Release notes for units

Version 2.4.1.5

• Use the (-) operator of the underlying Num instance in (|-|). This prevents crashes when the underlying number type does not support negation. (Issue #69)
• Compatibility with GHC 9.2.

Version 2.4.1.4

• Compatibility with GHC 9.0.

Version 2.4.1.3

• Compatibility with GHC 8.10, thanks to @ocharles.

Version 2.4.1.2

• Compatibility with singletons 2.6 and GHC 8.8, further thanks to @ocharles.

Version 2.4.1.1

• Fix some GHC compatibility issues, thanks to @ocharles.

Version 2.4.1

• Add Units superclass to UnitFactor, easing type inference in GHC 8.0, thanks to @rimmington.

Version 2.4

• New interface with the linear package in Data.Metrology.Linear.

• New Show and Read instances for dimensionless quantities.

• New NFData instances for quantities, thanks to @rimmington.

• GHC 8 compatibility.

Version 2.3

• Data.Metrology.TH.evalType now works in GHC 7.10 on dimensions like Volume instead of just base dimensions.

• Break out the units parser into its own package: units-parser.

• Add Data.Metrology.Unsafe.UnsafeQu, which has Functor and other instances.

• Fix the fixity of %. It was way too high! Now it's 5.

• Add the ability to convert in and out of point quantities. See quOfPoint and friends in Data.Metrology.Vector.

Version 2.2.1

• Compatibility with GHC 7.10.

• Added AdditiveGroup and VectorSpace instances for Qu.

Version 2.2

• Some types of arithmetic operations are different to aid in type inference. For example, *| does not normalize its dimension list.

• The types of the derive... TH functions now allow for deriving units based on composite dimensions/units.

• New TH function to help declare constants, called declareConstant.

Version 2.1

• Includes a decently comprehensive test suite.

• Add support for unit parsing within expressions:

  g = 9.8 % [si| m/s^2 |]
  

  See Data.Metrology.Parser.

• Now, Data.Metrology exports operators that work with the default LCSU. Use Data.Metrology.Poly to get the old, more flexible operators.

• Moved showIn from Data.Metrology.Show to Data.Metrology.Poly. This allows users to import showIn without a Show instance for quantities.

• Numeric operations are available based on vector spaces, as implemented in the vector-space library. See Data.Metrology.Vector.

• Some documentation cleanup.

• New function evalType that evaluates a type, using Template Haskell. This allows for easier instance declarations for quantities.

• New class Quantity that allows for easy conversions with non-units types.

• A few bugfixes.

• The Eq and Ord instances now work over any quantity, not just dimensionless ones.

• New functions in Data.Metrology.TH that define Dimension and Unit instances for you.

Version 2.0

This is a major update. units now supports the notion of a local unit set and of separable dimensions and units. See the description in the draft paper for more info.

This update will very likely break any code that used units-1.x.

The update was written in partnership with Takayuki Muranushi.

Version 1.1

• Added dependency on the singletons library

• Brought up to date with changes for GHC 7.8

• Generalized numerical representation

• Improved Haddock headers

Version 1.0.1

• Fixed dependency on base to force compilation with GHC >= 7.7

Version 1.0

• First release