Proposal: add full complement of support for decreasing things in Data.Map

David Feuer david.feuer at
Thu May 19 14:00:23 UTC 2016

Data.Map offers functions to convert from ascending lists to maps, and also
offers a function to map an increasing function over the keys of a map.
Equivalents for descending lists and decreasing functions are missing. I
think we should add them. Any objections?
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