New parameters custom_taxonomy_slug, custom_taxonomy_field and custom_taxonomy_term to filter by custom taxonomies, such as product_tag or product_cat: … &custom_taxonomy_slug=product_cat&custom_taxonomy_field=slug&custom_taxonomy_term=shelf-warmers
New parameter each_once to pick each post only once when using redirect_to=random. Use each_once=rewind to start over again after all posts are done. each_once= with a target post/page ID to finish there. Works only if visitors have cookies enabled.
New parameters comment_count, comment_count_min (>=) and comment_count_max (<=) to filter by comment count. The value is always an integer. comment_count also takes negative values, which means “not”. Requires WordPress 4.9+.
Other
Whitelisted more tracking parameters for Google and Matomo Analytics.