Normalize `readonly`

[mikedamay]

We could normalize away readonly and const for exercises that do not have const/readonly as a prerequisite.

Is it worth the effort/possible maintenance headache?

For this sort of thing maybe it's easier to live with a few more representations?

[ErikSchierboom]

Is it worth the effort/possible maintenance headache?

Good question. We could maybe make it a contextual optimization, in that we only apply it to some specific exercises. I do like the suggestion to normalize it.