pec value" id="val-isnull"><a href="#val-isnull" class="anchor"></a><code><span class="keyword">val</span> isnull : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-isone"><a href="#val-isone" class="anchor"></a><code><span class="keyword">val</span> isone : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-iszero"><a href="#val-iszero" class="anchor"></a><code><span class="keyword">val</span> iszero