equalsAttributeValue method
Parses value and returns true if is equals to this instance value.
Implementation
@override
bool equalsAttributeValue(Object? value) {
  if (value == null) return !hasAttributeValue;
  if (!hasAttributeValue) return false;
  var valuesList = parseListOfStrings(value, delimiterPattern);
  return isEqualsList(_values, valuesList);
}