TBA

• Add Field typeclass, instances, and functions.
• Add Euclidean and GcdDomain instances for (), CDouble, CFloat, and Complex.
• Add Ring and Bits instances for WrappedFractional and WrappedIntegral.
• Add fromInteger and fromIntegral functions for Ring.

0.4.2: [2019.06.06]

• Add GcdDomain and Euclidean typeclasses.
• Add Mod2, the integers modulo 2, along with its Semiring/Ring/Star instances.

0.4.1: [2019.05.04]

• Remove unlawful and useless Ring instance for GHC.Natural.Natural.
• Correct behaviour/docs of Data.Semiring.(^)

0.4: [2019.05.01]

• Remove unlawful instances of Ring (thanks to @Bodigrim for noticing these)
• Add fromNatural to Semiring typeclass (thanks @Bodigrim)
• Remove Semiring/Ring instances for [] and Vector. (thanks @Bodigrim) These instances are better served by a dedicated polynomial package, which @Bodigrim has made at http://hackage.haskell.org/package/poly.
• Add isZero/isOne predicates.

0.3.1.2: [2019.04.02]

• Fix build error on windows caused by providing instances to POSIX types. Thanks to @Bodigrim and @CarlEdman for reporting this.

0.3.1.1: [2019.01.12]

• Fix build error caused by disabling building with containers.

0.3.1.0: [2019.01.12]

• Add Data.Semiring.Tropical
• Fix build problem on GHC 7.4 caused by introduction of IntSetOf/IntMapOf
• Make sure there are no warnings when building with -Wall, for any GHC

0.3.0.0: [2019.01.01]

• Rename the test suite to make stack happy.
• Clarified documentation. See #26.
• Simplify implementation of ^. See #24.
• Add 'GenericSemiring', a newtype wrapper meant to be used with -XDerivingVia, helping avoid '-XDefaultSignatures'.
• Add newtypes for IntSet and IntMap.
• Remove Semiring and Ring instances for Product and Sum.
• Make sum and product more efficient for base>=4.7

0.2.1.1: [2018.10.01]

• Fixed build on GHC-7.4
• Provide Semiring and Ring for an arbitrary Num via WrappedNum newtype.
• Make note of Semiring semantics for Vector and [] in the documentation.
• Require build script to ensure semirings builds with GHC-8.4.3 and GHC-8.6.1
• Fixed unlawful behaviour of [] Semiring instance.
• Improve performance of ^.

0.2.1.0: [2018.09.26]

• Removed use of DefaultSignatures
• Removed free semiring

0.2.0.1: [2018.07.28]

• Add instances for Op, Equivalence, Comparison, and Predicate from Data.Functor.Contravariant (upcoming base 4.12.0.0)
• docfix for (prod -> product, prod' -> product') change that occured in version 0.2.0.0.

0.2.0.0: [2018.07.23]

• Fixed the Semiring instances of Set, HashSet, Vector, Storable Vector, Unboxed Vector.
• Removed the Semiring instances of Seq, Alt, Endo.
• Added comprehensive test suite that tests all Semiring instances defined in Data.Semiring
• Added Free semiring (Data.Semiring.Free)
• Added newtypes: Add, Mul
• Bounds for containers: [0.3,0.6] -> [0.5.4,0.6.0.9]
• Add semiring instance for Proxy
• names changed: (prod -> product, prod' -> product')
• sum' and product' now use foldl' instead of foldr'

0.1.2: [2018.05.04]

• semirings now builds back to GHC-7.4.1.
• many doc fixes.

0.1.1: [2018.04.20]

• Remove unused coerce-util dependency.

0.1.0:

• Initial version.