RFC: Nested record definitions

I’m a little bit skeptic about using the @as attribute for renaming the underline types.

Because currently it exists to adjust the runtime representation of ReScript data and simply putting the @as to a wrong place will result in a completely different result:

type options = {
  startFrom: float,
  @as("persistOptions") persist?: { // makes the type `type persistOptions` instead of `type \"options.persist\"
    fileName: string,
    path?: string,
    fileConfig?: {
      extension?: string
    }
  }
}

I’d like to keep @as only for changing the runtime representation.