It's always enabled.
Created attachment 450339 [details] Patch
Comment on attachment 450339 [details] Patch I'm pretty sure the test failure in streams/readable-stream-lock-after-worker-terminates-crash.html is nothing to do with this patch.
Committed r288797 (246574@main): <https://commits.webkit.org/246574@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 450339 [details].
<rdar://problem/88233233>