encode<V>  static method 
Implementation
static V encode<V>(
  InvoiceLineItemPeriod instance,
  Encoder<V> encoder,
) {
  final container = encoder.container<String>();
  container.encodeDateTime(
    'end',
    instance.end,
  );
  container.encodeDateTime(
    'start',
    instance.start,
  );
  return container.value;
}