pipes-4.1.3

• Added fold' and foldM'
• Added void to re-exports
• Increased lower bounds on mtl

pipes-4.1.2

• Improve efficiency of (*>)

pipes-4.1.1

• transformers-0.4.* support
• Added MMonad instance for Proxy

pipes-4.1.0

• Removed void dependency
• Added drain
• Removed CPP extension
• Support for Haskell98 subset of pipes temporarily disabled
• Added mini-tutorial to Pipes.Lift

pipes-4.0.2

• Sped up each by improving build/foldr fusion
• Added new appendix to tutorial describing quadratic time complexity of Control.Monad.replicateM and friends

pipes-4.0.1

• Added several new rewrite rules which will improve efficiency of user code
• Added a QuickCheck test suite
• Added manual proofs of category theory laws as laws.md
• Pipes.Lift now has distribute which lets you easily write your own runXXXP functions
• You can now compile a Haskell98 subset of pipes using cabal install -f haskell98 pipes
• Added mtl instances for ListT
• Added fail for ListT
• Added Monoid instance for ListT
• Fixed implementation of pass (for MonadWriter instance of Proxy)
• Added mapFoldable to Pipes.Prelude

pipes-4.0.0

• No more proxy transformers and no more p type parameter. Instead of a type class you have a concrete Proxy type. This also means no more runIdentityP.
• The default API is a simpler unidirectional subset of the original API (which means no more () arguments).
• The module hierarchy has been moved under Pipes
• The API and module hierarchy is much smaller (~ 1/3 the original size), mostly as a consequence of the previous two changes.
• Prelude functions have simpler names but are no longer exported by default
• New polymorphic type synonyms to simplify type signatures.