> The bane of mutation testing is equivalent mutants: mutations that aren't actually bugs, because they leave the program correct. That's one reason I check th

> The bane of mutation testing is equivalent mutants: mutations that aren't actually bugs, because they leave the program correct. That's one reason I check the hash of the optimized binaries-- often the compiler manages to convert different but equivalent code into the same binary. It's still not enough, but it's an easy filter to apply with no false exclusions.