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run code in 300+ PHP versions simultaneously
<?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());

preferences:
86.75 ms | 404 KiB | 5 Q