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[Raab, Donald]

We have methods to toSortedSet() and toSortedMap() that return SortedSet and SortedMap (as the names imply).  We remain compatible back to Java 5, where NavigableSet  and NavigableMap do not exist.  

I would request either calling the methods toNavigableSet()/toNavigableMap() and returning NavigableSet/NavigableMap or having both toSorted and toNavigable forms and returning the appropriately named types. 


> 
>      Object[] toArray();
>      Set<T> toSet();
>      List<T> toList();
>      List<T> toRandomAccessList();
>      List<T> toSortedList(Comparator<? super T> comparator);
>      List<T> toSortedList();
>      NavigableSet<T> toSortedSet();
>      NavigableSet<T> toSortedSet(Comparator<? super T> comparator);
>      Collection<T> toBag(); // unordered, possible dups
>      <K> Map<K,T> toMap(Function<? super T,K> keyFn, BinaryOperator<T>
> mergeFn);
>      <K> Map<K,<Collection<T>> toMap(Function<? super T,K> keyFn);
>      <K> NavigableMap<K,T> toSortedMap(Function<? super T,K> keyFn,
>                                        Comparator<? super K> comparator,
>                                        BinaryOperator<T> mergeFn);
>      <K> NavigableMap<K,Collection<T>> toSortedMap(Function<? super T,K>
> keyFn,
>                                                    Comparator<? super K>
> comparator);