map is:exact -package:vector -package:ghc -package:basement -package:charset -package:case-insensitive -package:filepath -package:conduit -package:foldl -package:invertible -package:psqueues 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.