The problem with software is that generally a single bit wrong is a total failure. This doesn't mesh with my experience to be honest. I often come across code

The problem with software is that generally a single bit wrong is a total failure. This doesn't mesh with my experience to be honest. I often come across code that contains nasty bugs but is still somehow working accidentally. And even more often, there are bugs that stop just one feature from working while the rest of a large system pretty much acts as if the bug didn't exist.