for a table if certain keys
are not found in the original table. This allows many similar tables to share
contents without duplicating memory.
</p>
<pre class="mendoza-codeblock"><code data-language="janet"><span class="mdzsyn-comment"># Simple Object Oriented behavior in Janet</span>
(<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">proto1</span> @{<span class="mdzsyn-keyword">:type</span> <span class="mdzsyn-keyword">:custom1</span>
              <span class="mdzsyn-keyword">:behave</sp