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I don't think those are happening, but how about basic set arithmetic? The fact that you can't do difference / union / intersection using the standard library is frustrating.

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There's a proposal for that.

Two of them now. One to add Set-specific methods, and another to port the usual Array.prototype methods over to Set and Maps. Can't wait!

https://github.com/tc39/set-methods https://github.com/tc39/collection-methods

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