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I think we can improve Membuster via this change (based on the tracked data).
Created attachment 387753 [details] Patch
Created attachment 387754 [details] Patch
Created attachment 387763 [details] Patch
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Created attachment 387856 [details] Patch
Comment on attachment 387856 [details] Patch r=me
Committed r254708: <https://trac.webkit.org/changeset/254708>
<rdar://problem/58657110>
This broke an API test, tracking in https://bugs.webkit.org/show_bug.cgi?id=206432