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  Information processing model beginning with perl 5.8
 
    +----------------------+---------------------+
    |     Text strings     |                     |
    +----------+-----------|    Binary strings   |
    |  UTF-8   |  Latin-1  |                     |
    +----------+-----------+---------------------+
    | UTF8     |            Not UTF8             |
    | Flagged  |            Flagged              |
    +--------------------------------------------+
    http://perl-users.jp/articles/advent-calendar/2010/casual/4

  Confusion of Perl string model is made from double meanings of
  "Binary string."
  Meanings of "Binary string"
  1. Non-Text string
  2. Digital octet string

  Let's draw again using those term.
 
    +----------------------+---------------------+