Re: Some changes to autoconfiguration APIs

[Mouse <mouse%Rodents-Montreal.ORG@localhost>]

> Also, is there some way to distinguish an integer valued attribute
> which is explicitly set to 0 from one which isn't set at all

Not using the initialized-struct paradigm; there is no way to tell the
difference between
	(struct foo){...no mention of y...}
and
	(struct foo){y=0, ...no mention of y...}
because they compile to the same bits.

This is actually an advantage of the method I sketched upthread of
using no-op functions for type-checking with a varargs API function:
"not provided" can be handled differently from "provided" regardless of
the value provided.

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