each dictionary ``d``, convert
    (in place) ``d[key]`` to a bool. If that fails, convert it to ``None``.
    """
    for d in dict_list:
        # d[key] = True if d[key] == "Y" else False
        d[key] = 1 if d[key] == "Y" else 0