# ChangeLog / ReleaseNotes


## Version 0.2.0.1

* API documentation ehancements and clarifications.
* Explicit implementation of `aDualEndo` for
  `instance AnEndo a => AnEndo (Maybe a)`.
* Uploaded to [Hackage][]: <http://hackage.haskell.org/package/endo-0.2.0.1>


## Version 0.2.0.0

* Default implementation for `anEndo` method of 'AnEndo' type class, which is
  now defined as: `anEndo = getDual . aDualEndo`. As a consequence it is now
  possible to define complete instances of `AnEndo` by providing either
  `anEndo` or `aDualEndo`. (new, change)
* Introducing associated type `Result` to `FoldEndoArgs` type class. This
  allows result of the whole folding to be explicitly stated in a type
  signature. (new, change)
* Introducing functions `embedEndoWith` and `embedDualEndoWith`. Both can be
  used to simplify application of endomorphisms that are result of folding.
  (new)
    - `embedEndoWith :: (AnEndo e, EndoOperatesOn e ~ a) => (Endo a -> b) -> e
      -> b`
    - `embedDualEndoWith :: (AnEndo e, EndoOperatesOn e ~ a) => (Dual (Endo a)
      -> b) -> e -> b`
* Introducing `instance AnEndo (Proxy a)`, which is useful in cases when one
  needs to force constraint `EndoOperatesOn args ~ a` where `a` is the `a` from
  `Proxy a`. This is done by encoding value of `Proxy` in to identity
  endomorphism that operates on specified type `a`. (new)
* Introducing `instance (Monoid c, FoldEndoArgs r) => FoldEndoArgs (Const c
  r)`, which is useful in cases when one needs to discard the computation and
  return a constant instead. (new)
* Bumping upper bounds on base and between, therefore it now builds on GHC 7.10
  with base 4.8. (new)
* Uploaded to [Hackage][]: <http://hackage.haskell.org/package/endo-0.2.0.0>


## Version 0.1.0.2

* Bugfix release.
* Bugfix: Unable to compile with transformers >= 0.4 (again).
* Minor documentation updates.
* Uploaded to [Hackage][]: <http://hackage.haskell.org/package/endo-0.1.0.2>


## Version 0.1.0.1

* Bugfix release.
* Bugfix: Unable to compile with transformers >= 0.4.
* Uploaded to [Hackage][]: <http://hackage.haskell.org/package/endo-0.1.0.1>


## Version 0.1.0.0

* **This version doesn't work with transformers >= 0.4.**
* First public release.
* Uploaded to [Hackage][]: <http://hackage.haskell.org/package/endo-0.1.0.0>



[Hackage]:
  http://hackage.haskell.org/
  "HackageDB (or just Hackage) is a collection of releases of Haskell packages."

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