How to make Strings work in a Uint8 raw value enum.

gistfile1.swift

extension UInt8 : StringLiteralConvertible {
    typealias ExtendedGraphemeClusterLiteralType = String
    typealias UnicodeScalarLiteralType = String
    
    public init(stringLiteral value: StringLiteralType){
        self.init(([UInt8]() + value.utf8)[0])
    }
    
    public init(extendedGraphemeClusterLiteral value: String){
        self.init(([UInt8]() + value.utf8)[0])
    }
    
    public init(unicodeScalarLiteral value: String){
        self.init(([UInt8]() + value.utf8)[0])
    }
}

enum Tag : UInt8 {
    case Byte = "B" // this works now!
    case Char = "C"
    case Double = "D"
}