Earlier quoted context omitted.
Sounds kind of silly, just run the thing till it gives the right answer ? How do you know each pass has not introduced a new problem ?
Yup. …and if it works (and it does) then it really goes to show that you (and me, and people in general) have poor intuition about this stuff.
It's a silly, potentially dangerous and inefficient way to "code", which is the easiest part of my job. If my job was just coding all day, I'd be happy.