@Region Philbis,
It is, and it's the way it is intended to work here at present too to answer
ehBeth's question.
But it's not always consistently so (for technical reasons I'm too tired to explain coherently), and we are also toying with the idea of permanent read tracking (upside is that it's session independent, downside is that they'd build up quite a bit and may need mechanisms to mark them read without reading them then).