mes-expand"></a></dt>
<dd><p>Should the values in the <code>names_from</code> columns be expanded
by <code><a href="https://tidyr.tidyverse.org/reference/expand.html" class="external-link">expand()</a></code> before pivoting? This results in more columns, the output
will contain column names corresponding to a complete expansion of all
possible values in <code>names_from</code>. Implicit factor levels that aren't
represented in the data will become explicit. Additionally, the column
names will be sorted, id