{
  "with symbol keys": {
    // A symbol-keyed property, interned or unique, is left out of the rendering
    // entirely. Only the string-keyed properties show.
    shown: 1,
    [Symbol.for("interned")]: 2,
    [Symbol("unique")]: 3,
    alsoShown: 4,
  },
}

--

with symbol keys:
{shown:1,alsoShown:4}
{
  shown: 1,
  alsoShown: 4
}
{
  shown: 1,
  alsoShown: 4
}