dangerouslyGetChildren(rootID: string = DEFAULT_ROOT_ID) {
      const container = rootContainers.get(rootID);
      return getChildren(container);
    }
Prefer using `getChildrenAsJSX`.
Using the returned children in `.toEqual` has very poor performance on mismatch due to deep equality checking of fiber structures.
Make sure you deeply remove enumerable properties before passing it to `.toEqual`, or, better, use `getChildrenAsJSX` or `toMatchRenderedOutput`.