ah, javascript: "to do a simple set subtraction, convert one of the sets into an array, do an item-by-item check against the other, and re-assemble a new set from the results!"

it's like writing C, but slower.

why would it have killed you to add basic set operations to the set type?

or, to put it another way, what is the point of adding a set type if it's missing the basic set operations?

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