title: How and where is my viminfo option set?
body: <p>As far as I can tell I don't set <code>viminfo</code> anywhere, yet it is set.</p>
  
  <pre><code>:verbose set viminfo?
  </code></pre>
  
  <p>prints</p>
  
  <pre><code>  viminfo='100,&lt;50,s10,h,rA:,rB:
      Last set from ~/vimfiles/vimrc
  </code></pre>
  
  <p>But <code>~/vimfiles/vimrc</code> doesn't set it.</p>
  
  <p>Even if I let <code>~/vimfiles/vimrc</code> set it to an arbitrary value, <code>viminfo</code> will still be set to <code>'100,&lt;50,s10,h,rA:,rB:</code>.</p>
  
  <p>Why is that and how can I set/unset <code>viminfo</code>? </p>