0.6.1

• Added tryReadMVar for read-only MVars.

0.6

• Write-only types are no longer Eq, but are now contravariant functors.

0.5

• Read-only types are no longer Eq, but are now functors.

0.4

• Functions are low lifted to MonadBase IO.

0.3

• Initial version with read-only and write-only versions of Chan, MVar, TChan, TMVar and TVar.