On Tue, 14 Oct 2025 at 23:39, Tom Honermann <tom_at_[hidden]> wrote:

> I would be very unhappy if any implementation made observe the default.
> But I find observe useful and see no reason to prohibit implementations
> from offering it.

Right. I do see such a reason, because the whole reason some of the
hardened implementations
were written to begin with is to guarantee that stdlib calls that
violate the hardened preconditions
aren't UB, ever.