docs: public static void assertEquals(String message, Object expected,
              Object actual) {
          if (equalsRegardingNull(expected, actual)) {
              return;
          }
          if (expected instanceof String && actual instanceof String) {
              String cleanMessage = message == null ? "" : message;
              throw new ComparisonFailure(cleanMessage, (String) expected,
                      (String) actual);
          } else {
              failNotEquals(message, expected, actual);
          }
      }