comment on

:utf8 on input is insecure.

binmode STDIN,  ":utf8";
binmode STDOUT, ":utf8";
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should be

binmode STDIN,  ":encoding(UTF-8)";
binmode STDOUT, ":encoding(UTF-8)";
binmode STDERR, ":encoding(UTF-8)";
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and can be replaced with

use open ':std', ':encoding(UTF-8)';
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or better yet

use open ':std', ':locale';
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:utf8 on input is insecure.

open(IN, "<utf8", "sample.txt");
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should be

open(IN, "<:encoding(UTF-8)", "sample.txt");
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and can be replaced with

use open IO => ':encoding(UTF-8)';
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use open IO => ':locale';
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use utf8;
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indicates the source file is encoded using UTF-8. Without it, Perl assumes it's encoded using iso-latin-1.

None of the above decodes the content of @ARGV, data read from open(FH, '-') or data read via <>. The last is being worked on.

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