class Addressable::URI

def normalized_scheme
  self.scheme && @normalized_scheme ||= (begin
    if self.scheme =~ /^\s*ssh\+svn\s*$/i
      "svn+ssh"
    else
      Addressable::URI.normalize_component(
        self.scheme.strip.downcase,
        Addressable::URI::CharacterClasses::SCHEME
      )
    end
  end)
end