It's all good, we're talking past each other slightly. Thanks for the clarification on non-determinism. I think you're giving sensible advice for the world as i

It's all good, we're talking past each other slightly. Thanks for the clarification on non-determinism. I think you're giving sensible advice for the world as it is, I'm speculating as to what the world should be. Minor changes in compiler version and input source leading to widely varying output is a definite hazard. Especially when people change their code to make it run faster, or change the compiler to make some code run faster. That's one with no clear good solution.