No one seems to mention this but a lot of the time the code in the binary might not be the same code you see in your IDE so the line number doesn’t match. Intellij for example decompiles libraries when you open them and you have to press a button to download the actual source with all the comments and everything

Worked at a machine shop for a while, it’s funny how the easiest way to gauge surface finish is to run your nail trough it

At one of the places we worked at we would know when the rough cut was deep enough just by feel