fix: append large parser collections safely

tests/append.test.ts

@@ -0,0 +1,21 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+// SPDX-License-Identifier: MPL-2.0
+
+import { describe, expect, it } from 'vitest';
+
+import { appendItems } from '../src/onenote/model/append.js';
+
+describe('bounded collection append', () => {
+  it('does not use a variadic call for argument-limit-sized collections', () => {
+    const source = Array.from({ length: 200_000 }, (_, index) => index);
+    const target = [-1];
+
+    appendItems(target, source);
+
+    expect(target).toHaveLength(200_001);
+    expect(target[0]).toBe(-1);
+    expect(target.at(-1)).toBe(199_999);
+  });
+});