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Lingua::JA::Regular::Unicode module

Old Jcode had a method called h2z that converts half-width katakana to full-width katakana, but modern Perl doesn't use Jcode. In modern Perl, it's best to treat strings as decoded strings inside your program.

I think it's a good idea to use the katakana_h2z function of the Lingua::JA::Regular::Unicode module to replace the old code.

use utf8;
use Lingua::JA::Regular::Unicode 'katakana_h2z';
my $str_h = 'Aiueo';
my $str_z = katakana_h2z $str_h;

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