No, sorry. That post was kind of two things rolled into one. The example was about comparing NaN with ordinary numbers, not with itself. In the example, both

No, sorry. That post was kind of two things rolled into one. The example was about comparing NaN with ordinary numbers, not with itself. In the example, both "num_examples <= 0" and "0 < num_examples" evaluate to false, which is mathematically correct but leaves the function in an inconsistent state.