map is:exact -package:text -package:containers -package:basement -package:foldl -package:monoidal-containers -package:base-compat -package:pipes -package:invertible -package:charset 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.