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aeson v1.4.4.0 Release Notes

Release Date: 2019-06-25 // almost 5 years ago

  • 🆕 New features:

    • ➕ Adds a parameterized parser jsonWith that can be used to choose how to handle duplicate keys in objects, thanks to Xia Li-Yao.

    • ➕ Add generic implementations of FromJSONKey and ToJSONKey, thanks to Xia Li-Yao. Example:

    data Foo = Bar
  deriving Generic

opts :: JSONKeyOptions
opts = defaultJSONKeyOptions { keyModifier = toLower }

instance ToJSONKey Foo where
  toJSONKey = genericToJSONKey opts

instance FromJSONKey Foo where
  fromJSONKey = genericFromJSONKey opts

    Minor:

    • aeson now uses time-compat instead of time-locale-compat, thanks to Oleg Grenrus.
    • Prepare for MonadFail breakages in GHC 8.8, thanks to Oleg Grenrus.
    • 🏗 Require bytestring >= 0.10.8.1 for newer GHCs to avoid build failures, thanks to Oleg Grenrus.
    • 👌 Support primitive 0.7.*, thanks to Adam Bergmark.
    • Allow semigroups 0.19.* and hashable 1.3.*, thanks to Oleg Grenrus.
    • 🛠 Fix a typo in the error message when parsing NonEmpty, thanks to Colin Woodbury.
    • Document surprising behavior when using omitNothingFields with type variables, thanks to Xia Li-Yao.

    Internal changes:

    • Code cleanup by Oleg Grenrus
    • 🛠 Fix dependencies of the benchmarks on older GHC's, thanks to Xia Li-Yao.