[
  {
    "foo": {
      "$numberInt": "1"
    }
  },
  {
    "foo": {
      "$numberInt": "1"
    },
    "bar": {
      "$numberInt": "2"
    }
  },
  {
    "foo": {
      "$numberInt": "1"
    },
    "bar": {
      "$numberInt": "2"
    },
    "baz": {
      "$numberInt": "3"
    }
  },
  {
    "baz": {
      "$numberInt": "3"
    }
  },
  {},
  {
    "bar": {
      "$numberInt": "2"
    }
  },
  {
    "baz": {
      "$numberInt": "3"
    }
  },
  {
    "bar": {
      "$numberInt": "2"
    }
  },
  {
    "foo": {
      "$numberInt": "1"
    },
    "bar": {
      "$numberInt": "2"
    },
    "baz": {
      "$numberInt": "3"
    }
  }
]