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Benchmark: timing 200000 iterations of A_unpack_line_no_array, substr_
+into_array, substr_no_array, unpack_line_into_array, unpack_line
_no_array...
...
substr_no_array         41494/s              347%                   12
+0%              --                   -68%                 -69%
A_unpack_line_no_array 128205/s             1281%                   58
+1%            209%                     --                  -5%
unpack_line_no_array   135135/s             1355%                   61
+8%            226%                     5%                   --

Benchmark: timing 200000 iterations of A_unpack_line_no_array, substr_
+into_array, substr_no_array, unpack_line_into_array, unpack_line_no_a
+rray...
A_unpack_line_no_array:  2 wallclock secs ( 2.53 usr +  0.00 sys =  2.
+53 CPU) @ 79051.38/s (n=200000)
...
A_unpack_line_no_array  79051/s                    67%               5
+9%                     --                 -17%            -67%
unpack_line_no_array    95238/s                   101%               9
+1%                    20%                   --            -60%
substr_no_array        238095/s                   402%              37
+9%                   201%                 150%              --

#substr_into_array:
      sub {
...
@236a4
', $_[0]);
};