formatted due to switching <strong>roxygen</strong> syntax to markdown.</p>
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<h3 id="z-ordering-patch-0-9-1">z-ordering patch<a class="anchor" aria-label="anchor" href="#z-ordering-patch-0-9-1"></a></h3>
<p>The internal z-ordering function <code>z_order_aes</code> failed to recognize contiguous segments of alluvia, thereby assigning later segments missing values of <code>'group'</code> and preventing them from being rendered. This has been corrected.</p>
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