0.1.1

• Address consent (privacy): a checkbox consent is given for what the type authorized (the cart:
  ck_notification_address_consent.grant_reference_id), and unticking withdraws only that one. Before, unticking
  withdrew every consent of the number for the type and website - a guest who typed someone else's number could end
  that person's consent and sign-ups. A consent from before 0.1.1 (no cart on it) is withdrawn by unticking from the
  same IP; a STOP, a stop link or the stop list still ends all of a number's consents. A sign-up rests on its own
  cart's consent (or one from before 0.1.1), never on another cart's.
• Email, an unknown outcome: Magento email treated every failure that was not an SMTP 4xx as "not sent", so the
  email was sent again - also when the connection to the mail server ended after the whole email went out and before
  the server's reply (it may have taken it): a possible duplicate. That case is now a MessageSentException (not
  sent again; Symfony Mailer: by its SMTP transcript, Laminas Mail: a reply that never came). A refusal, no
  connection, a failed login or a failure before the email ended is still sent again. "Never twice" means a rare loss
  on that ambiguity, never a duplicate (docs/how-it-works.md).