1.5 [2018.07.01]

• Support building with GHC 8.6, where Data.Functor.Contravariant has been moved into base.

1.4.1 [2018.01.18]

• Add Semigroup and Monoid instances for Predicate.
• Add lots of documentation explaining Contravariant, Divisible, and Decidable.
• Fix some dodgy CPP usage that caused the build to fail on Eta.

1.4

• Improved the performance of Deciding at the cost of downgrading it to Trustworthy.
• Support for GHC 8
• Support for transformers 0.5

1.3.3

• Add instance Monoid m => Divisible (Const m)

1.3.2

• Add ($<) operator

1.3.1.1

• Fixed builds on GHC 7.2

1.3.1

• Added Data.Functor.Contravariant.Generic on GHC 7.4+

1.3

• We’ve merged the foreign-var and StateVar packages. Transferring support to StateVar.

1.2.2.1

• Fixed redundant import warnings on GHC 7.10.

1.2.2

• Added foreign-var support.

1.2.1

• Added phantom to Data.Functor.Contravariant. This combinator was formerly called coerce in the lens package, but GHC 7.8 added a coerce method to base with a different meaning.
• Added an unsupported -f-semigroups build flag that disables support for the semigroups package.
• Minor documentation improvements.

1.2.0.1

• Fix build on GHC 7.0.4

1.2

• Renamed Data.Functor.Contravariant.Applicative to Data.Functor.Contravariant.Divisible

1.1.1

• Added Data.Functor.Contravariant.Applicative

1.0

• Removed Day convolution. The right adjoint of Day convolution is in kan-extensions as the right Kan lift. Moving these there to avoid forcing orphan instances. It also rather dramatically reduces the number of extensions required.
• This requires a first digit bump as it breaks several of my own packages.

0.6.1.1

• Fixed issue with needing KindSignatures on older GHCs

0.6.1

• Added covariant Day convolution. It isn’t contravariant, but it is inspired by the contravariant construction.

0.5.1

• transformers 0.4 compatibility

0.5

• Added (>$)
• Added instances for GHC.Generics

0.4.4

• Fixed compatibility with GHC 7.7 and tightened Safe Haskell support.

0.4.1

• Added Day convolution under Data.Functor.Contravariant.Day.

0.3

• Added Backwards and Reverse instances for transformers 0.3
• Added instance (Functor f, Contravariant g) => Contravariant (Compose f g). (This is non-canonical, but is necessary to support other packages.)
• Added Functor instances to ComposeFC and ComposeCF for use when modeling phantom type parameters caused mixing Functor + Contravariant.