[swift-evolution] Remove Failable Initializers

[Brent Royal-Gordon]

> Error handling forces you to do something about the possibility of a failure.

So does using a failable initializer: the value is in an Optional, so you can't access it without either testing and unwrapping or just force-unwrapping. The type system, rather than the `try` requirement, is what forces you to handle the error, but it's the same idea.

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Brent Royal-Gordon
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