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Is it even legal to have non-string keys in a JSON object? If they must be strings, and they must be unique, I don't think a key argument is necessary (and it would save the generation of the key array; not doing the work is faster than doing the work more efficiently after all), since the default tuple comparison would work fine; the first element would always be unequal, so the second elements would never be compared, right?
I'm not 100% on this with the rich comparison operator approach, but my attempts to trigger a failure haven't worked (TimSort or the tuple comparison, or both, are probably smarter about this than I am).