Steven Schveighoffer: > Casting to immutable is the only way to create such a beast.
Then maybe we have to improve the language semantics to allow a better solution. See the Transients of Clojure or the larval objects of Java :-) The compiler may need to test (at compile time) that there's only one reference to the AA and its contents, and turn it into immutable. Bye, bearophile
