docs: def CopyVcardFields(new_vcard, auth_vcard, field_names):
      """Copy vCard field values from an authoritative vCard into a new one."""
      for field in field_names:
          value_list = auth_vcard.contents.get(field)
          new_vcard = SetVcardField(new_vcard, field, value_list)
      return new_vcard