There's also a long-standing branch by a major contributor (but with some kind of complicated politics that someone else can probably better explain) which has a non-zipped non-churny on-disk format specifically to allow using version control.
(I think it's called linkstage3, but it's been a long time, I keep trying and failing to get on with FreeCAD, always end up back using Fusion360. Not that that works well with git of course, I just can manage to actually design stuff.)