g_unpack

# File activesupport/lib/active_support/multibyte/handlers/utf8_handler.rb, line 390
      def g_unpack(str)
        codepoints = u_unpack(str)
        unpacked = []
        pos = 0
        marker = 0
        eoc = codepoints.length
        while(pos < eoc)
          pos += 1
          previous = codepoints[pos-1]
          current = codepoints[pos]
          if (
              # CR X LF
              one = ( previous == UCD.boundary[:cr] and current == UCD.boundary[:lf] ) or
              # L X (L|V|LV|LVT)
              two = ( UCD.boundary[:l] === previous and in_char_class?(current, [:l,:v,:lv,:lvt]) ) or
              # (LV|V) X (V|T)
              three = ( in_char_class?(previous, [:lv,:v]) and in_char_class?(current, [:v,:t]) ) or
              # (LVT|T) X (T)
              four = ( in_char_class?(previous, [:lvt,:t]) and UCD.boundary[:t] === current ) or
              # X Extend
              five = (UCD.boundary[:extend] === current)
            )
          else
            unpacked << codepoints[marker..pos-1]
            marker = pos
          end
        end 
        unpacked
      end