* Mike Pall: > Florian Weimer wrote: >> From this, I infer that all valid userspace pointers on x86_64 are >> representable as lightuserdata values. > > Solaris also uses the negative x64 address space in user mode (for > stacks and default mmap). I have no plans to deal with this oddity. Wow. I didn't know this was even supported by the silicon.