switch on Class ?

[Brian Goetz]

>
>     I also have reason to believe that, if we do generalized patterns
>     property, we won't need to do this as a language feature, we can
>     do it as a library feature.  So, let's come back to this later. 
>
>
> Exhaustiveness is hard to emulate in a library.

Understood, but I would happily trade non-exhaustive, library-based 
switches on all kinds of non-constants for adding YET ANOTHER weird, 
bespoke, ad-hoc form of switch.  Or even the possibility of same in the 
future for another weird thing now.  (Anyway, this is a topic for later.)

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