endoza-code">set</code> special form also works for setting bytes in a buffer.
</p>
<pre class="mendoza-codeblock"><code data-language="janet">(<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">b</span> <span class="mdzsyn-string">@""</span>)
(<span class="mdzsyn-coresym">set</span> (<span class="mdzsyn-symbol">b</span> <span class="mdzsyn-number">0</span>) <span class="mdzsyn-number">97</span>) <span class="mdzsyn-comment">#-&gt; @"a"</span>
(<span class="mdzsyn-coresym">set</span> (<span