For everything below, cloned could also be copied.
You can't use Iterator::cloned with the iterators from maps because their items are (&K, &V) rather than &Something. Could we add iter_cloned to HashMap and BTreeMap for this use-case?
You can do hashmap.iter().map(|(k, v)| (k.clone(), v.clone())).
Yes this is a convenience function that resolves to that, similar to how copied and cloned are convenience functions.
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