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Re: Fundamental design flaws



On Thu, Oct 30, 2003 at 09:05:04AM -0800, Tom Lord wrote:
> 
> Perhaps in all cases, the optional equivalence predicate to a
> constructor is mostly just a hint.
> 
> If I make a hash table using EQV? but then modify it with:
> 
> 	(dictionary-set! d k v)		; set using equal?
> 
> instead of
> 
> 	(dictionary-setv! d k v)	; set using eqv?
> 

> 
> then perhaps the results are simply undefined.   The non-generic
> interface to (normal) association lists works that way, for example.  
> I've certainly used hash-table libraries that work that way.

But why build in so much semantic uncertainty when the utility of 
changing equivalence in flight is limited to what I imagine are some 
pretty unusual cases?

	Scott

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