https://github.com/Lysxia/generic-random/blob/master/changelog.md

1.3.0.0

• Add ConstrGen (custom generators for fields specified by constructor name and index).
• Stop requiring custom generators lists to be terminated by :+ (), or to be lists at all.
• Breaking minor change: when a record field has a different type than a FieldGen custom generator for the same field name, this is now a compilation error. This was simply ignored before.
• Miscellaneous documentation improvements in Generic.Random module.

1.2.0.0

• Fix a bug where generators did not decrease the size parameter with single-field constructors

• The sized generators now use a custom generator for lists. Use genericArbitraryRecG () to disable that. See tutorial for more information.

• Lists of custom generators are now constructed using (:+) instead of GenList

• Rename Field to FieldGen

• Add Gen1, Gen1_ (custom generators for unary type constructors)

• Add listOf', listOf1', vectorOf'

• Remove deprecated module Generic.Random.Generic

1.1.0.2

• Improved performance

1.1.0.1

• Fix build for GHC<8

1.1.0.0

• Add option to specify custom generators for certain fields, overriding Arbitrary instances
  • Add genericArbitraryG, genericArbitraryUG, genericArbitrarySingleG, genericArbitraryRecG
• Add GArbitrary and GUniformWeight synonyms
• Deprecate Generic.Random.Generic
• Remove weights from the external API

1.0.0.0

• Make the main module Generic.Random
• Rework generic base case generation
  • You can explicitly provide a trivial generator (e.g., returning a nullary constructor) using withBaseCase
  • Generically derive BaseCaseSearch and let BaseCase find small values, no depth parameter must be specified anymore
• Add genericArbitrarySingle, genericArbitraryRec, genericArbitraryU'
• Deprecate weights
• Fixed bug with genericArbitrary' not dividing the size parameter

0.5.0.0

• Turn off dependency on boltzmann-samplers by default
• Add genericArbitraryU, genericArbitraryU0 and genericArbitraryU1
• Compatible with GHC 7.8.4 and GHC 7.10.3

0.4.1.0

• Move Boltzmann sampler modules to another package: boltzmann-samplers

0.4.0.0

• Check well-formedness of constructor distributions at compile time.
• No longer support GHC 7.10.3 (the above feature relies on Generic information which does not exist before GHC 8)

0.3.0.0

• Support GHC 7.10.3
• Replace TypeApplications with ad-hoc data types in genericArbitraryFrequency'/genericArbitrary'