should_compress?

# File activesupport/lib/active_support/cache.rb, line 623
        def should_compress?(value, options)
          if options[:compress] && value
            unless value.is_a?(Numeric)
              compress_threshold = options[:compress_threshold] || DEFAULT_COMPRESS_LIMIT
              serialized_value = value.is_a?(String) ? value : Marshal.dump(value)
              return true if serialized_value.size >= compress_threshold
            end
          end
          false
        end