Github user stain commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/26
Thanks for your review, @ajs6f! I've updated the text correspondingly.
I'll expand that it only needs to be immutable on `.equals()` term - not
object identity. Thus if you want you could make a `Triple` that returns a new
equivalent instance on every call to `getSubject()` etc without having to cache
- I think the RDF4J `TripleImpl` does that.
I don't think `default` methods fit here, as sadly you can't provide those
for `java.lang.Object` methods like `.equals()` and `hashCode()`.
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