class Addressable::URI

def self.join(*uris)
  uri_objects = uris.collect do |uri|
    unless uri.respond_to?(:to_str)
      raise TypeError, "Can't convert #{uri.class} into String."
    end
    uri.kind_of?(self) ? uri : self.parse(uri.to_str)
  end
  result = uri_objects.shift.dup
  uri_objects.each do |uri|
    result.join!(uri)
  end
  return result
end