* <p>All other properties of the transformed map, such as iteration order, are left intact. For
   * example, the code:
   *
   * <pre>{@code
   * NavigableMap<String, Boolean> options = Maps.newTreeMap();
   * options.put("verbose", false);
   * options.put("sort", true);
   * EntryTransformer<String, Boolean, String> flagPrefixer =
   *     new EntryTransformer<String, Boolean, String>() {