e-t">t</a> list</span> <span>&#45;&gt;</span> <span><a href="index.html#type-t">t</a> option</span></code></dt><dt class="spec value" id="val-spawn"><a href="#val-spawn" class="anchor"></a><code><span class="keyword">val</span> spawn : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> float</code></dt><dt class="spec value" id="val-filter_neg"><a href="#val-filter_neg" class="anchor"></a><code><span class="keyword">val</span> filter_neg : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a hr