Michael Ströder

I agree this should be fixed, especially this module is used in many other stacks. Sets with mixed string types seem totally broken to me. Maybe a custom set-class instead...

I tried to fix this but I give up for now due to lack of time. This seems really seriously broken! This whole module package serves as a good example...

> Thanks, please add a note to `docs/upgrading.rst` Adding such a note would require coordinating the release version. For which release would you accept this change?