The example is not a poka yoke. A poka yoke is an implement that prevents or calls attention to an error state. It's shaping objects so that they can only be i

The example is not a poka yoke. A poka yoke is an implement that prevents or calls attention to an error state. It's shaping objects so that they can only be inserted a certain way, it's a flexible barrier that bumps against tall vehicles before they hit the tunnel entrance. An enum is not that, I think.