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The new 'value_field' parameter makes it possible to set term slugs (or some other term property) as the 'value' attribute of the option elements generated by `wp_dropdown_categories()`. This additional flexibility reduces the effort required to translate term_id to other term fields when processing form submissions that include values from taxonomy dropdowns. See #30865 for a use case. Props collinsinternet. Fixes #30306. git-svn-id: https://develop.svn.wordpress.org/trunk@31006 602fd350-edb4-49c9-b593-d223f7449a82