Is it possible to annotate my schema with descriptions?

[agladysh]

Something like...

const $ = scope({
  param: {
    answer: 'number /// Any numeric value accepted. Try 42.',
  }
}).export();

...would be nice to have (with any syntax) — I'd like to make the diagnostics more readable for my users, yet I'd like to keep the documentation in the same spot as the schema itself in the code.