@vadler We discussed this already via email and I don't want to be a pest, but what is the reason for keeping the preliminary ClassVersion 12. It will never be used by anybody, it's in not clear how to correctly define an IOREAD rule for it (or at least it is not clear to me), and most importantly, the preliminary ClassVersion 12 ended up in 710pre7 basically by accident (the PR was approved and merged before we finished discussing offline how to best incorporate the updated jet flavor information in the pat::Jet class). In addition, there are also backport PRs in which one would go from ClassVersion 11 to 13 for no good reason. Is there some formal rule about ClassVersions in pre-releases that I'm breaking by just updating the checksum between two pre-releases?