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In prep for [1], benchmark `dartify` performance when converting JS call return values to Dart values. [1]: https://dart-review.googlesource.com/c/sdk/+/424021 Change-Id: I43549276f0ccdfefcc689c0574f82cad4a856aa5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/424940 Commit-Queue: Ömer Ağacan <omersa@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>