 may cause confusion with its use by the <code>is_*_form()</code> functions until they are upgraded in the next version.</p>
<p>These new variables complement the already-computed but heretofore undocumented variables <code>stratum</code> and <code>deposit</code>. <code>stratum</code> obviates the need for the <code>infer.label</code> parameter, which is deprecated. Its alias, <code>label.strata</code>, is now defunct. (The variable <code>alluvium</code> is often computed, but it is manipulated to be used b