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Add a new node to @parent, at the end of the child (or property) list
merging adjacent TEXT nodes (in which case @cur is freed)

Which means we can potentially have disappearing nodes. Should I also
file a feature request to have the auto coalescing be toggleable? I
don't think there is any good way of solving this ourselves.

I guess this would also be a vote for importing libxml2 (or at least
forking it).

Mike.