0.3.3
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* Remove redundant constraints
* Build warning-free on GHC 8.0-rc1

0.3.2.1
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* Haddock fix

0.3.2
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* Build without warnings on GHC 7.10
* Overload Foldable `null` and `length` on GHC 7.10+

0.3.1
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* Explicit nominal role annotation

0.3.0.1
-------
* Nicer formatting of the haddocks