Benchmark: timing 200000 iterations of A_unpack_line_no_array, substr_into_array, substr_no_array, unpack_line_into_array, unpack_line
_no_array...
A_unpack_line_no_array:  3 wallclock secs ( 1.56 usr +  0.00 sys =  1.56 CPU) @ 128205.13/s (n=200000)
substr_into_array: 21 wallclock secs (21.54 usr +  0.00 sys = 21.54 CPU) @ 9285.05/s (n=200000)
substr_no_array:  5 wallclock secs ( 4.82 usr +  0.00 sys =  4.82 CPU) @ 41493.78/s (n=200000)
unpack_line_into_array: 10 wallclock secs (10.62 usr +  0.00 sys = 10.62 CPU) @ 18832.39/s (n=200000)
unpack_line_no_array:  1 wallclock secs ( 1.48 usr +  0.00 sys =  1.48 CPU) @ 135135.14/s (n=200000)
                           Rate substr_into_array unpack_line_into_array substr_no_array A_unpack_line_no_array unpack_line_no_array
substr_into_array        9285/s                --                   -51%            -78%                   -93%                 -93%
unpack_line_into_array  18832/s              103%                     --            -55%                   -85%                 -86%
substr_no_array         41494/s              347%                   120%              --                   -68%                 -69%
A_unpack_line_no_array 128205/s             1281%                   581%            209%                     --                  -5%
unpack_line_no_array   135135/s             1355%                   618%            226%                     5%                   --