[swift-evolution] [Idea] Use optionals for non-optional parameters

[Tino Heth]

> Let’s discuss something else. Actually there is an easy fix: make all functions accept optionals. I think this is a really bad idea
Indeed.
I don't think there is a good motivation to change the status quo:
You can't "sugar away" everything; sometimes, you just have to write a line of code that does what you want.
As you can "if let" convert as many optionals as you like in a single statement, it really doesn't hurt that much.

The precondition stuff looks exactly like guard inside the function to me… what's the benefit of that?
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