}

  /**
   * Returns a wrapper of {@code reference} that implements {@link Wrapper#equals(Object)
   * Object.equals()} such that {@code wrap(a).equals(wrap(b))} if and only if {@code equivalent(a,
   * b)}.
   *
   * <p>The returned object is serializable if both this {@code Equivalence} and {@code reference}
   * are serializable (including when {@code reference} is null).
   *
   * @since 10.0
   */