libghc-unordered-containers-dev - 0.2.19.1-2+b1 main

It contains efficient hashing-based container types. The containers
have been optimized for performance critical use, both in terms of
large data quantities and high speed.
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The declared cost of each operation is either worst-case or
amortized, but remains valid even if structures are shared.
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This package provides a library for the Haskell programming language.
See http://www.haskell.org/ for more information on Haskell.