ghc-reflection

This package addresses the "configuration problem" which is propagating configurations that are available at run-time, allowing multiple configurations to coexist without resorting to mutable global variables or 'System.IO.Unsafe.unsafePerformIO'. That package is an implementation of the ideas presented in the paper "Functional Pearl: Implicit Configurations" by Oleg Kiselyov and Chung-chieh Shan (<http://okmij.org/ftp/Haskell/tr-15-04.pdf original paper>). However, the API has been streamlined to improve performance. Austin Seipp's tutorial <https://www.schoolofhaskell.com/user/thoughtpolice/using-reflection Reflecting values to types and back> provides a summary of the approach taken by this library, along with more motivating examples.

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