My (would be) manager who was also technical (he has since self demoted to an IC role after his kids graduated college) was already satisfied. It was one of the other devs who was sitting in.

I think he asked me something about the difference between undefined and implementation defined behavior and the an example of each. This was in 2015. I had the same question when it was relevant for an interview in 1999.

I’ve geeked out with another hiring manager at an interview about some old 8 bit coding I did but that felt different.