docs: def formfield(self, **kwargs):
          """
          :returns: A :class:`~django.forms.FloatField` with ``max_value`` 90 and
              ``min_value`` -90.
          """
          kwargs.update({
              'max_value': 90,
              'min_value': -90,
          })
          return super(LatitudeField, self).formfield(**kwargs)