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The io-streams library contains simple and easy to use primitives for I/O
using streams. Based on simple types with one type parameter (`InputStream a`
and `OutputStream a`), io-streams provides a basic interface to
side-effecting input and output in `IO` monad with the following
features:
* three fundamental I/O primitives that anyone can understand: `read ::
InputStream a -> IO (Maybe a)`, `unRead :: a -> InputStream a -> IO ()`,
and `write :: Maybe a -> OutputStream a -> IO ()`.
* simple types and side-effecting IO operations mean straightforward and
simple exception handling and resource cleanup using standard Haskell
facilities like `bracket`.
* code to transform files, handles, and sockets to streams
* a variety of combinators for wrapping and transforming streams, including
compression and decompression using zlib, controlling precisely how many
bytes are read to or written from a socket, buffering output using
`blaze-builder`, etc.
* support for parsing from streams using `attoparsec`.
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