> + marker = set.getNextMarker();
> + iterator = set.iterator();
> + }
> +
> + @Override
> + public boolean hasNext() {
> + return iterator.hasNext() || marker != null;
> + }
> +
> + @Override
> + public StorageMetadata next() {
> + while (true) {
> + if (!iterator.hasNext()) {
> + advance();
> + }
> + StorageMetadata metadata = iterator.next();
I rewrote this to use `AdvancingIterator` although I do not understand the
suggestion to use concat -- could you expand on this?
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