map -is:exact -package:basement -package:base -is:exact -package:ghc -package:filepath -package:bytestring -package:aeson is:exact -package:invertible -package:foldl -package:charset package:hedgehog

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.