map -package:Cabal -package:base -package:case-insensitive -package:bytestring -package:blaze-html -package:unordered-containers -package:containers package:hedgehog -is:exact is:exact

Generates a map using a Range to determine the length. This may fail to generate anything if the keys produced by the generator do not account for a large enough number of unique items to satify the required map size.