map -package:vector -package:basement -package:conduit -package:imports -package:incipit-base -package:filepath -package:invertible -package:monoidal-containers -package:aeson 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.