How to use destroy and free.

[Alain De Vos]

> GC-allocated objects are run (when they are run). If you need 
> deterministic destruction e.g. for resource management, do not 
> use GC.

Descend destroy and free functions should return something.
"destroy" should return if the destructor was called successfully.
"free" should return the exact number of bytes freed on the heap.

Probably this is not implemented in the library because it is 
probably "buggy".