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          Though the ideal max_splits for n
          < 1
          million (or so) on x86 seems
          to be substantially larger, enabling a roughly 15% speedup for such tests,
          this optimization isn't general, and doesn't apply for n
          > 1
          million. A too large max_splits
          can cause sort to take more than twice as long, so it should be set on
          the low end of the reasonable range, where it is right now.