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<?php interface Bar {} class Baz implements Bar {} class Foo { public function __construct( public Bar $bar = new Baz() ) {} public function doThing(Bar $bar = new Baz()) { return $bar; } } var_dump(new Foo()); var_dump((new Foo)->doThing());
Output for git.master, git.master_jit
object(Foo)#1 (1) { ["bar"]=> object(Baz)#2 (0) { } } object(Baz)#3 (0) { }

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