[swift-evolution] Make distinction between ?? -> T and ?? -> T?

[Sébastien Blondiau]

Currently, there is only one nil coalescing operator, which may return an optional value or not, depending on the second parameter. This variability can leads to unclear line of code:

var isItOptionalOrNot = value ?? otherValue

I think there should be two distinct operators:

var certainlyOptional = value ?? otherValue
var certainlyNotOptional = value ?! notOptionalValue

In my point of view, this differentiation brings more clarity about wether the result is an optional or not.

What's your opinion?

--
Sébastien Blondiau
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