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#!perl

...
    my $length_in_bytes = length $bytes;
    print "Length of text '$bytes' in bytes is $length_in_bytes\n";
}

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Length of text 'É' in characters is 1
Length of text 'É' in bytes is 1
"\x{00c3}" does not map to cp437 at a.pl line 22.
"\x{0089}" does not map to cp437 at a.pl line 22.
Length of text '\x{00c3}\x{0089}' in bytes is 2