ass="anchor"></a><code><span><span class="keyword">mutable</span> verbosity : bool;</span></code></li></ol><code><span>}</span></code></div><div class="spec-doc"><p>Type definition of parameter.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-default"><a href="#val-default" class="anchor"></a><code><span><span class="keyword">val</span> default : <span>unit <span class="arrow">&#45;&gt;</span></span> <a href="#type-typ">typ</a></span></code></div><div class="spec-doc"><p>Creat