Why do you care about the order of packages in Packages? In my personal case, so that when I build a repository which has some new packages and some old packag

Why do you care about the order of packages in Packages? In my personal case, so that when I build a repository which has some new packages and some old packages, when I look at the resulting pull request in github I can see that the packages which haven't changed have indeed not changed. What does "build reproducibly" even mean in this context? Two repositories with the same packages have identical Packages files. Or for me, slightly more generally, when the Packages file changes, it changes as minimally as possible.