Popular wikis widget – based on number of views or comments?

The usage doco says that the Popular Wikis widget is based on the number of views.

However, I’ve checked the code in libclassesPopularWikisWidget.php and see this:

$wiki_posts = get_posts(
'post_parent' => 0,
'post_type' => 'incsub_wiki',
'orderby' => 'comment_count',
'order' => 'DESC',
'numberposts' => 100000

Looks like it’s being ordered by the number of comments. Am I missing something here?

How do we get this to be ordered by the number of views as described?