In visual studio, a program for software developers, one of the type of templates you can start up and make a program with is in "blazor webassembly". One of Microsoft's fancy new things.
In there, right after starting it, there is some example code thrown in your face. Code that contains pi... with a rounding error.
So I, being the insistent autistic nerd I am, made a pull request and had it fixed. And I still wonder how so many people looked at that and it bothered absolutely no one enough to go and fix it.