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This addresses two instances where a function that is documented as returning `{someType}|null` doesn't explicitly return `null`. Affected functions: * `array_key_first()` * `WP_REST_Posts_Controller::handle_terms()` Follow-up to [38832], [52038]. Props justlevine. See #52217. Built from https://develop.svn.wordpress.org/trunk@59453 git-svn-id: http://core.svn.wordpress.org/trunk@58839 1a063a9b-81f0-0310-95a4-ce76da25c4cd