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utf8::downgrade( my $d = "\xE3" );
printf "%vX\n", $d;                          # E3
...
printf "%vX\n", $w;                          # 2660
printf "%d\n", utf8::is_utf8( $w ) ? 1 : 0;  # 1
printf "%vX\n", transform( $w );             # E2.99.A0