Note that here I talk about commits and not git state. I don't even know
if talking about global commits diff like a git state diff make sense as
commits happening between the first and last known to date verifier can contain commits from other users.
I thought about adding the following convention:
> Current convention is such that if a folder exists but just contains `.gitkeep`, it means that everything that could fall into this folder and isn't existing is considered as verified.
This would be useful for personal git users, but it's an edge case and
would anyway need to precise an overwhole git user gits hash to confirm
a statement at a given gits state.
So let's keep the same convention for every git.
