When both if<Foo> + downcast<Foo> are used, dynamicDowncast() is preferred (less repetitive).
Pull request: https://github.com/WebKit/WebKit/pull/4482
Committed 254644@main (cfb088fd5663): <https://commits.webkit.org/254644@main> Reviewed commits have been landed. Closing PR #4482 and removing active labels.
<rdar://problem/100138658>
Well, this is part of the work done for LBSE, but doesn't "block" bug 90738, removing that dependency again.