eneral rule, under the CLOS semantics a JSON <code class="json">Object</code> datum <var>D</var> is decoded to an instance <var>F</var> of an anonymous class <var>K</var>.  Such a class does not have a name which could be used as a method specializer, however, the user can always assume that <var>K</var> is a subclass of <code class="api-name">fluid-object</code> and an instance of the metaclass <code class="api-name">fluid-class</code>; that it has at least the slots named by the keys in <var>D</var> (whic