[swift-evolution] Remove (!) logical negation operator

[Al Skipp]

> On 15 Dec 2015, at 18:14, Bruno Berisso via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
> > For example in `if let aBool = aBool where !aBool`, let's suppose that we know that `aBool` optional it's not empty before this check. How would you write it? `!aBool!` or with the `if let...` ?
> 
> if aBool == false {} covers this nicely. 
> 
> I think it will be `if aBool! == false {} ` to match the case in my previous example (not the !) (and note that I need to note the ! :) )

Don’t forget it’s perfectly fine to compare an Optional to a non-optional value with ==, the ! isn’t required and is potentially explosive.

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