Proposal: Add "none" and simplify the language.

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I’m not sure I see how “none”–or the bifurcation it creates–captures intent any more clearly than “nil".


Agreed. I think it just opens up the door to an infinite chain. Consider the distinction between “uninitialized” and “initialized to nil”. Let us call the uninitialized state “zil”. Now we need a term for “uninitialized to zil”. Look out!