class Net::IMAP::AppendUIDData

def initialize(uidvalidity:, assigned_uids:)
  uidvalidity   = Integer(uidvalidity)
  assigned_uids = SequenceSet[assigned_uids]
  NumValidator.ensure_nz_number(uidvalidity)
  if assigned_uids.include_star?
    raise DataFormatError, "uid-set cannot contain '*'"
  end
  super
end