map is:exact -package:base -package:bytestring -package:base-compat -package:imports -package:blaze-html -package:charset -package:containers -package:conduit 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.