[swift-evolution] Implicit truncation

[Martin R]

> On 24. May 2017, at 04:34, Xiaodi Wu via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Yes. First, the Foundation initializer converting from NSNumber has the same behavior:
> 
> ```
> import Foundation
> let x = Int(42.5 as NSNumber) // x == 42
> ```

As of SE-170 (which is implemented in Swift 4), the label "truncating" is also used for conversions which loose precision:

let x = Int(42.5 as NSNumber) // // warning: 'init' is deprecated
let y = Int(truncating: 42.5 as NSNumber) // 42
let z = Int(exactly: 42.5 as NSNumber) // nil

Regards ,Martin
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