wp-admin/includes/class-wp-comments-list-table.php:574Gets a list of sortable columns.
array<string, protected function get_sortable_columns() { return array( 'author' => array( 'comment_author', false, __( 'Author' ), __( 'Table ordered by Comment Author.' ) ), 'response' => array( 'comment_post_ID', false, _x( 'In Response To', 'column name' ), __( 'Table ordered by Post Replied To.' ) ), 'date' => 'comment_date', ); }One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
array to array<string,.verified against sourcesrc/wp-admin/includes/class-wp-comments-list-table.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.