I agree that bitkeeper should change from master/slave if they so desire. I'm not aware of anyone using master/slave in terms of git or any other mainstream vcs

I agree that bitkeeper should change from master/slave if they so desire. I'm not aware of anyone using master/slave in terms of git or any other mainstream vcs. And github's specific use of master does not use slave. By changing it, they do seem to imply that they meant it in terms of master/slave though. Branches are not slaves to a master. In standard usage, a branch overwrites the master.