title: Ruby: Integer as key in hash
body: <p>I need hash like: </p>
  
  <p><code>name[13][:sub_param1]</code> <code>name[13][:sub_param2]</code></p>
  
  <p>I've tried:</p>
  
  <pre><code>name = {13: {sub_param1 =&gt; 123}}
  </code></pre>
  
  <p>But it is only possible if 13: is '13': (string)</p>