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Is V8 unable to remove this because of old, poorly-written websites?

Can it maybe shut off if it detects strict mode or something? Seems wild to find this behavior in Node and evergreen browsers.

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It's part of the language spec.

Right. My question was to ask what it would take to remove it. Backwards compatibility is a concern, but could strict mode or some other flag be used to mark it as disabled?

Having it in there optionally would be even more awkward, and getting rid of it entirely isn't possible without changing the JavaScript spec /shrug

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