If you do not "use utf8;", then it is predictable that your line
my @bytes = unpack("U*",$input); end up with bytes but not chars splitting.
I advice you to write "use utf8;" at the very start of program but sometimes use local scopes with "no utf8;" when needed.
Also, you really do not need to re-implement utf8<->code-points character transformation. It is done simplier:
use utf8;
use Encode;
my $utf8str = decode("ucs-2",$input); # or "euc-jp", depends on $input
See "perldoc Encode" to see what I mean, it contains a lot of answers to your questions!
Courage, the Cowardly Dog
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