wp-includes/Requests/src/Utility/InputValidator.php:28Verify that a received input parameter is of type string or is "stringable".
$inputmixedbool public static function is_string_or_stringable($input) { return is_string($input) || self::is_stringable_object($input); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/Requests/src/Utility/InputValidator.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.