Data.Scientific provides a space efficient and arbitrary precision scientific number type. Scientific numbers are represented using scientific notation. It uses a coefficient c :: Integer and a base-10 exponent e :: Int (do note that since we're using an Int to represent the exponent these numbers aren't truly arbitrary precision). A scientific number corresponds to the Fractional number: fromInteger c * 10 ^^ e. The main application of Scientific is to be used as the target of parsing arbitrary precision numbers coming from an untrusted source.
WWW: https://github.com/basvandijk/scientific
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