getUseNative method
Return true if this formatter uses native digits to format the number
Implementation
bool getUseNative() {
String result = '';
final String formatOptions = toJsonString();
final String jscode1 = 'new NumFmt($formatOptions).getUseNative()';
result = ILibJS.instance.evaluate(jscode1).stringResult;
return result.toLowerCase() == 'true';
}