text: - 
  types of strings
  Sun, 2011-12-18, 15:36
  hi,
  i regularly encounter situations where strings are used. for example it
  might be an url. or a resource key. or a string that is supposed to be
  sent to a brower and has to be escaped.
  and i regularly see errors caused by the fact that you cannot ask a
  string if it has already been resolved (if it's a resource key) or
  escaped, or if it is a relative or absolute url. if it even is one.
  in java, i try to make this a bit safer by creating simple wrappers like
  "class ResourceKey(val key:String)" to make sure i don't accidently mix
  them up. is there a way to achieve this in scala without wrapper
  classes? can i somehow (mis)use abstract types for this?
  basically i want to say :
  type AbsoluteUrl = ???
  def iAmAbsolutelySureThisIsAnAbsoluteUrl(url:String) =
  url.asInstanceOf[AbsoluteUrl]