Persistant (as in on disk) data

[mike V]

>The nhc98 compiler already accepts a `deriving Binary' clause.
>DrIFT likewise already supports {-! derives : Binary !-}.  I imagine
>it wouldn't be too difficult to use GHC's support for Generics to code
>up a simple deriving mechanism as well.

What was the strategy employed to derive instances of sum types, i.e. the 
binary representation?


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