an class="keyword">mutable</span> state : <a href="#type-state">state</a>;</span></code></li><li id="type-attr.shape" class="def record field anchored"><a href="#type-attr.shape" class="anchor"></a><code><span><span class="keyword">mutable</span> shape : <span><span><span>int array</span> option</span> array</span>;</span></code></li><li id="type-attr.value" class="def record field anchored"><a href="#type-attr.value" class="anchor"></a><code><span><span class="keyword">mutable</span> value : <span><a href=