title: Jekyll site data with dots in identifier
body: <p>Assume you have a JSON file <code>_data/test.json</code> with the following content</p>
  
  <pre><code>{"foo.bar":"42"}
  </code></pre>
  
  <p>and you want to query it in Jekyll/Liquid. A naive try would look like:</p>
  
  <pre><code>{{ site.data.test."foo.bar" }}
  </code></pre>
  
  <p>which does not work. Any idea how to look up "foo.bar"?</p>
  
  <p>I'm using Jekyll 3.8.</p>