checked?

# File actionview/lib/action_view/helpers/tags/check_box.rb, line 42
          def checked?(value)
            case value
            when TrueClass, FalseClass
              value == !!@checked_value
            when NilClass
              false
            when String
              value == @checked_value
            else
              if value.respond_to?(:include?)
                value.include?(@checked_value)
              else
                value.to_i == @checked_value.to_i
              end
            end
          end