For the lawmaking I follow, many of the systems in use tend to share some rudimentary ideas of version control, but they are all awfully bad at this job. I suppose the problem is that amendments and related important things are often done in closed-door cabinets; hence, it is often difficult if not impossible to determine (without leaks) who amended what and why (and/or was lobbied to do so). This issue is something I've long considered to be problematic for democracy, but politicians have their own reasons to disagree.