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Check string size for non ascii code

#!/usr/bin/ruby -Ku -rjcode string = "\xef\xbc\xa1" + "\xef\xbc\xa2" + "\xef\xbc\xa3" +          "\xef\xbc\xa4" + "\xef\xbc\xa5" + "\xef\xbc\xa6" string.size                                            # => 18 string.jsize                                           # => 6