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Mark cross-duplicates with tags until cross-closing is available
I think it would be reasonable to introduce a new tag, "cross-duplicate-candidate" to tag cross-category or cross-community duplicates with until the software is updated to allow closing them. We're already identifying these posts now, and it's wasted resources to leave them to be forgotten. If we have such a tag, we can do a much simpler swoop of them all at a time (still manually, though) once cross--duplicate-closing is available.
The process for marking posts would be quite simple: simply add "cross-duplicate-candidate" as a tag to the post, and leave a comment specifying which post it's a duplicate of.
The description for the tag should be quite simple; state the purpose of the tag, and link back to this post.
Examples of cross-duplicates:
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