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The nullability of ExtensionType is affected by the representation type. Change-Id: I2eb0aa7ee26caf97c2bc9c2bdec58369f5b598f8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/329920 Commit-Queue: Chloe Stefantsova <cstefantsova@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>