# File lib/friendly_id/slug_string.rb, line 177
      def word_chars!
        @wrapped_string = normalize_utf8(:c).unpack("U*").map { |char|
          case char
          # control chars
          when 0..31
          # punctuation; 45 is "-" (HYPHEN-MINUS) and allowed
          when 33..44
          # more puncuation
          when 46..47
          # more puncuation and other symbols
          when 58..64
          # brackets and other symbols
          when 91..96
          # braces, pipe, tilde, etc.
          when 123..191
          else char
          end
        }.compact.pack("U*")
      end