Adopt Identifier::fromString(ASCIILiteral) more broadly, now that it is very efficient.
Created attachment 456181 [details] WIP Patch Will A/B test to avoid surprises.
Created attachment 456186 [details] WIP Patch
Created attachment 456233 [details] Patch
Committed r292193 (249096@main): <https://commits.webkit.org/249096@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 456233 [details].
<rdar://problem/91138736>