[Reventlov]

It is true. The original post writes about reproducing the minimal iso, which contains probably around 1% of the packages in nixpkgs. The remaining packages are not tested regarding binary reproducibility, or, at least, not in a systematic manner, which means regressions may happen regularly (which is exactly what happened with the .iso, see the previous announcement from 2021: https://discourse.nixos.org/t/nixos-unstable-s-iso-minimal-x... .)

[raboof]

While I would love testing reproducibility more systematically, it would not really have helped for the Python 3.10 regression: in this case we knew full well that it would break reproducibility even before we merged the change, but the performance advantage it unlocked seemed too big to ignore. Such trade-offs are luckily rare - I'm happy that with Python 3.11 we can now have both :)