Collection class shouldn't cast to string?!

[buddhaCode]

Hi folks,
I just stumbled across a strange behavior where my collection object was implicitly casted to a string. This was odd and I was expecting a PHP type error instead. Or at least not a string cast.

So my question: Why does the collection class implement the __toString method. This doesn't make any sense to me.

Here my code:

class Foo {
  public function __construct(
    public string|array $bar
  )
}

$foo = new Foo(collect(['foo', 'bar']))

In this example $foo->bar ends up being a string ["foo", "bar"]. First I was expecting a type error. On a second thought, the collection is implementing the ArrayAccess interface. So I would expect an implicit cast to array.

What do you think?

Best,
Arne