-91) NA(-91)</span></span>
<span><span class="co">#&gt; Missing values: -91, -92</span></span>
<span><span class="co">#&gt; Missing range:  [-95, -91]</span></span>
<span><span class="co">#&gt;</span></span>
<span><span class="co">#&gt; Labels:</span></span>
<span><span class="co">#&gt;  value   label</span></span>
<span><span class="co">#&gt;    -91 Missing</span></span></code></pre></div>
<p>The missing values are properly formatted, even inside the base data
frame:</p>
<div class="sourceCode" id="cb8"><p