f="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"ignore"</span>, <span class="st">"inform"</span>, <span class="st">"warn"</span>, <span class="st">"abort"</span><span class="op">)</span>,</span>
<span>  na_keys <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"ignore"</span>, <span class="st">"inform"</span>, <span class="st">"warn"</spa