So it's easier to guarantee the identity is correct? That doesn't stop you from using the incorrect identity, though. I'm not quite sure I understand how this

So it's easier to guarantee the identity is correct? That doesn't stop you from using the incorrect identity, though. I'm not quite sure I understand how this is better than a define - if you know enough to know whether you're using the correct value, it can just as easily be a define? I think I can see the idea, but I'm probably not paranoid enough to understand how it's helpful XD