For context 1970 (or "now") is approximately 13.8 billion years after big bang.
If we want our unixtime in milliseconds that still 585 million years of coverage.
I still vote signed for that one.
@zatnosk When we approach roll over of the signed 64bit int, we can just start using the rolled over numbers for a ~while~ before we get actual ambiguity
@LovesTha "for a while" being approximately 20 times the current age of the universe.
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