{
  "with a non-enumerable property": (() => {
    // A non-enumerable property is left out of the rendering entirely.
    const v = { shown: 1 };
    Object.defineProperty(v, "hidden", { value: 2, enumerable: false });
    return v;
  })(),
}

--

with a non-enumerable property:
{shown:1}
{
  shown: 1
}
{
  shown: 1
}