Unrelated to TurboFan. RegExp builtins are written in CSA (https://github.com/v8/v8/wiki/CodeStubAssembler-Builtins …) and don't go through the optimizing pipeline.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.