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$ perl -le'use open ":std", ":locale"; $_="\xE0 la plage"; utf8::downg
+rade($_); print "\u$_"'
à la plage

$ perl -le'use open ":std", ":locale"; $_="\xE0 la plage"; utf8::upgra
+de($_); print "\u$_"'
À la plage

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open(my $fh, '<:encoding(UTF-8)', $qfn)
    or die("Can't open file $qfn: $!\n");