Richard A. Eisenberg Simon Peyton Jones

Along with the unboxed primitive types (such as Int # and Double #), Haskell has support for unboxed tuples. A normal, boxed tuple—of type, say, (Int;Bool)—is represented by a heap-allocated vector of pointers to the elements of the tuple. Accordingly, all elements of a boxed tuple must also be boxed. Boxed tuples are also lazy, ................
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