[swift-users] Why will RawByte be deprecated in Swift 3?

[Marco Masser]

There’s a RawByte struct in the Swift 2.2 standard library:

/// A byte-sized thing that isn't designed to interoperate with
/// any other types; it makes a decent parameter to
/// `UnsafeMutablePointer<Memory>` when you just want to do bytewise
/// pointer arithmetic.
@available(*, deprecated, message="it will be removed in Swift 3")
public struct RawByte {
}

Why is that deprecated? On the current Swift master branch (22c4d7d) it’s still used in the String-related code and there’s also no mention about it being deprecated. Is there a replacement for RawByte? Should I just write my own version when I don’t want Int8 or UInt8 to mean “just a byte”?

Bonus question: Where does this deprecation come from? How can something be deprecated in the public Swift release when it’s not deprecated in the Swift source?

Cheers,

Marco
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