Map#containsKey throws a NullPointerException when null is passed as the argument and the map is not empty

[DRobinson4105]

Map<Integer, Integer> map = Map.of(); System.out.println(map.containsKey(null));

prints false

Map<Integer, Integer> map = Map.of(); map = map.put(1, 1); System.out.println(map.containsKey(null));

throws a NullPointerException