ppkarwasz commented on PR #628:
URL: 
https://github.com/apache/commons-collections/pull/628#issuecomment-5482556873

   I closed COLLECTIONS-838 and on COLLECTIONS-722 I left this comment:
   
   > I’m keeping this issue open to track a potential further enhancement to 
`chainedIterator()`: collapsing nested `ChainedIterator` instances into a 
single iterator. This optimization would make each `hasNext()` and `next()` 
call run in constant time.
   
   I would need to double-check, but I think this PR closes that gap.


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