@lanodan I think checking the size of that is probably reasonable for things like memory allocation, though I suspect that it's just a list of all the types in stdint. (And why they can't just use sizeof is a mystery. It is really obvious what's going on if you see `if(sizeof(size_t) == 8)`, and even trivial compilers remove the branch when compile-time constants are compared, but some preprocessor macro for _SIZE_OF_SIZE_T is at least an extra level of indirection, and it is practically guaranteed that they are using `#if` instead of just `if`.)