[swift-evolution] Proposal: extend Optional-specific syntax to arbitrary types with CustomOptionalConvertible

[Matthew Johnson]

> Was it a part of your idea to allow the `PossibleValueType` to be used in Optional-only syntax constructs like conditional binding? If so, do you see any advantages of such solution over `CustomOptionalConvertible`?
> 

Yes that was the point of it.  

The biggest difference is probably avoiding the need to wrap the value in an Optional.  I'm not sure whether that would be a significant advantage or not but I believe it would avoid some copying and reference counting operations.

Matthew
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