title: How to set git to prune on pull globally
body: <p>With the command:</p>
  
  <pre><code>git config remote.origin.prune true
  </code></pre>
  
  <p>you can configure a repo to automatically prune on every pull request <a href="https://stackoverflow.com/questions/18308535/automatic-prune-with-git-fetch-or-pull">as per this question</a>.</p>
  
  <p>I always want this option to be set.  Does anyone know a way to set this globally for all repos' remote origins or is the only option to perform it per repo?</p>