msgpack/msgpack-haskell — pull request #30 by TomMD (2012-11-29 21:03:42+00:00)
Title: Remove Upper Bounds

Template-haskell, bytestring, and vector all have newer versions that
work fine, but users of these newer versions have headaches when trying
to use msgpack. This is a great example of why upper-bounds do more
harm than good.