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NB: this is work-in-progress, there is currently only one
provided implementation (MMapWeakList).
In the same spirit as MSets w.r.t FSets, the main difference between
MMaps and former FMaps is the use of a new version of OrderedType
(see Orders.v instead of obsolete OrderedType.v).
We also try to benefit more from recent notions such as Proper.
For most function specifications, the style has changed : we now use
equations over "find" instead of "MapsTo" predicates, whenever possible
(cf. Maps in Compcert for a source of inspiration). Former specs are
now derived in FMapFacts, so this is mostly a matter of taste.
Two changes inspired by the current Maps of OCaml:
- "elements" is now "bindings"
- "map2" is now "merge" (and its function argument also receives a key).
We now use a maximal implicit argument for "empty".
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