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Created attachment 8990 [details]
Sample program. subSet has count of 3. subSet.Reverse().Count() returns 0.
`SortedSubSet::Reverse()` called on a non-empty Sorted created via `SortedSet::GetViewBetween()` returns an IEnumerable over an empty set.
I think this is a bug due to implementation of `SortedSubSet/SortedSet::Reverse()`, because the loop in the implementation of `Reverse` is based on `tree.Count`.
I am not sure where this value is taken from for a call made from SortedSubSet, whether it's the host's tree or not intialized at all. Though, I couldn't find any place where the `GetItem` would get information that the call is being made for the view of a tree, not the full one.
I attached a simple program depicting the issue.
Fixed in master