Commits on Aug 11, 2021

1. Weaken guarantee around advancing underlying iterators in zip …

   The current guarantee is too strong as it would prevent adapters
   from exploiting knowledge about the iterator length and using counted
   loops for example because they would stop calling `next()` before
   it ever returned `None`. Additionally several nested zip iterators
   already fail to uphold this.
   
   This doesn't remove any of the specialization code that tries
   (and sometimes fails) to uphold the guarantee for `next()`
   because removing it would also affect `next_back()`
   in more surprising ways.

   

   the8472 committed Aug 11, 2021
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