[swift-evolution] Proposal: disallow nil in favor of .None

[Paul Young]

Please forgive me if this has already been discussed, but I couldn't find
reference to it anywhere.

My proposal is pretty simple – disallow the use of `nil` and require the
use of `.None` instead.

I would like to understand if there are any technical (or otherwise)
reasons for `nil` to remain, or if it simply a remnant of interop with
Objective-C.

Thanks,

Paul
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