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    Do not declare interfaces for immutable objects Commented Jul 21, 2015 at 17:36
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    Thanks, @gnat. That post (both the question and the answer) seems to be talking about interfaces, as in Capital I Interfaces. I'm not sure that's what I'm doing. Commented Jul 21, 2015 at 17:46
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    @gnat, that is dreadful advice. Interfaces offer a great way of serving up publicly immutable VOs/DTOs that are still easy to test. Commented Jul 21, 2015 at 17:53
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    @gnat, I did and the question makes no sense as the OP seems to think that interfaces will destroy immutability, which is nonsense. Commented Jul 21, 2015 at 17:56
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    @gnat, that question was about declaring interfaces for DTOs. The top voted answer was that interfaces would not be harmful, but probably unnecessary. Commented Jul 22, 2015 at 5:05