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Why does modern Perl avoid UTF-8 by default?
..._UNICODE=D or with i and o for particular ones of these; export PERL5OPTS=-CD would work. That makes -CSAD for all of them.
Cover both bases plus all the streams you open with export PERL5OPTS=-Mopen=:utf8,:std. See uniquote.
You don’t want to miss UTF-8 encoding errors. Try export PERL5OPTS=-Mwa...