Symfony user providers: the secret shortcut revealed

I started a summer season series on Twitter https://twitter.com/marenkay/status/1006286995767877634 (now to be found with #summersymfony) on common pet peeves and quirks one encounters when working on Symfony projects.

The series will go on for at least a month and take apart small stuff from real world projects.

I'd be happy to get some feedback and/or suggestions!