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Courier-powered Delivery. That's a lot of big words to mean "someone other than Samuel M will pick this up."

Is that what it means? I read it as "the courier will walk or use a bike" eg. not a car. Not that I see how that would be relevant for the reciept either.


Immutable data structures are often implemented as persistant data structures, which have the traits of immutability but does not "copy everything on every change" https://en.wikipedia.org/wiki/Persistent_data_structure


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