# File lib/aws/s3/acl_options.rb, line 136
      def grant_hash? acl_hash
        grant_keys = [
          :grant_read,
          :grant_write,
          :grant_read_acp,
          :grant_write_acp,
          :grant_full_control,
        ]
        acl_hash.keys.all?{|key| grant_keys.include?(key) }
      end