instance method cache_key

# File activesupport/lib/active_support/vendor/i18n-0.4.1/i18n/backend/cache.rb, line 66
        def cache_key(*args)
          # This assumes that only simple, native Ruby values are passed to I18n.translate.
          # Also, in Ruby < 1.8.7 {}.hash != {}.hash
          # (see http://paulbarry.com/articles/2009/09/14/why-rails-3-will-require-ruby-1-8-7)
          # If args.inspect does not work for you for some reason, patches are very welcome :)
          hash = RUBY_VERSION >= "1.8.7" ? args.hash : args.inspect
          keys = ['i18n', I18n.cache_namespace, hash]
          keys.compact.join('-')
        end