Certified PRO developer move: if you want to encode a set in JSON, use a map with arbitrary values: { "a": "please", "b": "don't", "d": "actually", "c": "do", "e": "this" }
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A set of booleans can only be {true} {false} {true, false} so 3 possible values. You can encode that as a single nullable boolean!
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gah, I'm tired. For the empty set, you just never return a response.
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in that case, a pair of two booleans will encode all 4 options. Classy and concise!
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