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And that is a huge improvement from the old 40 bit limit, and then the 42 bit limit. In fact it is over 1000x better than the 52 bit limit :-)

For garbage collectors and other things you really want a randomly selected number to only infrequently be a valid address.

How often do garbage collectors look at physical addresses?

... You're right, physical address bits are totally irrelevant and I was confused.

I'm guessing this is tradeoff of practical vs possible?