    {
        return (0..<entryCount).reduce(description + ":") {
            "\($0)\n\(self.entryForIndex($1)?.description ?? "")"
        }
    }
    
    // MARK: - NSCopying
    
    open func copy(with zone: NSZone? = nil) -> Any 
    {
        let copy = type(of: self).init()
        