>
> Now...the question is, is there another free bit in the object header ? I
> need another one :(

Based on the comment at the bottom of Interpreter>>internalIsImmutable:
I suspect that somebody else has their eye on that last available bit
also ;-)

Yes, I know :( But for the moment I don't care to "integrate" my stuff. I just want to play and experiment. And even for that, I need 2 bits :(
Of course, if I once make something good to integrate, I will have double problem :(

So...no solution ?