A simple general purpose shared state cache map with automatic expiration
 of values, for caching the results of accessing a resource such as reading
 a file. With variations for Ord and Hashable keys using "Data.Map.Strict"
 and "Data.HashMap.Strict", respectively.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.