encode_params

# File actionpack/lib/action_dispatch/http/parameters.rb, line 43
      def encode_params(params)
        return params unless "ruby".encoding_aware?

        if params.is_a?(String)
          return params.force_encoding("UTF-8").encode!
        elsif !params.is_a?(Hash)
          return params
        end

        params.each do |k, v|
          case v
          when Hash
            encode_params(v)
          when Array
            v.map! {|el| encode_params(el) }
          else
            encode_params(v)
          end
        end
      end