Colin Putney wrote:

(snipped parts that were answered by Nicolas and Igor)
> ...
> Note that #is: may work well in Cuis, but that's because Cuis is *not* a modular system.
>   

Of course it is not. Anyway, it is much closer to being modular than 
Squeak. At least there is a lot less dependencies in the kernel upon the 
applications. The removal of lots of #isXXX methods in Object is just a 
small part of that.

Cheers,
Juan Vuletich