title: rails check_box_tag set checked with default value
body: <p>I currently have a rails check_box_tag call that looks like</p>
  
  <pre><code>check_box_tag #{name}
  </code></pre>
  
  <p>I want to include a checked attribute, which I know I can do with</p>
  
  <pre><code>check_box_tag name, value, checked
  </code></pre>
  
  <p>But what if I want to set it to checked without explicitly specifying <code>value</code> (I just want to use the default). Or similarly, what if I wanted to specify html options without specifying the <code>checked</code> attribute. Is there a way to do this?</p>