It’s a good observation, and the slug(slug(x)) = slug(x) property means that if you have an x and you’re not sure it’s a slug, it’s always ok to slug it to be s

It’s a good observation, and the slug(slug(x)) = slug(x) property means that if you have an x and you’re not sure it’s a slug, it’s always ok to slug it to be sure it is. This property can be really handy in building robust systems, where you might have to attempt a couple of times to complete an operation for sure.