# File lib/http/cookie_jar.rb, line 231
  def save(writable, *options)
    opthash = {
      :format => :yaml,
      :session => false,
    }
    case options.size
    when 0
    when 1
      case options = options.first
      when Symbol
        opthash[:format] = options
      else
        if hash = Hash.try_convert(options)
          opthash.update(hash)
        end
      end
    when 2
      opthash[:format], options = options
      if hash = Hash.try_convert(options)
        opthash.update(hash)
      end
    else
      raise ArgumentError, 'wrong number of arguments (%d for 1-3)' % (1 + options.size)
    end

    saver = get_impl(AbstractSaver, opthash[:format], opthash)

    if writable.respond_to?(:write)
      saver.save(writable, self)
    else
      File.open(writable, 'w') { |io|
        saver.save(io, self)
      }
    end

    self
  end