Quote: a concrete type or value type is like an 'int'; it does one thing well and efficiently without inheritance; e.g., 'date'

Quotation Skeleton

We call such simple user-defined types [such as 'date'] concrete types to distinguish them from abstract types … and to emphasize their similarity to build-in types … Their model of use and the 'philosophy' behind … of a concrete type is to do a … If you do not like some detail of … 're-use' a concrete type you use it in …   Google-1   Google-2

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