def get_bounding_box(self) -> Union[Tuple[int, int], Tuple[int, int, int, int]]:
"""Retrieve the maximum bounding box of any glyph in the font.
def get_bounding_box(self) -> Union[Tuple[int, int], Tuple[int, int, int, int]]:
"""Retrieve the maximum bounding box of any glyph in the font.