options_for

# File activesupport/lib/active_support/json/encoding.rb, line 62
        def options_for(value)
          if value.is_a?(Array) || value.is_a?(Hash)
            # hashes and arrays need to get encoder in the options, so that
            # they can detect circular references.
            options.merge(:encoder => self)
          else
            options.dup
          end
        end