Sometimes I forget to log in. Or, more recently, a chronic and seemingly intractable session bug in MediaWiki drops my user ID during an edit and, even though I did log in, Wikipedia forgets and signs with my IP, and I don't notice. My IP address used to be pretty static and nobody else seemed to use it so up until 3 May 2019 83.104.46.71 (talk· contribs) was in effect an unintentional alias. On 3 May 2019 I changed my phone connection and ISP, and my IP address now appears to be dynamic. Sorry about that, folks.