[kadoban]

Git itself requires you be able to think of it as both models, diffs and snapshots. For example most uses of `git rebase` are clearer if your mental model while doing so are of diffs.

That only one is how it's implemented is besides the point really, until you get _quite_ low level.

[matthiasv]

Of course when working with Git it makes sense to think in changesets. But OP was specifically modelling the technical side starting with "We have files, which are inert objects …".