} else {
      @Nullable
      Object[] uniqueElements =
          shouldTrim(uniques, elements.length) ? Arrays.copyOf(elements, uniques) : elements;
      return new RegularImmutableSet<E>(uniqueElements, hashCode, table, mask, uniques);
    }
  }

  private static boolean shouldTrim(int actualUnique, int expectedUnique) {
    return actualUnique < (expectedUnique >> 1) + (expectedUnique >> 2);
  }