Github user ajs6f commented on the issue:
https://github.com/apache/jena/pull/274
If we ever want to use `Optional` at all (and I would, I think it is clear
and avoids special names in many cases), we have to start somewhere (or we have
to make a massive sudden change to the Graph SPI, maybe 4.0?). I don't want to
make a fuss, I would just like to be able to gradually introduce it. Maybe not
on this PR, and maybe gradual isn't better than a big change at 4.0.
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