MapEqualty Hash collides easily

[SShayashi]

From the MapEquality documentation, I thought that the combination of key and value must be the same to have a collision, but the value can be swapped and the hash value will still be the same. For example, the following maps have the same hash value.

import 'package:collection/collection.dart';

void main() {
  final map01 = {
    'key1': 1,
    'key2': 0,
    'key3': 'a',
  };
  final map02 = {
    'key1': 'a',
    'key2': 1,
    'key3': 0,
  };
  final hash01 = DeepCollectionEquality().hash(map01);
  final hash02 = DeepCollectionEquality().hash(map02);
  print(hash01 == hash02); // true.
}

Is this expected behavior?

dart info

``` $ dart info If providing this information as part of reporting a bug, please review the information below to ensure it only contains things you're comfortable posting publicly. #### General info - Dart 3.2.0 (stable) (Tue Nov 14 18:26:59 2023 +0000) on "macos_arm64" - on macos / Version 13.4 (Build 22F66) - locale is ja-JP #### Process info | Memory | CPU | Elapsed time | Command line | | -----: | ---: | -----------: | ------------------------------------------------------------------------------------------ | | 426 MB | 0.0% | 01-20:23:25 | dart language-server --client-id=Android-Studio --client-version=AI-222.4459.24 --protocol=analyzer | | 51 MB | 0.0% | 01-20:23:25 | flutter_tools.snapshot daemon ```

[lrhn]

It could probably be improved. It's an unordered hash, so the hashed of the entries are just xor'ed, but it probably should be an unordered hash of better hashed entries.