span class="mdzsyn-comment"># 0.840188</span>
(<span class="mdzsyn-symbol">c2</span> <span class="mdzsyn-keyword">:serial-number</span>) <span class="mdzsyn-comment"># 0.394383</span>
(<span class="mdzsyn-symbol">c3</span> <span class="mdzsyn-keyword">:serial-number</span>) <span class="mdzsyn-comment"># 0.783099</span></code></pre><p>One could also define a set of macros for creating objects with useful factory
functions, methods, and properties. The core library does not currently provide
such functionali