> > Why don't you think it (delayed construction of the hash 
> > table) should not be relied upon 
> > if all usable implementations do it, and an implementation 
> > that does not do it is hardly usable for the very kind of 
> > applications 'key' is designed for?
> > 
> 
> Implementors are permitted to produce lousy implementations of any
> feature in the spec. No spec can prevent that. Why is this feature any
> different from others?
> 

Because, opposite to many other features, this particular features is designed
as an optimisation hint, not as a transformation operation by itself. The only
thing it probably adds is the speed of execution. If it actually slows down operation
and eats memory, then I want to be warned, and I want the implementor to be warned
before I am.

David

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