title: Homebrew updates and app self updates
body: <p>How does homebrew/cask's updates work if the app auto updates itself.</p>
  
  <p>Example: Chrome or Firefox</p>
  
  <p>These two apps auto update themselves.</p>
  
  <p>But what happens when you run a brew update?</p>
  
  <p>Does it detect that it is already updated or does it check an internal list of apps it installed (misses that it is already updated) and reupdates the app></p>