fier">clone</span></a> (<span style="white-space:nowrap">byRef:<span class="type">Bool</span> = true,</span> <span style="white-space:nowrap">?copier:<span class="type">T</span>&nbsp;&#8209;&gt;&nbsp;<span class="type">T</span></span>):<a class="type" title="" href="../../polygonal/ds/Collection.html">Collection</a>&lt;<span class="type">T</span>&gt;</code></h3><div class="doc"><p>Creates and returns a shallow copy (structure only - default) or deep copy (structure &amp; elements) of this two-dimensional ar