These values were something I was experimenting with as a way of knowing "has this ever been changed", but as it turned out there were other ways of achieving this and/or it was unnecessary to do so.
Created attachment 423906 [details] Patch
Created attachment 423907 [details] Patch
Committed r274807: <https://commits.webkit.org/r274807> All reviewed patches have been landed. Closing bug and clearing flags on attachment 423907 [details].
<rdar://problem/75710752>