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$_ = 12;        # Value is 12, the number of months in a year.
print "$_\n";   # Value is still 12, the number of months in a year,
                #    just stored differently.

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$_ = "\x80\x81";    # Value is bytes 80 81
utf8::upgrade($_);  # Value is still bytes 80 81,
                    #    just stored differently.
print(length($_), "\n");  # 2