[arxanas]

I see that the README is unclear or even misleading on this point. How it works is that, upon each command, the commit corresponding to the working copy is updated in a similar way as `git commit --amend`. You will typically only have one "working copy commit", which corresponds to "unstaged changes" in Git. The difference is that instead of using special-purpose commands like `git add` to interact with the staging area, you instead use the same set of commands that you would use to manipulate other commits. (There is a `jj commit` convenience command to model the common case of adding a commit message to the working copy commit and then creating a new working copy commit on top of it.)