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    filehandle => sub {
        my @lines;
...
            push @lines, $_;            
        }
    },

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perlbrew exec bench_script.pl

...
regex      3.98/s        33%         --       -33%       -37%
split      5.91/s        97%        49%         --        -6%
filehandle 6.31/s       111%        59%         7%         --

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perl-5.30.0
===========
...
index      11.2/s        12%         --       -23%       -25%
split      14.6/s        46%        30%         --        -2%
filehandle 14.9/s        49%        33%         2%         --

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perl-5.28.1 (Windows 10 Pro)
============================
...
index      9.46/s        17%         --        -3%       -22%
filehandle 9.73/s        20%         3%         --       -20%
split      12.2/s        50%        29%        25%         --

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perl -V
=======
...
    C:/Strawberry/perl/site/lib
    C:/Strawberry/perl/vendor/lib
    C:/Strawberry/perl/lib