to_constant_opt : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span><a href="index.html#type-coeff">coeff</a> option</span></code></dt><dt class="spec value" id="val-is_linear"><a href="#val-is_linear" class="anchor"></a><code><span class="keyword">val</span> is_linear : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-clean"><a href="#val-clean" class="anchor"></a><code><span class="keyword">val</span> clean : <a href="index.html#type-t">t