deleting a class

I found that it's not possible to delete a class.
I suspect this is a precaution. But then it should
not be allowed to redefine a class either: 

? (delete myclass)

*** delete : Cannot delete this object : ::class:myclass
Debug toplevel [y/N] ?n
? (defclass myclass object
     whatever)
= myclass


A simple solution might be to let defclass lock the
class symbol.

Ralf



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