[layer8]

The C standard doesn’t guarantee that arbitrary integer values converted to a pointer and back result in the same integer values again. It only guarantees the other direction, that a valid pointer to void, when converted to uintptr_t and back again, will result in a pointer that compares equal to the original. The conversion from uintptr_t to pointer may for example clear or truncate some of the bits of the integer value, or normalize it in some other way.

[alurm]

You're right, I added some more clarity in the README.

Interestingly, I think my approach will work fine on CHERI, since the pointer is never dereferenced, but I didn't test this. But yeah, there are some architectures where it would fail.