map -package:containers -package:imports -package:base -package:bytestring -package:Cabal-syntax -package:charset -package:case-insensitive -package:basement -package:psqueues package:hedgehog 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.