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Fix Spliterator implementations for sorted collections #6188

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Fix Spliterator implementations for sorted collections #6188

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Commits on Oct 18, 2022

  1. Fix Spliterator implementations for sorted collections 

    Spliterators returned by CollectSpliterators.indexed and ImmutableSortedSet.spliterator
violated the Spliterator API by not returning null in getComparator when the source
items are naturally sorted. The effect was that sort operations on Streams backed by
these Spliterators were not optimized away, resulting in additional unnecessary sorting.

Fixes google#6187.
    @kilink
    kilink committed Oct 18, 2022
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