code: protected void initializeData(ULocale desiredLocale, String type)
      {
          String key = desiredLocale.getBaseName() + '+' + type;
          String ns = desiredLocale.getKeywordValue("numbers");
          if (ns != null && ns.length() > 0) {
              key += '+' + ns;
          }
          DateFormatSymbols dfs = DFSCACHE.getInstance(key, desiredLocale);
          initializeData(dfs);
      }
docs: We may need to deescalate this API to @internal.