Github user rvesse commented on the issue: https://github.com/apache/jena/pull/212 My concern is that depending on the underlying storage of the data in the graphs a call to `contains()` might be quite expensive and it would be more efficient to simply call `delete()` directly. You appear to have provided a flag to force the old behaviour so I think go ahead and merge this. Since if any user does encounter performance regressions we can advise them of the workaround and use a concrete report as the basis for any further optimisation.
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