r> is a subclass of <code class="api-name">fluid-object</code>, <var>K</var> shall be additionally a direct subclass of <code class="api-name">fluid-object</code>.  Slots corresponding to all <code class="json">Member</code>s of <var>D</var> (except the prototype itself) shall be bound in <var>F</var>.</p>

<div class="example">
<pre class="in-code">
(defclass sample-2 ()
  ((frob :initform 'xyzzy)))
</pre>
<pre class="value">#&lt;STANDARD-CLASS SAMPLE-2&gt;</pre>

<pre class="in-code">
(json:with-decoder-s