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We could possibly call distinct on externs to remove dupes in the common case where externs may appear multiple times accidentally on the classpath.
Comment made by: dnolen
I don't think we want to silently dedupe. We probably want to also warn so users can fix the issue. The only reason to even do this ticket is because the Closure warning is so unfriendly and fails the build.
Comment made by: lxsameer
got it, I'll improve the patch