Shorten some type signatures returning impl DoubleEndedIterator#721
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- Remove `FusedIterator` bound, which was redundant. (User code never needs to bind on `FusedIterator`, that trait is only used by the standard library for specialization.) - Remove redundant `+ 'a` bounds. - Remove redundant `Item = ...` from `ExactSizeIterator` bounds (there's no need to specify them twice).
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FusedIteratorbound, which was redundant. (User code never needs to bind onFusedIterator, that trait is only used by the standard library for specialization.)+ 'abounds.<Item = ...>parameter fromExactSizeIteratorbounds (there's no need to specify parameters twice).