docs: def formfield(self, **kwargs):
          """
          :returns: A :class:`~django.forms.FloatField` with ``max_value`` 180 and
              ``min_value`` -180.
          """
          kwargs.update({
              'max_value': 180,
              'min_value': -180,
          })
          return super(LongitudeField, self).formfield(**kwargs)