issue discovered in French Bistrot: https://fr.wikipedia.org/w/index.php?title=Wikip%C3%A9dia:Le_Bistro/30_janvier_2017#bizarreries
French wikipedia page named ''Désiré Dihau has pageviews before it has been created !
- pageviews: https://tools.wmflabs.org/pageviews/?project=fr.wikipedia.org&platform=all-access&agent=user&range=latest-20&pages=D%C3%A9sir%C3%A9_Dihau
- page history: https://fr.wikipedia.org/w/index.php?title=D%C3%A9sir%C3%A9_Dihau&action=history
First quick research on 1 hour shows that pages counted as pageviews for this specific case before page creation are using POST on URL `fr.wikipedia.org,/w/index.php,?title=D%C3%A9sir%C3%A9_Dihau&action=submit`, and are having the same exact url referer.
Smalltalking with @Trizek-WMF (who showed me the case), we came to conclusion that this case is probably due to hitting `preview` when modifying a page.
This should be confirmed and discuss as to whether or not it should be counted as pageview.