Sorry for the double send, Henning. I forgot the list.
An ZipList-like Applicative instance for Data.Map would be nice. I have an application where I like to write
liftA3 f amap bmap cmap
meaning
Map.intersectionWith ($) (Map.intersectionWith f amap bmap) cmap
But I cannot complete the instance implementation because there is no sensible definition for 'pure' for Data.Map. :-(
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