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use strict;
use warnings;
...
    printf "%d lines\n\n", scalar(@lines);
}

duration memfh: 0.384 seconds
917504 lines
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duration trim : 0.201 seconds
917504 lines

duration memfh: 0.477 seconds
917504 lines
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duration trim : 0.259 seconds
917504 lines

duration memfh: 0.530 seconds
917504 lines
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duration trim : 0.261 seconds
917504 lines