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I was perusing the shared extractor the other day, when I came across the `NodeInfo` struct. I noticed that the `fields` and `subtypes` fields on this struct had two seemingly identical ways of expressing the same thing: `None` and `Some(empty)` (where `empty` is respectively the empty map and the empty vector). As far as I can tell, there's no semantic difference in either case, so we can just elide the option type entirely and use the empty value directly. This has the nice side-effect of cleaning up some of the other code.