{
  // An object with more properties than the limit renders the first that
  // many, in key order, and then its actual property count in place of the
  // rest. The limit applies wherever properties are laid out: a plain
  // object, a class instance's own properties, a primitive's realm state,
  // and an instance's contents.
  "/options": { maxProperties: 2 },

  "past the limit": { a: 1, b: 2, c: 3, d: 4 },

  "at the limit": { a: 1, b: 2 },

  "below the limit": { a: 1 },

  "in an object": { o: { a: 1, b: 2, c: 3 } },

  "in an array": [{ a: 1, b: 2, c: 3 }],

  "class instance": new (class Data {
    a = 1;
    b = 2;
    c = 3;
  })(),

  "primitive's realm state": new (class Wide extends FabricPrimitive {
    static get [REALM_CODEC]() {
      return {
        tagForValue: () => "Wide@1",
        encode: () => ({ p: 1, q: 2, r: 3 }),
      };
    }
  })(),

  "instance's contents": new FabricLink({ id: "of:fid1:abc", a: 1, b: 2 }),

  // A key of `/...` is escaped, and so is told apart from the count form.
  "with a `/...` key": { "/...": 1, b: 2, c: 3 },
}

--

past the limit:
{a:1,b:2,...count:4}
{
  a: 1,
  b: 2,
  ... count: 4
}
{
  a: 1,
  b: 2,
  "/...": {
    count: 4
  }
}

at the limit:
{a:1,b:2}
{
  a: 1,
  b: 2
}
{
  a: 1,
  b: 2
}

below the limit:
{a:1}
{
  a: 1
}
{
  a: 1
}

in an object:
{o:{a:1,b:2,...count:3}}
{
  o: {
    a: 1,
    b: 2,
    ... count: 3
  }
}
{
  o: {
    a: 1,
    b: 2,
    "/...": {
      count: 3
    }
  }
}

in an array:
[{a:1,b:2,...count:3}]
[
  {
    a: 1,
    b: 2,
    ... count: 3
  }
]
[
  {
    a: 1,
    b: 2,
    "/...": {
      count: 3
    }
  }
]

class instance:
/Data(a:1,b:2,...count:3)
/Data(
  a: 1,
  b: 2,
  ... count: 3
)
{
  "/Data": {
    a: 1,
    b: 2,
    "/...": {
      count: 3
    }
  }
}

primitive's realm state:
/Wide(p:1,q:2,...count:3)
/Wide(
  p: 1,
  q: 2,
  ... count: 3
)
/Wide(
  p: 1,
  q: 2,
  r: 3
)

instance's contents:
/Link(id:"of:fid1:abc",a:1,...count:3)
/Link(
  id: "of:fid1:abc",
  a: 1,
  ... count: 3
)
{
  "/Link@1": {
    id: "of:fid1:abc",
    a: 1,
    "/...": {
      count: 3
    }
  }
}

with a `/...` key:
{"/...":1,b:2,...count:3}
{
  "/...": 1,
  b: 2,
  ... count: 3
}
{
  "//...": 1,
  b: 2,
  "/...": {
    count: 3
  }
}