Rollup property response does not match type

[rhinodavid]

I have a Rollup property in a database that points to a Number property with the "Show original" calculate strategy.

The relevant portion of the Page response follows:

  "Chain ID": {
      "id": "ej%40%3A",
      "type": "rollup",
      "rollup": {
          "type": "array",
          "array": [
              {
                  "type": "number",
                  "number": 42161
              }
          ],
          "function": "show_original"
      }
  }

In api-endpoints.d.ts, as of v2.2.8 the relevant portion of PageObjectResponse is:

{
        type: "rollup";
        rollup: {
            type: "number";
            number: number | null;
            function: RollupFunction;
        } | {
            type: "date";
            date: DateResponse | null;
            function: RollupFunction;
        } | {
            type: "array";
            array: Array<{
                type: "title";
                title: Array<RichTextItemResponse>;
            } | {
                type: "rich_text";
                rich_text: Array<RichTextItemResponse>;
            } | {
                type: "people";
                people: Array<PartialUserObjectResponse | UserObjectResponse>;
            } | {
                type: "relation";
                relation: Array<{
                    id: string;
                }>;
            }>;
            function: RollupFunction;
        };
        id: string;
    }

As you can see, the "array" property doesn't have a union member where type: "number".

Am I missing something here?