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Matt Renaud authored
* Fix Foldable instance for IntMap. As reported in https://github.com/haskell/containers/issues/579 the Foldable instance for IntMap is unlawful and internally inconsistent. This was caused as a result of the internal representation used by IntMap. More specifically, `fold`, `foldMap`, and `traverse` (via `traverseWithKey`) always placed positively keyed entries before negative keyed ones. To fix this we need to check to see if the mask is positive or negative. Tested by adding new property tests, verifying they failed with the implementation at HEAD, and then passed after the changes.
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