"><span class="fu">declared</span>()</code>, <code class="sourceCode r"><span class="fu">as.declared</span>()</code>, <code class="sourceCode r"><span class="fu">undeclare</span>()</code> and
<code class="sourceCode r"><span class="fu">drop_na</span>()</code> are
all generic, allowing full flexibility for any other packages to create
custom (coercion) methods for different object classes, thus
facilitating and encouraging a widespread use.</p>
  </main>
</div>



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