t;<a class="type" title="Bool - The standard Boolean type, which can either be true or false." href="../../Bool.html">Bool</a>&gt;</code></h3><div class="doc"><p></p></div></div><div class="field "><a name="metaKey"></a><h3 class="anchor"><code><span class="label label-meta label-meta-optional" title="Marks the field of a structure as optional.">@:optional</span><span class="label label-optional">optional</span><a href="#metaKey"><span class="identifier">metaKey</span></a>:<a class="type" title="Null - Null