[swift-evolution] mandatory "?" suffix for identifiers associated with optional types

[Tyler Mandry]

I agree with Adrian here – the problem IMO is the fact that you can do `x <
5` *at all* if x is optional.

Allowing programmers to do `x? < 5` still doesn't make clear what the
actual result of the operation will be if x is nil. In fact, I would
actually *expect* the result of the operation to be a Bool?, not a Bool
which is always false if x is nil.

-- 
Tyler Mandry
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