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Compare of versions of some pages fail with error message undefined method `deep_clone' for #. This caused by presence of comments in the page HTML. This is easily fixed with different tidy config. Add line hide-comments: yes to tidy.cfg. Recommneded is to also add the following property. drop-proprietary-attributes: yes The change to tidy.cfg does not require a restart of the webserver.
Change tidy config
OK