def disable_bool_icon(
        fieldname: str,
        model) -> Callable[[Any], bool]:
    """
    Disable boolean icons for a Django ModelAdmin field.
    The '_meta' attribute is present on Django model classes and instances.

    model_class: ``Union[Model, Type[Model]]``

    ... only the type checker in Py3.5 is broken; see ``files.py``
    """
    # noinspection PyUnusedLocal
    def func(self, obj):
        return getattr(obj, fieldname)
    func.boolean = False
    func.admin_order_field = fieldname
    # func.short_description = \
    #     model._meta.get_field_by_name(fieldname)[0].verbose_name
    # get_field_by_name() deprecated in Django 1.9 and will go in 1.10
    # https://docs.djangoproject.com/en/1.8/ref/models/meta/

    # noinspection PyProtectedMember, PyUnresolvedReferences
    func.short_description = \
        model._meta.get_field(fieldname).verbose_name
    return func