Sure, it used to mean that, in the days of CVS. But a github-style fork is a fully independent project in theory, it could go anywhere. It doesn't have to rein

Sure, it used to mean that, in the days of CVS. But a github-style fork is a fully independent project in theory, it could go anywhere. It doesn't have to reintegrate. It might out-speed the main project and come to replace it. It might change emphasis and shoot off on a tangent. It's not really the same thing as having a copy of the source and making some private changes.