title: What's the purpose of git-mv?
body: <p>From what I understand, Git doesn't really need to track <em>file</em> rename/move/copy operations, so what's the real purpose
  of <a href="https://git-scm.com/docs/git-mv" rel="noreferrer"><code>git mv</code></a>? The man page isn't specially descriptive...</p>
  <p>Is it obsolete? Is it an internal command, not meant to be used by regular users?</p>