 }
 
 @available(SwiftStdlib 5.7, *)
-extension Duration: Hashable { 
+extension Duration: Hashable {
   @available(SwiftStdlib 5.7, *)
   public func hash(into hasher: inout Hasher) {
     hasher.combine(_attoseconds)

  internal var _high: Int64

  @inlinable
  internal init(_low: UInt64, high: Int64) {
    self._low = _low
    self._high = high
  }

  internal init(_attoseconds: _Int128) {
    self.init(_low: _attoseconds.low, high: _attoseconds.high)
  }

  /// Construct a `Duration` by adding attoseconds to a seconds value.

}

@available(SwiftStdlib 5.7, *)
extension Duration: Codable {
  @available(SwiftStdlib 5.7, *)
  public init(from decoder: Decoder) throws {
    var container = try decoder.unkeyedContainer()
    let high = try container.decode(Int64.self)
    let low = try container.decode(UInt64.self)
    self.init(_high: high, low: low)
  }

  @available(SwiftStdlib 5.7, *)
  public func encode(to encoder: Encoder) throws {
    var container = encoder.unkeyedContainer()
