What does JSON.stringify produce for this object?

const data = {
  name: "Ada",
  age: undefined,
  greet() {
    return "hi";
  },
  score: NaN,
  tags: [undefined, () => {}, Infinity],
  ids: new Set([1, 2]),
  joined: {
    toJSON() {
      return "2024-01-01";
    },
  },
};
 
console.log(JSON.stringify(data));
console.log(JSON.stringify(undefined), JSON.stringify([undefined]));