map -package:containers -package:base-prelude -package:foldl -package:blaze-html -package:invertible -package:charset -package:bytestring -package:filepath -package:imports 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.