Josh Stone b0f8bd7438 Add BTreeSet entry APIs to match HashSet
* `fn get_or_insert(&mut self, value: T) -> &T`
* `fn get_or_insert_with<Q: ?Sized, F>(&mut self, value: &Q, f: F) -> &T`
* `fn entry(&mut self, value: T) -> Entry<'_, T, A>` (+ `Entry` APIs)
2024-11-27 10:51:24 -08:00
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