String processedEmpty = emptyResult.map(s -> s.toLowerCase()).orElse("default");

        assertEquals("default", processedEmpty);
    }

    @Test
    public void test_ofNullable_performanceAndMemory() {
        // Test creating many OptionalEntity instances
        for (int i = 0; i < 1000; i++) {
            OptionalEntity<Integer> opt = OptionalUtil.ofNullable(i);
            assertTrue(opt.isPresent());