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aeson v1.4.0.0 Release Notes

  • 🚀 This release introduces bounds on the size of Scientific numbers when they are converted to other arbitrary precision types that do not represent them efficiently in memory.

    📜 This means that trying to decode a number such as 1e1000000000 into an Integer will now fail instead of using a lot of memory. If you need to represent large numbers you can add a newtype (preferably over Scientific) and providing a parser using withScientific.

    The following instances are affected by this:

    • FromJSON Natural
    • FromJSONKey Natural
    • FromJSON Integer
    • FromJSONKey Integer
    • FromJSON NominalDiffTime

    🚚 For the same reasons the following instances & functions have been removed:

    • ✂ Remove FromJSON Data.Attoparsec.Number instance. Note that Data.Attoparsec.Number is deprecated.
    • ✂ Remove deprecated withNumber, use withScientific instead.

    Finally, encoding integral values with large exponents now uses scientific notation, this saves space for large numbers.