$Stack->add()

$Stack->add($obj);

Adds $obj to $Stack. If an item with the same id field as $obj is already in the stack, $obj is assumed to already be in the stack and is not added.

It is important to note that simply adding an object to a stack does not modify it's contents in any way. That is, it does not set the object's contents so that it would appear in that stack again, were it recreated.

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