5.2.7 [2025.06.17]

• Make the implementations of (.>) and (*>) for Data.Functor.Yoneda more stack-efficient.

5.2.6 [2024.05.04]

• Drop support for GHC 8.2 and earlier.

• Generalize instances in Control.Monad.Codensity to be of the form:

  instance (f ~~ f', MonadFail f') => MonadFail (Codensity (f :: k -> TYPE rep))
  

  This avoids having to constrain k ~ Type and rep ~ LiftedRep, which could potentially harm type inference.

• Explicitly implement liftA2 in the Applicative instance for Data.Functor.Day.Curried.

• Add an Adjunction instance for Data.Functor.Day.

• Add Adjunction and Divisible instances for Data.Functor.Contravariant.Day.

• Add an Apply instance for Data.Functor.Day.Curried.

5.2.5 [2022.06.26]

• Only require a Functor constraint in the Eq and Ord instances for Coyoneda when building against transformers-0.4.*.

5.2.4 [2022.05.07]

• Allow building with transformers-0.6.* and mtl-2.3.*.

5.2.3 [2021.07.27]

• Add shift and reset to Control.Monad.Codensity.

5.2.2 [2021.02.17]

• Add hoistCoyoneda to Data.Functor.Contravariant.Coyoneda.

5.2.1 [2020.10.01]

• Allow building with GHC 9.0.

5.2 [2018.07.03]

• Make Codensity levity polymorphic.
• Add the Data.Functor.Invariant.Day module, which combines the covariant and contravariant versions of Day. As a result, kan-extensions now depends on the invariant package.
• Add a wrapCodensity function.
• More efficient Eq1, Ord1, and Adjunction instances for Coyoneda.
• Add INLINE pragmas on more functions.
• Allow building with containers-0.6.

5.1 [2018.01.28]

• Make Density, Codensity, Kan and Lan polykinded.
• Add Eq1, Ord1, Read1 and Show1 instances for Coyoneda and Yoneda.
• Change contexts of Eq and Ord instances of Coyoneda and Yoneda (and the Show instance for Coyoneda) to require lifted class instances, e.g. Eq1 f, Eq a.
• Allow free-5.

5.0.2

• Added hoistCoyoneda

5.0.1

• Removed some redundant constraints

5

• Move Data.Functor.Kan.Rift to Data.Functor.Day.Curried

4.2.3

• Builds clean on GHC 7.10

4.2.2

• semigroupoids 5 support

4.2.1

• Add liftRift and lowerRift

4.2

• Remove pointed dependency

4.1.1

• Added Applicative instance for Day
• Added Typeable instance for Codensity

4.1.0.1

• Added tagged dependency

4.1

• Moved co- and contra- variant Day convolution from contravariant to here. Day convolution is intimately connected to Rift.

4.0.3

• Added liftCoT0M, liftCoT1M, diter and dctrlM for using CoT w m to model a state machine with states in w and effects in m.

4.0.2

• Made fixes necessary to work around changes in ImpredicativeTypes for GHC 7.8.1rc2

4.0.1

• Bug fix so we can compile on GHC 7.4

4.0

• Removed keys dependency
• Now compatible with adjunctions 4.0

3.7

• Moved all the Yoneda variants around again.
• Improved haddocks

3.6.2

• Added Data.Functor.Contravariant.Yoneda to complete the set of Yoneda embeddings/reductions.

3.6.1

• Added several missing isomorphisms

3.6

• instance Monad m => MonadSpec (Yoneda m)

3.5.1

• Fixed a bug in the signature for composedRepToCodensity.

3.5

• More combinators for Rift/Lift.
• Added combinators for working with representable functors rather than just adjoint functors.
• Split Data.Functor.KanExtension into Data.Functor.Kan.Ran and Data.Functor.Kan.Lan
• Split Data.Functor.KanLift into Data.Functor.Kan.Rift and Data.Functor.Kan.Lift
• Moved from Data.Functor.Yoneda.Contravariant to Data.Functor.Yoneda.Reduction adopting terminology from Todd Trimble.
• Added various missing isomorphisms.
• Greatly improved the Haddocks for this package stating laws and derivations where we can (especially for ‘Rift’ and ‘Ran’).

3.3

• Rift is now Applicative. Added rap.

3.2

• Added right and left Kan lifts under Data.Functor.KanLift.
• Decreased reliance on the Composition class where unnecessary in the API

3.1.2

• Marked modules Trustworthy as required for SafeHaskell in the presence of these extensions.

3.1.1

• Refactored build system
• IRC build-bot notification
• Removed upper bounds on dependencies on my other packages

3.1

• Moved Control.Monad.Free.Church over to the free package instead and removed it from kan-extensions