serializeToMap method

Map serializeToMap ()

Implementation 

Map serializeToMap() {
  // Don't write default ZERODIGIT, conserves space, but also minimize file
  // churn.
  var basicMap = _serializeToMap();
  if (ZERODIGIT != null && ZERODIGIT != '') {
    basicMap["ZERODIGIT"] = ZERODIGIT;
  }
  return basicMap;
}