docs: private void writeBadManifestEntry(PrintWriter writer, File f, BadFeature bf) {
          writer.write(f.getAbsolutePath()); // 0
          writer.write(FeatureDefinitionUtils.SPLIT_CHAR);
          writer.write(String.valueOf(bf.lastModified)); // 1
          writer.write(FeatureDefinitionUtils.SPLIT_CHAR);
          writer.write(String.valueOf(bf.length)); // 2
      }