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some
This library defines several versions of an existential type 'Some', which works like this datastructure:
data Some f where
Some :: f a > Some f
and operations to work with it.
However, due to GHC issue #1965, the direct implementation of this datastructure is less efficient than it could be. As a result, this library uses a more complex approach that implements it as a newtype, so there's no runtime overhead associated with wrapping and unwrapping Some
values.
To use the recommended implementation, import Data.Some
. If you need to ensure that you are definitely using the newtype implementation, import Data.Some.Newtype
. By default, these are the same, but this can be changed via a Cabal flag.