Description:
------------
i, i hope to see something like this in future php releases


interface Identifiable
{
     public function /*string*/ hashCode();
}


class Test implements Identifiable
{
     public function hashCode(){return spl_object_hash($this);}
}


method hashCode() should be called in these contexts:


$myarr[new Test()] = "test";
$myarrobj->{new Test()} = "test";
and manually inside:
function method(Identifiable $instance){};


the hash should be obtained by calling

$obj->hashCode()     if it is Identifiable or
$obj->scalarValue()  if it implements ScalarAccess
$obj->__toString()   if it has method __toString

or, finally throw an error

what do you think about this?
thank you