Neither is 'non negative' - but that should also be a built-in, considering how verbose the language becomes otherwise.

Now you're adding ~5 lines of boilerplate every time you want to have an integer, another 5 for positive integers, and so on.

To support non-negative integers, all you need is the following

{"type": "integer", "minimum": 0}

I think the format used in the example was used to demonstrate bundling, but if what you really want is a non-negative integer, the above is the simplest way to do it.

This is correct.

If I had used a more complex example, it would have been much harder to follow. This was the simplest.

We factor this out for our meta-schema construction due to reuse.