public static <T> Builder<T> newBuilder(int initialCapacity) {
        return new Builder<>(initialCapacity);
    }
@Test
    public void serialization_whenInInitialLoadingAndEmpty() throws Exception {
        InflatableSet<Object> set = InflatableSet.newBuilder(0).build();
        InflatableSet<Object> clone = TestJavaSerializationUtils.serializeAndDeserialize(set);
        assertEquals(set, clone);
    }