code: RbnfLenientScanner getLenientScanner() {
          if (lenientParse) {
              RbnfLenientScannerProvider provider = getLenientScannerProvider();
              if (provider != null) {
                  return provider.get(locale, lenientParseRules);
              }
          }
          return null;
      }
docs: Returns the scanner to use for lenient parsing.  The scanner is
  provided by the provider.
  @return The collator to use for lenient parsing, or null if lenient parsing
  is turned off.