in PHP we have a set of comparison operators going like

$a == $b (has same value)
$a === $b (has same value and type)

shouldn't we have also something like
$a =&= $b (is same instance)?

Maybe we already have it and I just don't know about it. Is that so?
Because of the copy/reference mechanism it would really be helpful in 
order to check one's work in referencing objects.


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