code: protected String defaultConfiguration() {
          final StringBuilder bldr = new StringBuilder();
  
          for (final Entry<String, String> entry : defaults().entrySet()) {
              final String name = entry.getKey();
              final String value = entry.getValue();
              bldr.append(name);
              bldr.append(" ");
              bldr.append(NAME_VALUE_DELIMITER);
              bldr.append(" ");
              bldr.append(value);
              bldr.append("\n");
          }
  
          return bldr.toString();
      }
docs: Returns the default configuration provided by {@link #defaults()}.
  
  @return Non-null string