code: private String description() {
          return String.format(Locale.ENGLISH, "%s[%s%s%s %s %s]",
              Replicator.class.getSimpleName(),
              isPull(config.getReplicatorType()) ? "<" : "",
              config.isContinuous() ? "*" : "-",
              isPush(config.getReplicatorType()) ? ">" : "",
              config.getDatabase(),
              config.getTarget());
      }
docs: - (NSString*) description