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This is in response to mail under COERCE-FROM-TYPE and TYPE-OF. I would prefer
to constrain TYPE-OF to be at least as specific as (CLASS-NAME (CLASS-OF x)). 

I'm less sure what to do about instances of unnamed classes; the Medley way
would be to return the class itself for an otherwise nameless class. 

This would disallow what is otherwise "legal" now: namely to have TYPE-OF return
T for everything but structure instances. 

I think it probably is reasonable also to constrain TYPE-OF to be something that
SUBTYPEP can deal with. (cf SUBTYPEP-TOO-VAGUE). 

If I don't here any objections, I'll try to write this up when I get back that
far in the alphabet.

Meanwhile, I'll make a pass on COERCE-INCOMPLETE.