docs: def _get_choices(self):
          """
          Returns menus specified in ``PAGE_MENU_TEMPLATES`` unless you provide
          some custom choices in the field definition.
          """
          if self._overridden_choices:
              # Note: choices is a property on Field bound to _get_choices().
              return self._choices
          else:
              menus = getattr(settings, "PAGE_MENU_TEMPLATES", [])
              return (m[:2] for m in menus)