title: Shortcode with parametar, but no attribute
body: <p>Title probably sounds a bit odd, sorry about that.</p>
  
  <p>I have to use shorcode similar to this this one (simplified):</p>
  
  <pre><code>[name=John]
  </code></pre>
  
  <p>to return "Hi John".</p>
  
  <p>I know how I would do this if shortcode was </p>
  
  <pre><code>[name first="John"]
  </code></pre>
  
  <p>but is it possible to get value "John" somehow in the code in my first example?</p>
  
  <p>I tried to use </p>
  
  <pre><code>$a=shortcode_atts(array(
      'name'      =&gt; '',
  ), $atts);
  </code></pre>
  
  <p>but that didn't work.</p>