Re: [dom] setAttributeNode and setAttributeNodeNS can be an aliases (#117)

So the basic proposal is that `setAttributeNode` have the behavior `setAttributeNodeNS` currently does, right?

I guess that would be OK with me, generally speaking.  

Is it true that this change of behavior only matters in cases when someone previously set an attribute via setAttribute (or perhaps setAttributeNode using a different Attr) and now is trying to reset the same attribute, but using a different case, using setAttributeNode?  Or are any other cases affected?

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