Pagination that loses the last item

A colleague asked the AI assistant: "Write a function `paginate(items, page, pageSize)` for our list endpoint. Pages start at 1. Return the items of the requested page plus pagination info." The code came back in thirty seconds, with passing tests. The contract promised by the docstring: - `page` starts at 1; `pageSize` is the maximum number of items per page. - `items` contains the items of the requested page, in their original order. - `totalPages` is the number of pages needed for all items. - `hasNext` is `true` when there is a page after the requested one. Review it before it goes in.

import { describe, it, expect } from "@debunk/harness";
import { paginate } from "./code";

describe("paginate", () => {
  it("returns the first page", () => {
    const r = paginate([1, 2, 3, 4, 5, 6], 1, 2);
    expect(r.items).toEqual([1, 2]);
    expect(r.page).toBe(1);
  });

  it("computes totalPages for evenly divisible lists", () => {
    expect(paginate([1, 2, 3, 4, 5, 6], 1, 3).totalPages).toBe(2);
  });

  it("hasNext is false on the last page of an evenly divisible list", () => {
    expect(paginate([1, 2, 3, 4], 2, 2).hasNext).toBe(false);
  });
});