> refactoring note - your class should not depend on return value, but
> rather on double-dispatch
> (allowing you to extend what can be dropped to GenericInputMorph even
> without touching it)
> so test for isNil is IMHO wrong way of doing it as well as need for<~
> special operator.

Everybody has his own style. I don't buy "best" coding practice. My 
coding is a personal craft, and while it is always evolving, it will 
never obey any specific guidelines. It's just not the way I do programming.

Best,

Stef