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Benchmark: running F_plus, F_sexeger, F_while, P_plus, P_sexeger, P_wh
+ile, each for at least 5 CPU seconds...
    F_plus:  6 wallclock secs ( 5.38 usr +  0.02 sys =  5.40 CPU) @ 38
+010.19/s (n=205255)
...
P_while    58260/s      68%      53%        8%      --      -29%    -4
+2%
F_sexeger  82085/s     137%     116%       52%     41%        --    -1
+8%
F_while    99934/s     188%     163%       85%     72%       22%      
+--

#!/usr/bin/perl

...
    $x = reverse $x;
  },
});