?? is called a "coalesce expression", so ??= should be "coalesce equal"
Created attachment 396780 [details] Patch
Comment on attachment 396780 [details] Patch Thanks!
Committed r260275: <https://trac.webkit.org/changeset/260275> All reviewed patches have been landed. Closing bug and clearing flags on attachment 396780 [details].
<rdar://problem/61946522>