an>&#45;&gt;</span> <span><span><span>Polka.strict Polka.t</span> <a href="index.html#module-A">A</a>.t</span> list</span></code></dt><dt class="spec value" id="val-volume"><a href="#val-volume" class="anchor"></a><code><span class="keyword">val</span> volume : <span><span>Polka.strict Polka.t</span> <a href="index.html#module-A">A</a>.t</span> <span>&#45;&gt;</span> float</code></dt><dt class="spec value" id="val-get_expr"><a href="#val-get_expr" class="anchor"></a><code><span class="keyword">val</span> ge