s.</p></dd>


</dl></dd>


<dt id="arg--messages">.messages<a class="anchor" aria-label="anchor" href="#arg--messages"></a></dt>
<dd><p>a set of glue specs. The glue code can use any global
variable, grouping variable, {.new_cols} or {.dropped_cols} for changes to
columns, {.cols} for the output column names, or {.strata}. Defaults to nothing.</p></dd>


<dt id="arg--headline">.headline<a class="anchor" aria-label="anchor" href="#arg--headline"></a></dt>
<dd><p>a headline glue spec. The glue code can use an