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