As well as followup "builtins: Speculative MSVC fix." This reverts commits 5b1db59fb87b4146f827d17396f54ef30ae0dc40 and f1c4df5b7bb79efb3e9be7fa5f8176506499d0a6. Needs fixes for failing tests which will take time to implement.
musttail
48 bX