code: public PBConfig config() {
      if (this.config != null)
        return this.config;
      Configuration pbConfig = this.f.configurationFor(ConfigurationType.PB_ENCODER);
      return pbConfig != null ? (PBConfig) pbConfig : this.defaultConfig;
    }
docs: Returns the current configuration of this encoder.  If the encoder was constructed with a given configuration, this
  configuration will always be used.  Otherwise the current configuration of the formula factory is used or - if not
  present - the default configuration.
  @return the current configuration of