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As of [32484], `wp_dropdown_categories()` uses the `$value_field` value to decide whether a given `<option>` should be 'selected'. However, `$value_field` can refer to a value that is a string, such as a category's slug. This causes problems when doing a loose comparison (`==`) with the value of the `'selected'` parameter, which defaults to `0`, because when doing a loose comparison between an integer and a string, PHP will cast the string to an integer. This creates false matches, resulting in `<option>` elements getting a 'selected' attribute incorrectly. We address the issue by casting the comparison values to strings, and then using the strict comparison operator `===`. Fixes #33452 for trunk. git-svn-id: https://develop.svn.wordpress.org/trunk@33681 602fd350-edb4-49c9-b593-d223f7449a82