code: @Deprecated
      public Transliterator safeClone() {
          UnicodeFilter filter = getFilter();
          if (filter != null && filter instanceof UnicodeSet) {
              filter = new UnicodeSet((UnicodeSet)filter);
          }
          return new RuleBasedTransliterator(getID(), data, filter);
      }
docs: Temporary hack for registry problem. Needs to be replaced by better architecture.
  @deprecated This API is ICU internal only.
  @hide draft / provisional / internal are hidden on Android