[Pharo-project] Immutable strings

Hello list! I would like to propose the compiler spit out immutable strings as string literals. I'd like to do this by making a subclass of classical strings which throws error messages when it is attempted to change the string. The beginning of this discussion happened in the bug tracker, please see http://code.google.com/p/pharo/issues/detail?id=1332. I completely agree with Toon: String literals should be immutable. This can be done with almost no speed impact and would only break code that quite honestly deserves to break. My 2 cents. Regards, Niko