A cautionary tale: not all TreeSets are equal, but some are more equal than others.pic.twitter.com/mMC4bVJFwe
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I didn't need to look... what it's doing is as reasonable as what I'm doing is unreasonable: the Ordering I created considers there to be no difference in order between two Foos with the same id. The logic inside TreeSet uses that to equality-of-order to infer equality.
In terms of efficiency, that's a reasonable thing to do because the Ordering and an equals method may both be expensive and should probably do the same thing.
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But in my real-world use-case I was exploiting this as a convenient way of guaranteeing I never had two elements with the same ID in the same TreeSet (and giving the TreeSet's append method "replace semantics" for free).
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It feels like that should be done by passing in an alternative equals rather than order Feels weird to me
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