> static inline void *__UNCONST(const void *a) {
>     return ((const char *)a - (const char *)0) + (char *)0; }

Oh, now that is _elegant_.  Thank you very much; I've been looking for
a really good way to define a qualifier-stripper, and that is one of
those things that is unobvious until pointed out but so blindingly
obvious once pointed out that I can't understand how I missed it.

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