Google testing a hundred results per page

While doing keyword research for a client, I spotted a longer than usual set of results. REALLY longer. So I counted them. 100 organic results for “vinyl fencing”. Redid the search, back to the usual 10. Here’s the screenshot of the page compressed as much as I could…so at least you can see I’m not lying 🙂 100 results on page 1?

Followup: my initial query URL was: clicking on the “2” (page) link at the bottom took me to this URL (note the num= and the startat= parameters):