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See internal bug 36371258. We're hitting type errors of the form: CastError: Casting value of type '_Future' to incompatible type 'FutureOr<int>' I suspect these type errors were there but just ignored before - does this seem a reasonable extension to the whitelist? R=jmesserly@google.com Review-Url: https://codereview.chromium.org/2752203003 .