I think EnPissant has a point regarding the overhead. Mapping semantic dependencies at the patch layer sounds great in theory, but the computational cost of resolving those graphs in a repository with thousands of changes is non-trivial.

In my work with high-performance engines, 'on-the-fly' graph resolution is usually the first thing to hit a performance wall compared to simple snapshot-based lookups. Pijul is a brilliant experiment in Category Theory applied to VCS, but until it can demonstrate that it doesn't degrade linearly with history size, Git's 'dumb' but fast snapshots will likely win the network effect battle.

Edit: had another try. It seems to work now, very interesting