Extend higher limit constraints to attachments on article threads

I had almost filed this as a bug based off my initial interpretation from the announcement about article threads, specifically this section:

XenForo said:
we automatically allow more characters and images to reflect the fact that articles will often be longer and more complex than your average forum post.
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source https://xfworld.net/threads/extend-higher-limit-constraints-to-attachments-on-article-threads.47164/