class Addressable::URI

def user=(new_user)
  if new_user && !new_user.respond_to?(:to_str)
    raise TypeError, "Can't convert #{new_user.class} into String."
  end
  @user = new_user ? new_user.to_str : nil
  # You can't have a nil user with a non-nil password
  if password != nil
    @user = EMPTY_STR if @user.nil?
  end
  # Reset dependent values
  remove_instance_variable(:@userinfo) if defined?(@userinfo)
  remove_instance_variable(:@normalized_userinfo) if defined?(@normalized_userinfo)
  remove_instance_variable(:@authority) if defined?(@authority)
  remove_instance_variable(:@normalized_user) if defined?(@normalized_user)
  remove_composite_values
  # Ensure we haven't created an invalid URI
  validate()
end