code: public boolean begin(Class<?> docletClass,
              Iterable<String> options,
              Iterable<? extends JavaFileObject> fileObjects) {
          this.docletClass = docletClass;
          List<String> opts = new ArrayList<>();
          for (String opt: options)
              opts.add(opt);
  
          return begin(opts, fileObjects).isOK();
      }
docs: Called by 199 API.