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As far as technical documentation goes, I think this is done: https://www.mediawiki.org/wiki/Edit_Review_Improvements/New_filters_for_edit_review/How_to_implement_a_filter
As far as technical documentation goes, I think this is done: https://www.mediawiki.org/wiki/Edit_Review_Improvements/New_filters_for_edit_review/How_to_implement_a_filter