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<?php function updateObject(object $object): void { $object->newProperty = true; } $obj = new stdClass; var_dump($obj); updateObject($obj); var_dump($obj);
Output for git.master, git.master_jit, rfc.property-hooks
object(stdClass)#1 (0) { } object(stdClass)#1 (1) { ["newProperty"]=> bool(true) }

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