Mak RegistrableDomain() private constructor take the String as an rvalue reference. Most call sites have an rvalue reference and it reduces ref counting churn this way.
Created attachment 422306 [details] Patch
Committed r273944: <https://commits.webkit.org/r273944> All reviewed patches have been landed. Closing bug and clearing flags on attachment 422306 [details].
<rdar://problem/75075378>