title: Ractive radio button binding - preserve name
body: <p>I understand that to bind a ractive variable to a radio-button, the easiest way is to have</p>
  
  <pre><code>&lt;input type="radio" name="{{myVar}}" value="1" checked&gt;
  </code></pre>
  
  <p>in the template, but the curly brackets on the name persist into the html.  Is there a clever way to get it to output</p>
  
  <pre><code>&lt;input type="radio" name="myVar" value="1" checked&gt;
  </code></pre>
  
  <p>in the html, so I don't have to alter the form-handling?  I've tried some logic along the lines of</p>
  
  <pre><code>&lt;input type="radio" name="myVar" value="1" {{#myVar==1}}checked{{/myVar==1}}
  </code></pre>
  
  <p>but that doesn't bind.</p>
  
  <p>Also, less importantly, is there a way to bind it as a numeric value, as if I have</p>
  
  <pre><code>data:{myVar:1}
  </code></pre>
  
  <p>Then the button doesn't get checked?</p>