RESOLVED FIXED313941
Reduce use of uncheckedDowncast for JS types in WebCore/ 
https://bugs.webkit.org/show_bug.cgi?id=313941
Summary Reduce use of uncheckedDowncast for JS types in WebCore/
Chris Dumez
Reported 2026-05-03 17:24:11 PDT
Reduce use of uncheckedDowncast for JS types in WebCore/. Use safer downcast & dynamicDowncast instead. This tested as performance neutral on Speedometer 3.
Attachments
Add attachment proposed patch, testcase, etc.
Chris Dumez
Comment 1 2026-05-03 17:33:40 PDT
Pull request: https://github.com/WebKit/WebKit/pull/64136
EWS
Comment 2 2026-05-03 23:12:27 PDT
Committed 312505@main (952b3b16274d): <https://commits.webkit.org/312505@main> Reviewed commits have been landed. Closing PR #64136 and removing active labels.
Radar WebKit Bug Importer
Comment 3 2026-05-03 23:13:13 PDT
<rdar://problem/176158958>
EWS
Comment 4 2026-05-06 02:57:46 PDT
Committed 305413.838@safari-7624-branch (bce21b2cf3d3): <https://commits.webkit.org/305413.838@safari-7624-branch> Reviewed commits have been landed. Closing PR #5177 and removing active labels.
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