I assume you’re referring to packfiles[1], but those are (a) very much an implementation detail (they exist only to save disk space and appear basically nowhere

I assume you’re referring to packfiles[1], but those are (a) very much an implementation detail (they exist only to save disk space and appear basically nowhere in the git UI), and (b) not diffs—git will pack together whatever blobs its heuristics[2] think “look similar” with no regard for whether they’re actually related to each other, as long as they seem likely to gzip well together. [1] https://git-scm.com/book/en/v2/Git-Internals-Packfiles https://git-scm.com/book/en/v2/Git-Internals-Packfiles [2] https://github.com/git/git/blob/master/Documentation/technical/pack-heuristics.txt https://github.com/git/git/blob/master/Documentation/technic...