Refs -- Stopped inheriting from FieldGetDbPrepValueMixin by PostgresOperatorLookup.
@@ -309,7 +309,7 @@ class FieldGetDbPrepValueIterableMixin(FieldGetDbPrepValueMixin):
return sql, tuple(params)
-class PostgresOperatorLookup(FieldGetDbPrepValueMixin, Lookup):
+class PostgresOperatorLookup(Lookup):
"""Lookup defined by operators on PostgreSQL."""
postgres_operator = None
