docs: def normalized_operator(self):
          """Get the operator as one of LT, GT, LTE, or GTE."""
          if self._operator.lower() == "lt" or self._operator == "<":
              return u"LT"
          elif self._operator.lower() == "gt" or self._operator == ">":
              return u"GT"
          elif self._operator.lower() == "lte" or self._operator == "<=":
              return u"LTE"
          elif self._operator.lower() == "gte" or self._operator == ">=":
              return u"GTE"