Github user ajs6f commented on the issue:
https://github.com/apache/jena/pull/274
I'm not that worried about this case. (Although I would actually have fewer
special graph names and more types, but that's just my taste; I'm not arguing
that we should change that now.) It was more your first remark about "Else,
we'd end up with `Optional<Node>` all over the place" and the fact that I don't
feel like we have a clear way to make any changes at all to the core SPI and
API. This (PR) isn't really the right place for the larger discussion-- I'll
take it to dev@.
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