title: How to specify path like /pets/{id} but with multiple ids?
body: <p>I want to create a path which accepts any number of IDs separated with commas. It should accept all the following:</p>
  
  <pre><code>GET /pets/1,2  # returns info about pets with ids 1, 2
  GET /pets/4,10,12,124,2  # same, for pets with ids 4, 10, 12, 124, 2
  </code></pre>
  
  <p>The book "building apis you won't hate" gave me this idea.
  How do I do that in swagger?</p>