Deduplicate returns an iterator that skips the elements that have already been returned from [it].

Filter returns an iterator that skips the elements in [it] that return true from [filter].

FromSlice returns an iterator that contains [elements] in order.

FromTree returns a new iterator of the stakers in [tree] in ascending order.

Merge returns an iterator that returns all of the elements of [iterators] in order.

ToSlice returns a slice that contains all of the elements from [it] in order.

Empty is an iterator with no elements.

Iterator defines an interface for iterating over a set.