title: req.params.number is string in expressjs?
body: <p>I am writing expressjs app. is req.params.anything always string and not number
  suppose if I pass a number for user_id it's typeof is always string.</p>
  
  <pre><code>app.get('user/:user_id', function(req, res){
    console.log(typeof req.params.user_id);
  });
  </code></pre>
  
  <p>GET user/21</p>
  
  <p>this logs string.</p>
  
  <p>So is it always type string for req.params.x?</p>