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It's not clear that we need two; I kept the one with the better `toString`. R=jakemac@google.com Change-Id: I80934c0f1b05b0c486105654b03b628e7acf439b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/341920 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Morgan :) <davidmorgan@google.com> Reviewed-by: Jake Macdonald <jakemac@google.com> Auto-Submit: Morgan :) <davidmorgan@google.com>