;</span> <span><span>Polka.strict Polka.t</span> <a href="index.html#module-A">A</a>.t</span></code></dt><dt class="spec value" id="val-is_empty"><a href="#val-is_empty" class="anchor"></a><code><span class="keyword">val</span> is_empty : <span><span>Polka.strict Polka.t</span> <a href="index.html#module-A">A</a>.t</span> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-join"><a href="#val-join" class="anchor"></a><code><span class="keyword">val</span> join : <span><span>Polka.strict Po