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@one   = (('a') x 100);
@two   = (('a') x 1000);
@three = (('a') x 10000);

Benchmark: timing 10000 iterations of rev 100, rev 1000, rev 10000...
   rev 100:  0 wallclock secs ( 0.54 usr + -0.01 sys =  0.53 CPU) @ 18
+867.92/s (n=10000)
  rev 1000:  4 wallclock secs ( 5.52 usr + -0.01 sys =  5.51 CPU) @ 18
+14.88/s (n=10000)
 rev 10000: 59 wallclock secs (58.33 usr + -0.00 sys = 58.33 CPU) @ 17
+1.44/s (n=10000)