The ConcurrentEffect/Par construct for running the data retrieval routines.
version of the library, Fetch had one type parameter - specifying the type of thing
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Have a general mechanism for dot-notation accessible associated types
It means that a module fully manages its data, i.e. any data that the module owns and operates can be altered only by the module’s code itself. If there’s a need to manipulate the data from outside, it’s done only via the module’s public API. It guarantees that there are no unauthorized changes to the data that come from other modules (i.e. a distant, unrelated code, which is not tested together). Encapsulation is also used to maintain invariants.