[DGD] Clonables versus Inheritables

[Par Winzell]

> Well, strictly speaking, you can't upgrade something that is only  
> inherited either.  :)  The kernel's rules prevent multiple compiled  
> versions of the same object from existing at the same time.  Any  
> inherited object can't be upgraded, so the master must be destroyed  and 
> re-created.  Both clones and daemon objects can be upgraded by  
> recompiling the master.  Because of this, the kernel blocks access to  
> inheritable objects for anything but inheriting them; that way you  can 
> always upgrade any real object (i.e., one you've got data in or  call 
> functions upon) by following the inherit path down from the auto  object.

Possibly helpful extract of all this advice: The kernel keeps pure 
programs pure so we feel safe destructing them at will -- they can 
always just be recompiled. Programs are pure when we know they can't 
have any state.

Zell