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The serializer uses these to cache instances of DictionaryTypeMask for indexing. If these produce inconsistent results we can end up with different caching patterns leading to different serialized outputs. Change-Id: I8550f6fc1cb2bb32a68b3274e6add2e7ee56930d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/403483 Auto-Submit: Nate Biggs <natebiggs@google.com> Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Mayank Patke <fishythefish@google.com>