class ExtraFieldPropagation implements Propagation<K> {

  @Deprecated public static void set(String name, String value) {
    BaggageField field = BaggageField.getByName(validateFieldName(name));
    if (field == null) return;
    field.updateValue(value);
  }

    ExtraFieldPropagation(Propagation<K> delegate, List<K> extraKeys);

}