In some cases, we know they exist because of the headers containing them. Others are just a case of @available being a better fit.
Pull request: https://github.com/WebKit/WebKit/pull/10628
<rdar://problem/106194046>
Committed 266235@main (b5e4644abe94): <https://commits.webkit.org/266235@main> Reviewed commits have been landed. Closing PR #14559 and removing active labels.