How big is the stack? Too often large data will blow the top and destroy adjacent stacks in multi-thread environments. Are memory barrier fences used to check against overflow?

I think it is supposed to be stacks in the general sense of the data structure, not the literal `sp` register. I imagine they could be arbitrarily sized up to physical limits if you do some mmap magic. I'm still a bit fuzzy about how you could make useful programs with that, but it seems interesting.

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