Parameter Attribute for expected class attributes

[AlexLisenkov]

Suggestion to add an attribute to ensure an instance has a class attribute.

class ExpectsAttribute
{
    public function __construct(
        #[ExpectedAttribute(CustomAttribute::class)]
        object $instance,
    ) {
        $this->instance = $instance;
    }
}

#[CustomAttribute]
class MyOKClass
{
}

class NotOKClass
{
}

// OK
new ExpectsAttribute(new MyOKClass());

//    Expects parameter 1 to have CustomAttribute
new ExpectsAttribute(new NotOKClass());

Thoughts?