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let b:Character = "c"
extension Character {
    
    /* extension accessible as function */
    func asByteArray() -> [UInt8] {
        return String(self).utf8.map{UInt8($0)}
    }
    
    /* or, as @LeoDabus pointed out below (thanks!),
     use a computed property for this simple case  */
    var byteArray : [UInt8] {
        return String(self).utf8.map{UInt8($0)}
    }
}