[stolee]

The delta compression in Git is about storing the file contents of an object as a diff against another object. This changes the literal size on-disk, but it doesn't change the logical unit.

In fact, the delta chains used by Git for space compression have no direct relation to the object model DAG. From the perspective of a user using Git, these deltas are completely invisible.

Edit: perhaps to help this point... If Git stores an object using a delta, that doesn't change the object ID of that object compared to storing it uncompressed.

[tsimionescu]

Git internal delta compression has nothing to do with why Git commits are most usefully thought of as diffs. All git operations start by computing diffs between commits, and then trying to apply those diffs before conceptually taking a snapshot. It is quite likely that the textual diff used in the operation and the internal diff produced by the delta compression are entirely different.

[MaxBarraclough]

Respectfully, I already made all of those points quite explicitly.