[
  {
    "a": "a",
    "foo": {
      "bar": {
        "$numberDouble": "1.1"
      },
      "baz": {
        "qux": "1.2.1",
        "quux": "1.2.1"
      }
    },
    "z": "1.2.2",
    "notes": "z"
  }
]