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my Str $data = slurp $file_name;
my $fh = IO::String.new($data);
my $csv = Text::CSV.new(';', '"');    
my @column = $csv.getline_all($fh).map( *[$target_col] );

> raku clean_class.raku PPP_DSP_2002-2021.csv
Flattened array has 150000 elements, but argument lists are limited to
+ 65535
...
  in block  at 'SETTING::'src/core.c/Main.pm6 line 421
  in sub RUN-MAIN at 'SETTING::'src/core.c/Main.pm6 line 416
  in block <unit> at clean_class.raku line 15

        @!content.push: |@x;

        @!content.push: $_ for @x;