* <p>Historically, {@code Equivalence} instances in this library have implemented this method to
   * recognize certain cases where distinct {@code Equivalence} instances would in fact behave
   * identically. However, as code migrates to {@code java.util.function}, that behavior will
   * disappear. It is best not to depend on it.
   */
  @Override
  public boolean equals(@Nullable Object object) {
    return super.equals(object);
  }

                    logger.debug("Delete {}", dir);
                }
                return true;
            }
            return false;
        }

    }

    /**
     * Migrates existing thumbnail files to the new directory structure.
     */
    public void migrate() {
        new Thread(() -> {
            final Path basePath = baseDir.toPath();