[eeperson]

Why not just use 'git notes'? This seems like exactly the sort of use case that feature is for.

[Tobu]

Would notes survive a rebase workflow? (not that the original tip's empty commit does, which is quite a flaw)

[eeperson]

It appears that the notes survive a rebase but they don't point to anything in your history. They continue to point to a commit before the rebase.

[Tobu]

Too bad. As I understand it that's because rebase relies on the patch format as the full representation of a commit; but that excludes the commit's notes. replacement refs and grafts survive it in squashed form because they are part of the graph traversal.