Github user stain commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/19
btw.. neither `TripleLike` or `QuadLike` have defined equality semantics
(beyond Object.equals()) - so I've clarified that in
[`GraphLike`](file:///home/stain/src/incubator-commonsrdf/target/site/apidocs/org/apache/commons/rdf/api/GraphLike.html)
as that would obviously affect its `.contains()` and `.remove()` methods:
> As `TripleLike` do not have a specific `Object.equals(Object)` semantics,
the behaviour of methods like `contains(TripleLike)` and `remove(TripleLike)`
is undefined for arguments that are not object identical to previously added or
returned `TripleLike` statements.
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