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Topic RSS feeds contain many non canonical links such as: - https://site.com/t/a-b-c/111/1 - https://site.com/t/a-b-c/111/2 - https://site.com/t/a-b-c/111/3 - https://site.com/t/a-b-c/111/4 - https://site.com/t/a-b-c/111/5 - https://site.com/t/a-b-c/111/6 Previously we were not indexing RSS feeds yet still following these links. This change means we totally ignore links in the RSS feeds which avoids expensive work scanning them just to find we should not include them.