[PHP] How to provide type for foreach items in class implementing IteratorAggregate?

This is the scenario:    

$myObject = new MyClassImplementingIteratorAggregate();
foreach($myObject as $item){
    $item->[ AUTOCOMPLETE HERE]
}

I was doing this in multiple ways inside PhpTypeProvider2, and was working fine but with almost every update in PhpStorm it stops working.

I can see there is a PhpTypeProvider4 now (not sure what is the difference)

But the problem with my current code is $item was a VariableDecl before, now that class does not even exist, I think it was replaced by VariableImpl but when I check VariableImpl::isDeclaration() for $item it returns false.     

Is there any recommended way to provide the correct type for foreach items?

Thanks !!