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A comment on V8 Release 5.1.

Re:V8 Release 5.1 by amelius on Saturday April 23, 2016 @05:51PM (#11557576)
Did they run speed benchmarks against older versions of V8?

I'm wondering about the performance cost of these new features (hopefully zero).

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Re:V8 Release 5.1 by chr1 on Sunday April 24, 2016 @08:51AM (#11559511)
Unfortunately it is much larger than zero see https://groups.google.com/d/msg/strengthen-js/ojj3TDxbHpQ/T6....

It is very sad that people working on es spec do not care enough about performance

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Re:V8 Release 5.1 by hashseed on Friday April 29, 2016 @11:55PM (#11600269)
Yup. To some, performance is just an implementation detail, and they keep adding hooks like @@hasInstance.
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