[eru]

You are right. But it's the same roundabout way that git is using.

Older version control systems like subversion used to store diffs.

Users of Git care a lot of about diffs between versions. And typically treat a specific commit as if it was a diff. Commands like 'git cherry-pick' re-inforce that notion.

However, internally each git commit is a complete snapshots of the state of the repository. Diffs are created on the fly as derived data.

Now even more internally, git does store snapshots as mostly as deltas. But to close the circle: those deltas have nothing to do with the diffs that users see.

This sounds very roundabout, but results in a simple and performant system, that doesn't ask the user to make compromises.

My suggestion for static libraries was along the same lines, if a bit clumsier.