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 🙂

Followup: my initial query URL was:

https://www.google.com/search?q=vinyl+fencing&oq=vinyl+fencing&aqs=chrome..69i57j0l5.2687j0j7&sourceid=chrome&es_sm=93&ie=UTF-8&changed_loc=1

clicking on the "2" (page) link at the bottom took me to this URL (note the num= and the startat= parameters):

https://www.google.com/search?q=vinyl+fencing&num=100&es_sm=93&ei=wBmFU4_iF4qJogTEyYHAAw&start=100&sa=N&biw=1422&bih=1070&dpr=0.9