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use strict; 
use warnings; 
...

    }
);

Benchmark: timing 5 iterations of bw, tied...
        bw:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)
      tied: 69 wallclock secs (50.44 usr + 14.67 sys = 65.11 CPU) @  0
+.08/s (n=5)

Benchmark: timing 1500 iterations of bw, tied...
        bw:  1 wallclock secs ( 0.36 usr +  0.30 sys =  0.66 CPU) @ 22
+83.11/s (n=1500)
      tied:  5 wallclock secs ( 2.05 usr +  3.31 sys =  5.36 CPU) @ 27
+9.90/s (n=1500)