title: PHP Symfony duplicate routes
body: <p>How can I create duplicate routes?</p>
  
  <p>I want to have SEO and user friendly routing like:</p>
  
  <ul>
  <li><code>/{product.slug}</code></li>
  <li><code>/{category.slug}</code></li>
  </ul>
  
  <p>But how does Symfony know which one to render? It now defaults to the last definition.</p>