[swift-evolution] Proposal: Add "none" and simplify the language.

[Andrew Duncan]

> ----------------------------- <jackl at apple.com>
> 
> I’m not sure I see how “none”–or the bifurcation it creates–captures intent any more clearly than “nil".
> 
> Jack

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!

Andrew