decode_params (TMail::TextUtils)

    # File lib/action_mailer/vendor/tmail-1.1.0/tmail/utils.rb, line 217
        def decode_params( hash )
          new = Hash.new
          encoded = nil
          hash.each do |key, value|
            if m = /\*(?:(\d+)\*)?\z/.match(key)
              ((encoded ||= {})[m.pre_match] ||= [])[(m[1] || 0).to_i] = value
            else
              new[key] = to_kcode(value)
            end
          end
          if encoded
            encoded.each do |key, strings|
              new[key] = decode_RFC2231(strings.join(''))
            end
          end

          new
        end