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> Or steal another three bits from the bottom of the pointer...

Is all this dirtyness worth it? Compared also to the slowdown effects
for having to carry together bits?

Additionally, if Moores Law stays true, the 120TB Limit exposed by 48
bits (2^48) will be hit in 24 years*, and full 64 bits will be used.

log2(2^48 bits/ 2^32 bits) = 16 duplication
18 months for a duplication -> 24 years

I consider the self exposed 2GB limit is all but visionary. Yes, it is
a witty optimization now, but the next or the one after generation of
games will likely expect 4GB of memory eitherway.