code: private void addIntervalFallback(MethodSpec.Builder method, String pattern) {
      method.addComment("$S", pattern);
      for (Node node : WRAPPER_PARSER.parseWrapper(pattern)) {
        if (node instanceof Text) {
          method.addStatement("b.append($S)", ((Text)node).text());
  
        } else if (node instanceof Field) {
          Field field = (Field)node;
          String which = "s";
          if (field.ch() == '1') {
            which = "e";
          }
          method.addStatement("formatSkeleton(k, $L, b)", which);
        }
      }
    }
docs: Adds code to render the fallback pattern.