I don't agree with that contrived definition of delivery. As a developer, what I care about is delivery of the message to my function/handler. E.g. so that I ca

I don't agree with that contrived definition of delivery. As a developer, what I care about is delivery of the message to my function/handler. E.g. so that I can store it in my local database/store on the receiver side exactly once and ultimately show it to the user exactly once. Definitely possible.