ode><span><span class="keyword">val</span> equal_fast : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> bool</span></code></div><div class="spec-doc"><p><code>equal_fast x y</code> must imply <code>x &lt;=&gt; y</code>; it's a good idea for this function to be &quot;fast&quot;, e.g. not depend on the size of its input</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-is_normal"><a