map is:exact -package:unordered-containers -package:base-compat -package:blaze-html -package:charset -package:containers -package:foldl -package:aeson -package:bytestring 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.