>  I note that this was needed in order to pass the is_class tests
>  because they expect is_class<SomeClass const>::value to be true.  We
>  don't have similar tests for is_enum.  
>  
>    a. Should we?  

Yes.
 
>    b. Regardless, is it documented somewhere that const-ness is
>       irrelevant to class-ness as far as the traits are concerned?
>       Obviously if a == yes, then we need the same for is_enum.

Not very well, I'll update the docs.

John.
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