title: How do I specify a mix of an expression and a string as a class for an ember component?
body: <p>I want to do something like this</p>
  
  <pre><code>{{#my-custom-component class="some-class-name {{dynamicProperty}}" }}
  </code></pre>
  
  <p>But this is literally rendering <code>some-class-name {{dynamicProperty}}</code> as the classname, rather than the value it represents.</p>