The issue kept recurring and was incredibly hard to test for because you can't write a test for some logic which doesn't exist yet: you can't test something is correct until you've written it and if you forgot to sent the changed event you can forget to write a test that checks you didn't forget it...

After reading the weekly updates for quite some time but never participating on the forums, this post finally made me create a forums account. From the point of a Factorio developer, I would say that it makes me proud and insecure at the same time in particular made me want to express my respect for...