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@prefetcher

I worked in an internal language at EDS R&D that expanded from the two-valued Boolean space way beyond adding null. It had values, and definitions and actions for, ...

We haven't asked for (or gathered or collected) this data *yet*.

We don't know (and we have tried to find out).

Uninitialized / Not Set. (different from null)

.

(And several others that don't come to mind, right at the moment.)