You don't have mutable branches in Git, I think he refers to commits mercurial don't allow you to alter (public ones). Local branches in Hg is the same as book

You don't have mutable branches in Git, I think he refers to commits mercurial don't allow you to alter (public ones). Local branches in Hg is the same as bookmarks you havent pushed. Remote tracking branches in Hg would be bookmarks you have pushed.