# File lib/cfpropertylist/rbBinaryCFPropertyList.rb, line 544
    def bool_to_binary(val)

      @object_table[@written_object_count] = val ? "\x9" : "\x8" # 0x9 is 1001, type indicator for true; 0x8 is 1000, type indicator for false
      @written_object_count += 1
      @written_object_count - 1
    end