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kotlinlang

Could we get a `TreeMap` in the standard library?

btw TreeMap/TreeSet potentially break the rules of collections a bit…
<https://pl.kotl.in/W9XwYAVQn|https://pl.kotl.in/W9XwYAVQn>

I do agree that it would be nice to have a sorted collection and association nonetheless. maybe with b-trees instead of rbtrees like java…

Is the problem just that `equals` in the Java stdlib doesn't behave the same as other `Set` collections?

more that `contains` is based on the comparator, which makes sense (otherwise it would be inconsistent with `get`/`put`/etc.), but breaks equality with collections which don't have the same equivalence classes on their items

Is that a common problem? I knew about it, but I've never had any problems because of that

the general case is explicitly called out in the second paragraph of <https://docs.oracle.com/javase/8/docs/api/java/util/TreeMap.html|https://docs.oracle.com/javase/8/docs/api/java/util/TreeMap.html>