The package summary is "Type-safe ADT-database mapping library.", which gives some idea about what it does.<br><br>In my experience, any package that starts its source files with<br>
<br>
<pre><span class="hs-comment">    {-# LANGUAGE GADTs, TypeFamilies, ExistentialQuantification, StandaloneDeriving, TypeSynonymInstances, MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances, FlexibleContexts, OverlappingInstances, ScopedTypeVariables, GeneralizedNewtypeDeriving, UndecidableInstances, EmptyDataDecls #-}</span><br></pre><br>is probably an experiment in what is possible, rather than a production-friendly library.<br><br>Many people upload experimental packages to Hackage so that they can be used by other interested people, even though the packages are not ready/intended for mass consumption. A lack of documentation in such cases is understandable.<br><br>I wonder if it would be worth giving package uploaders control over whether their packages are shown on the package list? Packages can be manually hidden by emailing an admin, but that's a lot of trouble.<br>