[CM] Idea: using handles instead of pointers, s7_clone

[Elijah Stone]

On Sat, 24 Sep 2022, Christos Vagias wrote:

> I didn't get your comment of "limit the heap to 1b objects".

A handle is an int--that is 32 bits--and you want to steal 2 bits for tagging. 
2^30 is approximately a billion.