title: When listing remote tags in git, what does "^{}" signify?
body: <p>When I do <code>git ls-remote --tags</code> to list remote tags, I'm getting a response like this:</p>
  <pre><code>45d3d8f01f5e07a0e2728012b3d50989e5971cb2        refs/tags/v1.4.6.7
  c742bfaa5d2140bbbed5bb9202b30cabcb9eb531        refs/tags/v1.4.6.7^{}
  a745b6d8997803e1af823582885ab17f0dba2d8e        refs/tags/v1.4.6.8
  b867af5cb9469f6cfc139d355a5e7e4fc9b55a12        refs/tags/v1.4.6.8^{}
  </code></pre>
  <p>What does the <code>^{}</code> signify (and should I be concerned)?</p>