[swift-evolution] [Review] Add a Lazy flatMap for Sequences of Optionals

[Rob Mayoff]

>
> What's the advantage?  Why would we want to have a type that is isomorphic
> to Optional, except that conforms to CollectionType?
>

My question (apologies if it has been answered already) is: Why isn't
Optional a CollectionType, like it is in Scala?
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