How effective is this? hg has added extra metadata on top with what we call "changeset evolution", which tracks this renaming information explicitly. git seems

How effective is this? hg has added extra metadata on top with what we call "changeset evolution", which tracks this renaming information explicitly. git seems to like to track stuff like this implicitly, such as renaming files. How effectively can you track commit rewriting if you don't have explicit metadata to help you?