Section Names

I believe this code in basic.theme is incorrect...

  $alias = str_replace('/', '-', $alias);
  if (!empty($alias)) {
    $variables['attributes']['class'][] = 'page-' . $alias;
     list($section,) = explode('/', $alias, 2);
     if (!empty($section)) {
        $variables['attributes']['class'][] = 'section-' . $section;
     }
  }

$alias as been updated $alias = str_replace('/', '-', $alias); to have slashes replaced by dashes, 'before' the check for sections list($section,) = explode('/', $alias, 2);