code class="sourceCode r">drop</code> eliminates all classes and attributes,
returning a regular R object:</p>
<div class="sourceCode" id="cb6"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="fu"><a href="../reference/drop_undeclare.html">undeclare</a></span><span class="op">(</span><span class="va">x2</span>, drop <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span>
<span><span class="co">#&gt; [1]   1   2   3   4   5 -91 -91</span></span><