{
  "nested state": (() => {
    // No shipped primitive's realm encoding nests, so this one stands in: its
    // state holds an array with a buffer inside it, and an object with another
    // object inside that.
    class Nested extends FabricPrimitive {
      static get [REALM_CODEC]() {
        return {
          tagForValue: () => "Nested@1",
          encode: () => ({
            list: [1, new Uint8Array([1, 2]).buffer, [true]],
            inner: { b: new ArrayBuffer(0), deeper: { n: 3n } },
          }),
        };
      }
    }
    return new Nested();
  })(),
}

--

nested state:
/Nested(list:[1,buf[0102],[true]],inner:{b:buf[],deeper:{n:3n}})
/Nested(
  list: [
    1,
    buf [0102],
    [
      true
    ]
  ],
  inner: {
    b: buf [],
    deeper: {
      n: 3n
    }
  }
)
/Nested(
  list: [
    1,
    buf [0102],
    [
      true
    ]
  ],
  inner: {
    b: buf [],
    deeper: {
      n: 3n
    }
  }
)