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my $s="\x{5fcd}\x{65e0}\x{53ef}\x{5fcd}";
use Encode;
print length encode("utf8", $s), "\n"; # 12

print do {use bytes; length($s)}, "\n"; # 12 (see perldoc -f length)

...

utf8::encode($s); # resets the utf8 flag
print length($s), "\n"; # 12