RESOLVED FIXED300364
Use uncheckedDowncast<>() in generated toJSNewlyCreated() functions 
https://bugs.webkit.org/show_bug.cgi?id=300364
Summary Use uncheckedDowncast<>() in generated toJSNewlyCreated() functions
Chris Dumez
Reported 2025-10-07 19:48:29 PDT
Use uncheckedDowncast<>() in generated toJSNewlyCreated() functions instead of downcast<>(), since the code does a `is<>()` check right before and we want to guarantee the compiler doesn't generate the type check twice.
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Add attachment proposed patch, testcase, etc.
Chris Dumez
Comment 1 2025-10-07 19:49:41 PDT
Pull request: https://github.com/WebKit/WebKit/pull/51983
EWS
Comment 2 2025-10-07 22:19:29 PDT
Committed 301186@main (287f8c8f6baf): <https://commits.webkit.org/301186@main> Reviewed commits have been landed. Closing PR #51983 and removing active labels.
Radar WebKit Bug Importer
Comment 3 2025-10-07 22:20:14 PDT
<rdar://problem/162173250>
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