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typeof NaN "number" 9999999999999999 10000000000000000 0.50.10.6 true ? 0.10.20.3 false ? Math.max() -Infinity Math.min () Infinity " ? "object Object" truetruetrue3 true true-true 0 true1 true true1 false (!!).length 9 9"1" ( "91" 91-"1" 90 0 true Thanks for inventing Javascript