> Don't we have a class-change prim now?  It used to require a #become:, 
> which would be very expensive.  But if we can just swizzle the class 
> pointer this could be a pretty decent approach.
> I should also say that Stef has a good paper about this kind of stuff 
> that I hope he'll post a link to.
:)

http://www.iam.unibe.ch/~scg/Archive/Papers/Duca99aMsgPassingControl.pdf
But take care what is described in the paper works for VW and some 
tricks do not work for Squeak.
In particular changeClass: is reallllllllyyyyyyy dangerous in Squeak 
(even with class having the same format we can crash an image in no 
time
I did not tried a lot but I could not have a code working with 
changeClass: involved.)

But the paper is worth reading.
Stef

>
> Avi
>
>