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<?php class A { public function __construct( public readonly \StdClass $obj = new \StdClass() ) {} } $a = new A(); $a->obj->hello = "world"; var_dump($a);
Output for git.master_jit, git.master
object(A)#1 (1) { ["obj"]=> object(stdClass)#2 (1) { ["hello"]=> string(5) "world" } }

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