> They're (often) packfiles, which are a delta encoding i.e. a diff. …appealing to "the bits on disk" is wrong. That's fair. The diffs in a packfile have no r

> They're (often) packfiles, which are a delta encoding i.e. a diff. …appealing to "the bits on disk" is wrong. That's fair. The diffs in a packfile have no relation to the "diff" that a commit would be if the commit were a diff; so it's wrong to use "but packfiles" when arguing that commits are diffs and not snapshots; but you're right, packfiles make my "bits on disk" argument not quite right. The way I look at it is that packfiles are a compression mechanism; and they don't alter the fact that fundamentally it's snapshots that are being compressed. But that's not the only way of looking at it.