 value" id="val-description"><a href="#val-description" class="anchor"></a><code><span class="keyword">let</span> description: <a href="index.html#type-t">t</a> <span>=&gt;</span> option(string);</code></dt><dd><p>description is an arbitrary string that usually provides guidelines on when this priority class should be used.</p></dd></dl><dl><dt class="spec value" id="val-global_default"><a href="#val-global_default" class="anchor"></a><code><span class="keyword">let</span> global_default: <a href="index.htm