They're too hard to keep up to date since a dynamic change to any object could affect any arbitrary descendant. We can instead resolve these on-demand.
<rdar://problem/103675565>
Created attachment 464186 [details] Patch
Created attachment 464189 [details] Patch
Created attachment 464197 [details] Patch
Committed 258327@main (af7823b64640): <https://commits.webkit.org/258327@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 464197 [details].