[PHP-INTERNALS] array type hint and SPL array interfaces

Hi Marcus!

I wondered, why PHP complains, if you have an array type hint in a
method prototype and provide an object to this method, that implements
the SPL interfaces to use objects as arrays. I would expect that, if an
object can be handled exactly like an array, PHP should not complain,
since the implementation of the method would not notice the difference.
Or am I wrong?

Regards,
Toby