Fully-strict version of Data.IntMap.Strict

Unlike Data.IntMap.Strict IntMap which is an alias to Data.IntMap.Lazy IntMap, the instances of our IntMap are all strict as well.

You should be able to switch from the former simply by changing your module imports, and your package dependency from containers to strict-containers. If this doesn't work, please file a bug.

The documentation in the auto-generated modules have not been updated in a particularly sophisticated way, so may sound weird or contradictory. In those cases, please re-interpret such weird wording in the context of the above.