It's actually a big problem and anything but common sense. Do all C programmers know what strict aliasing means? How about pointer provenance? Have they memo

It's actually a big problem and anything but common sense. Do all C programmers know what strict aliasing means? How about pointer provenance? Have they memorized integer promotion rules? These are all potential sources of undefined behavior that can lead to catastrophic results. I bet most experienced C programmers with decades under their belt would fail one or more of these tests.