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I'm not convinced that this is the right way to cache comments, so feedback is welcome. Change-Id: I2bd393b80e05c26199020e19daf0eadeb99d8c2b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/199303 Commit-Queue: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>