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              /* check the SV for UTF8 and seperate use bytes handling */
              if (!has_utf8)
                {
                  if (He_IS_SVKEY(he))
                    has_utf8 = SvUTF8(HeSVKEY(he));
                  else
                    has_utf8 = HeKUTF8(he);
                }
            }

          /* Undefined behaviour when the two iterations do not result in the same count.
             With threads::shared or broken tie. The last HEs might be NULL then or we'll
             miss some. */
          if (i != count)
            croak ("Unstable %shash key counts %d vs %d in subsequent runs",
                   is_tied ? "tied " : "", (int)count, (int)i);
          assert (i == count);

          /* one key does not need to be sorted */
          if (count > 1)
            {