class Addressable::URI

def host=(new_host)
  if new_host && !new_host.respond_to?(:to_str)
    raise TypeError, "Can't convert #{new_host.class} into String."
  end
  @host = new_host ? new_host.to_str : nil
  # Reset dependant values
  @authority = nil
  @normalized_host = nil
  @uri_string = nil
  @hash = nil
  # Ensure we haven't created an invalid URI
  validate()
end