Version 3.1.2.0
* Added `-f devel` for test cases that are known to fail.
[#471](https://github.com/haskell/network/pull/471)
* Improved precedence-compliant Read/Show instances. Verified via QuickCheck.
[#465](https://github.com/haskell/network/pull/465)
[#466](https://github.com/haskell/network/pull/466)
* Removed the racing graceful close implementation to avoid issues with `CLOSE_WAIT`.
[#460](https://github.com/haskell/network/pull/438)
* Gracefully handle binding of UNIX domain sockets.
[#460](https://github.com/haskell/network/pull/460)
* Replace Socket type and family with extensible `CInt` pattern and synonyms.
[#459](https://github.com/haskell/network/pull/459)
* Fixed race conditions in tests.
[#458](https://github.com/haskell/network/pull/458)
* Removed many legacy uses of `undefined`.
[#456](https://github.com/haskell/network/pull/456)
* Defined extensible `CustomSockOpt` via `ViewPatterns`.
[#455](https://github.com/haskell/network/pull/455)
* Defined `openSocket` in terms of `AddrInfo`.
[5b0987197fe2ed7beddd7b2096522d624e71151e](https://github.com/haskell/network/commit/5b0987197fe2ed7beddd7b2096522d624e71151e)
* Improved FreeBSD portability for Control Messages and tests
[#452](https://github.com/haskell/network/pull/452)
* Support `sendMsg` and `recvMsg`
[#433](https://github.com/haskell/network/pull/433)
[#445](https://github.com/haskell/network/pull/445)
[#451](https://github.com/haskell/network/pull/451)
* Added `sendMsg` and `recvMsg` APIs
* Redefined `SocketOption` as pattern synonym
* Implement total Show functions for SockAddr
[#441](https://github.com/haskell/network/pull/441)
* Improve portability changing `u_int32_t` to `uint32_t`.
[#442](https://github.com/haskell/network/pull/442)
* Removed obsolete CPP statements.
[d1f4ee60ce6a4a85abb79532f64d4a4e71e2b1ce](https://github.com/haskell/network/commit/d1f4ee60ce6a4a85abb79532f64d4a4e71e2b1ce)
* Loads of improved test coverage.
[cbd67cc50a37770432eb978ac8b8eb6da3664817](https://github.com/haskell/network/commit/cbd67cc50a37770432eb978ac8b8eb6da3664817)
[fcc2d86d53a6bec793f6a979a9e8fdf7fe3f4c22](https://github.com/haskell/network/commit/fcc2d86d53a6bec793f6a979a9e8fdf7fe3f4c22)
[6db96969b3e8974abbfd50a7f073baa57376fd5e](https://github.com/haskell/network/commit/6db96969b3e8974abbfd50a7f073baa57376fd5e)