Define a custom hash() method for use with ES6 maps

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Is something like this possible?

No, this is a known flaw of ES6 Collections. All they do is check for reference identity, and there is no way to change that.

The best thing you can do (if hash consing the instances is not an option as you say) is not to use objects for the keys. Instead, use strings that encode the Key values, and convert back and forth between the two representations. Given that you consider your keys to be immutable, this should not pose a problem.

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