Along the same lines: it's considered good practice to perform a refactoring in a separate commit from code which changes behavior. This makes it much easier to

Along the same lines: it's considered good practice to perform a refactoring in a separate commit from code which changes behavior. This makes it much easier to review the code, as you can look at the changes in isolation. If you refactor and then change behavior in a single commit, it can result in a very confusing change.