> - Could the Item::swap function be implemented on JSONObjects, JSONArrays, and
> the base-class for all nodes instead of for Item. It seems like that checking
> if a node is the root and swapping the tree in XmlNode::swap would be
> sufficient. That seems to be more consistent with the way other functions are
> implemented. It also seems to avoid the switch in Item::swap and the
> replication of raising ZSTR0050.

The issue is that access to protected members of Item is needed. They cannot be 
accessed in XmlNode.
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