Jean Tissot

The issue is in [RecursiveComparisonDifferenceCalculator#compareUnorderedMap](https://github.com/assertj/assertj/blob/main/assertj-core/src/main/java/org/assertj/core/api/recursive/comparison/RecursiveComparisonDifferenceCalculator.java#L699). The actual and expected keysets are compared using the `equals` method (as `Map#removeAll` uses `equals`): ``` Set expectedKeysNotFound = new LinkedHashSet(expectedMap.keySet()); expectedKeysNotFound.removeAll(actualMap.keySet()); if (!expectedKeysNotFound.isEmpty()) {...

Hi, I'd like to contribute to this issue. What should I now before doing this (besides what I read in the contribution guidelines)? I was able to add a [test...