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@sjb @tedu

so looks like `!p`
is equivalent to `(0 == p)`
and I'm guessing it casts the zero to the type of p?
But zero cast to a pointer type is a null pointer, and all null pointers are equal, so this should be fine?

But if you tried to cast a null pointer back to an integer, you might not get a zero (eg. on an arch that uses tagged pointers) ?

At least that's my read on this, but I haven't read the whole standard...