Github user afs commented on the issue:
https://github.com/apache/jena/pull/212
@rvesse - so this is specific about `deleteFrom`. Good point that
`contains()` may be not low cost.
I have realized that we can use the fact that often there is no code
listing to events by calling `Graph.getEventManager().listening()`. The code
can have one path when events are needed, to get the perfect legacy contract,
and another path for when events are not needed because no code is listening.
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