map -package:containers -package:charset -package:invertible -package:monoidal-containers -is:exact -package:base-compat -package:case-insensitive -package:foldl -package:bytestring -package:dlist package:aeson is:exact

map :: (a -> b) -> KeyMap a -> KeyMap b
aeson Data.Aeson.KeyMap
Map a function over all values in the map.