assertEquals("Date should match", original, deserialized);
    }

    /**
     * Test serialization of LinkedHashMap (preserves order)
     */
    @Test
    public void test_serializeDeserialize_linkedHashMap() {
        LinkedHashMap<String, Object> original = new LinkedHashMap<>();
        original.put("first", 1);
        original.put("second", 2);
        original.put("third", 3);